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RMU-A Module BASICSFlow Monitor

Operating Instructions

Series RMU-AType RMU-A11 thru RMU-A15

Read the instructions prior to performing any task!

RMU-A Module BASICS, 1, en_US

© Meister Strömungstechnik GmbH 2014

Meister Strömungstechnik GmbH

Im Gewerbegebiet 2

63831 Wiesen

Germany

Telephone: +49 6096 9720 - 0

Fax: +49 6096 9720 - 30

Email: [email protected]

Internet: www.meister-flow.com

These instructions were compiled by:

Meister Strömungstechnik GmbH

Subject to change without notice

07.09.2015RMU-A Module BASICS Flow Monitor2

These instructions facilitate the safeand efficient handling of a flow monitor(referred to as "device" in the fol-lowing). The instructions are an inte-gral part of the device and must bekept within easy reach for the per-sonnel in the immediate vicinity of thedevice at all times. Personnel mustcarefully read and understand theseinstructions before commencing allwork. The basic requirement for safework is adherence to all safety andhandling instructions stipulated inthese instructions. The local accident-prevention regulations and generalsafety standards and regulations forthe field of application of the devicealso apply. Illustrations in theseinstructions are provided to aid generalunderstanding and might deviate fromthe actual model. No claims can bederived from any such differences.

Limitations of liability

All details and instructions in thismanual have been compiled underconsideration of the valid standardsand regulations, the current state-of-technology and our many years ofknowledge and experience. The manu-facturer does not accept any liabilityarising from:

n non-observance of any details inthese instructions

n improper use of the device, or usethat is not in accordance withthese instructions

n use of non-trained personnel

n unauthorized retrofitting or tech-nical changes that have not beenauthorized by the manufacturer

n use of non-approved spare parts

The duties and obligations agreedupon in the delivery contract apply infull, as well as the general terms andconditions, the terms of delivery by themanufacturer and the valid legal regu-lations applicable at the conclusion ofthe contract.

Copyright

These operating instructions are pro-tected by copyright.

Except for internal purposes, transferof these instructions to third-parties,copying them in any way– even in part – as well as dissemina-tion and/or communication of their con-tent is forbidden without prior writtenauthorization from Meister Strömung-stechnik ("manufacturer"). Violationsare subject to claims for indemnifica-tion. The manufacturer reserves theright to assert additional claims.

Copyright is the property of the manu-facturer.

© Meister Strömungstechnik GmbH

Im Gewerbegebiet 2

63831 Wiesen

Germany

Supplemental instructions

07.09.2015 RMU-A Module BASICS Flow Monitor 3

Table of contents1 Overview...................................................................................................... 7

1.1 Short description.................................................................................. 71.2 Warranty and guarantee provisions..................................................... 71.3 Customer service................................................................................. 7

2 Safety........................................................................................................... 82.1 Explanation of symbols........................................................................ 82.2 Correct use in accordance with these instructions............................. 102.3 Special precautions............................................................................ 102.3.1 Hazards from electrical current....................................................... 112.3.2 Mechanical hazards........................................................................ 122.3.3 Hazards from high or low temperatures.......................................... 132.3.4 Radiation hazards........................................................................... 132.3.5 Hazards caused by media............................................................... 142.4 Personnel requirements..................................................................... 142.5 Personal safety equipment................................................................. 152.6 Protective systems............................................................................. 162.7 Replacement parts............................................................................. 162.8 Environmental protection................................................................... 172.9 Responsibility of the owner................................................................ 17

3 Design and function................................................................................. 203.1 Overview............................................................................................ 203.2 Device description.............................................................................. 203.3 Component description...................................................................... 21

4 Transport, packaging and storage.......................................................... 224.1 Safety instructions for transport......................................................... 224.2 Transport inspection........................................................................... 224.3 Packaging.......................................................................................... 224.4 Symbols on the shipping box............................................................. 234.5 Storage............................................................................................... 23

5 Installation and initial startup.................................................................. 255.1 Safety................................................................................................. 25

Table of contents


5.2 Requirements at the place of installation........................................... 255.3 Preparatory work................................................................................ 265.4 Installation in the pipe line.................................................................. 305.5 Initial startup....................................................................................... 345.6 Electrical connection.......................................................................... 355.6.1 Plug connector DIN 43650.............................................................. 355.6.2 Plug connector M12x1.................................................................... 355.6.3 Cable............................................................................................... 365.6.4 Degree of protection (IP-Code)....................................................... 365.7 Grounding the device......................................................................... 365.8 Plug connection.................................................................................. 365.9 Contact protection measures............................................................. 36

6 Operation................................................................................................... 386.1 Setting the switch point...................................................................... 386.2 Checking the flow............................................................................... 40

7 Troubleshooting....................................................................................... 417.1 Safety................................................................................................. 417.2 Troubleshooting guide........................................................................ 43

8 Maintenance.............................................................................................. 458.1 Safety................................................................................................. 458.2 Maintenance plan............................................................................... 458.3 Removal from the pipe system........................................................... 468.4 Disassembly....................................................................................... 478.5 Maintenance....................................................................................... 508.5.1 Cleaning.......................................................................................... 508.5.2 Parts replacement........................................................................... 528.5.3 Assembly......................................................................................... 528.5.4 Switch contact replacement............................................................ 558.6 Measures to be taken after maintenance work.................................. 56

9 Disassembly and disposal....................................................................... 579.1 Safety................................................................................................. 579.2 Disassembly....................................................................................... 57

Table of contents


9.3 Return Materials................................................................................. 589.3.1 Return Materials Authorization........................................................ 589.4 Disposal............................................................................................. 58

10 Technical data........................................................................................... 5910.1 Device data plate............................................................................. 5910.2 Switch contact data plate................................................................. 5910.3 Dimension sheet.............................................................................. 6010.4 General specifications...................................................................... 6110.5 Electrical specifications.................................................................... 6110.6 Measuring ranges............................................................................ 6210.6.1 Standard measuring ranges.......................................................... 6210.7 Operating data................................................................................. 62

11 Appendix................................................................................................... 6311.1 Tightening torque............................................................................. 6311.2 Replacement parts........................................................................... 6311.3 Tools................................................................................................ 6511.4 Sealant............................................................................................. 6511.5 Lubricants......................................................................................... 66

12 Index.......................................................................................................... 67

Table of contents


1 Overview1.1 Short description

Fig. 1: RMU-A flow monitor

1 Switch point adjustment scale2 Switch contact with connection

cable

The flow monitor RMU-A monitors thecontinuous flow of liquids. It isdesigned for installation in pipe sys-tems.

A float inside the device is moved bythe medium flowing through it. Thedesired switch point can be set on theswitch point adjustment scale, wherebythe arrow on the switch contact isaligned to the desired volume flowvalue on the switch point adjustmentscale.

The cable can be connected toexternal measuring devices.

1.2 Warranty and guar-antee provisions

Warranty and guarantee provisions arecontained in the general terms andconditions of the manufacturer.

1.3 Customer serviceFor technical information, please con-tact our customer service department(for contact details, see Page 2).

Furthermore, our staff is always inter-ested in receiving new information andexperiences gained from application ofthe device, which might be useful inimproving our products.

OverviewCustomer service


2 SafetyThis chapter provides an overview ofimportant safety aspects required foroptimum protection of personnel aswell as for safe installation and safeoperation of the device.

Non-observance of the handling andsafety instructions listed in this manualmay result in hazardous/dangerous sit-uations and in damage to property.

2.1 Explanation of sym-bols

Safety instructions

Safety instructions in this manual aremarked by symbols. The safety instruc-tions are preceded by signal words thatindicate the level of danger/hazard.

To prevent accidents or injuries to per-sons as well as damage to property,always observe the safety instructionsand proceed carefully.

DANGER!

This combination of symbol andsignal word indicates an imme-diate, dangerous situation thatresults in death or serious injuriesif it is not avoided.

WARNING!

This combination of symbol andsignal word indicates a possiblydangerous situation that mightresult in death or serious injury if itis not avoided.

SafetyExplanation of symbols


CAUTION!

This combination of symbol andsignal word indicates a possiblydangerous situation that mightresult in minor or slight injuries if itis not avoided.

NOTICE!

This combination of symbol andsignal word indicates a possiblydangerous situation that mightresult in damage to property and tothe environment if it is not avoided.

Tips and recommendations

This symbol emphasizes usefultips and recommendations as wellas information for efficient andfailure-free operation.

Signs used in these instructions

The following signs and highlightingare used in these instructions to iden-tify handling instructions, the descrip-tion of results, lists/enumerations, ref-erences and other elements:

Designates step-by-step han-dling instructions

ð Designates a state or anautomatic sequence as aresult of a specific operatingstep

n Designates randomly ordered enu-merations and list entries

Ä “Signs used in these instructions”on page 9, designates references tochapters in these instructions

SafetyExplanation of symbols


2.2 Correct use inaccordance withthese instructions

The device is designed and con-structed exclusively for the intendeduse described herein.

Correct use in non-hazard areas

The flow monitor serves exclusivelyto monitor the continuous flow of liq-uids within a temperature range of-20 °C to 120 °C (optional: 160 °C) ata maximum operating pressure of250 bar (brass version).

Correct use in explosion-hazardzones

Explosion-proof switch contacts arecurrently not available for the RMU-Aseries flow monitor.

Any additional or different application,above and beyond the correct use inaccordance with these instructions, isdeemed as incorrect use.

WARNING!

Danger due to incorrect use!Incorrect use of the flow monitormay result in dangerous condi-tions.

– Use the flow monitor onlywithin the stipulated perform-ance limits

– Do not subject the flow mon-itor to severe temperature fluc-tuations

– Do not use the flow monitorwith quick acting valves

– Do not use the flow monitorwith solenoid valves

– Do not subject the flow mon-itor to vibrations

– Do not subject the flow mon-itor to pressure surges

– Do not use the flow monitorwith media containing solids orabrasives

– Use the flow monitor only withmedia previously approved bythe manufacturer

– Do not use the flow monitor asthe sole monitoring device toprevent dangerous conditions

– Do not install the flow monitoras a supporting part within apipeline system

– The flow monitor must beinstalled so that it is protectedfrom damage by mechanicalforce. If necessary, install anappropriate impact protectiondevice.

All claims for damages due to incorrectuse are excluded.

2.3 Special precautionsThe following section lists residualrisks that might arise from the device.

SafetySpecial precautions


To reduce health risks and preventdangerous conditions, observe thesafety instructions listed here as wellas the safety instruction in the otherchapters of these Operating Instruc-tions.

DANGER!

RMU-A devices are not suitablefor employment in explosionhazard zones.

These Operating Instructionscannot cover all conceivable dan-gers because many dangers arise,not from the device itself, but fromthe respective media flowingthrough it. Always observe theappropriate safety data sheetswhen using hazardous media!

2.3.1 Hazards from elec-trical current

Electrical current

DANGER!

Danger to life from electricalcurrent!There is an immediate risk to lifefrom electrocution on touching liveparts. Damaged electrical insula-tion or components can beextremely dangerous.

– Only qualified electriciansshall work on the electricalsystem.

– If the insulation is damagedthen immediately switch offand have repairs carried out.

– Before commencing work onlive parts of the electrical sys-tems and operating equip-ment, disconnect the equip-ment and ensure that itremains disconnected for theduration of the work. Observethese 5 safety rules whendoing so:– Isolate (disconnect)– Secure against switching

back on– Check for absence of

voltage– Ground and short– Cover or cordon off other

live parts in the vicinity

SafetySpecial precautions > Hazards from electrical current


– Never bridge fuses or putthem out of operation. Alwaysobserve the correct currentratings when replacing fuses

– Keep moisture away from liveparts. This can result in short-circuit

2.3.2 Mechanical hazards

WARNING!

Risk of injury due to fracturedhousing and leakage!Unauthorized temperatures orexcessive pressure may cause theflow monitor body or the processconnections to burst. Injuries maybe caused by flying debris andescaping media.

– Keep within the stipulatedoperating conditions

– Wear personal protectiveequipment

– Avoid severe temperature fluc-tuations

– Avoid pressure surges

CAUTION!

Risk of injury on sharp edgesand pointed corners!Sharp edges and pointed cornerscan cause abrasions and skincuts.

– Proceed with caution whenworking near sharp edges andpointed corners

– If in doubt, wear protectivegloves

SafetySpecial precautions > Mechanical hazards


2.3.3 Hazards from highor low temperatures

Hot or cold surfaces

WARNING!

Risk of injury from hot or coldsurfaces!Surfaces of components may heatup/cool down dramatically due tothe media flowing through them.Skin contact with hot or cold sur-faces causes severe skin burning/freezing.

– Always wear temperature-resistant protective workclothing and protective gloveswhen working near hot/coldsurfaces

– Before commencing any work,make sure that all surfaceshave been cooled down orwarmed up to ambient temper-ature

2.3.4 Radiation hazardsStrong magnetic fields

WARNING!

Danger to life from strong mag-netic fields!Strong magnetic fields may causesevere injuries or even be fatal, aswell as cause considerabledamage to property.

– Persons with pacemakersmust not be located in thevicinity of the device. Thiscould impair the function of thepacemaker

– Persons with metal implantsmust not be located in thevicinity of the device. Implantscan heat up or be attractedmagnetically

– Keep ferromagnetic materialsand electromagnets awayfrom the magnetic source.These materials could beattracted and fly through theroom, thereby injuring or evenkilling persons. Minimumclearance: 3 m

– Remove and put away metalobjects before maintenancework (jewelry, watches, writingimplements, etc.)

– Do not place any electronicdevices within the vicinity ofthe magnetic source. Thesecould be damaged

SafetySpecial precautions > Radiation hazards


– Do not place any electronicstorage media, credit cards,etc. within the vicinity of themagnetic source. Data couldbe deleted

2.3.5 Hazards caused bymedia

Hazardous media

WARNING!

Risk of injury from hazardousmedia!If the flow monitor is used for toxic,corrosive or very hot/cold mediathen there is a risk of serious injuryif the media escapes.

– Observe details in the safetydata sheet of the media

– Comply with the safety, acci-dent prevention and environ-mental protection regulationsappropriate to the media used

– Wear personal protectiveequipment in accordance withthe safety data sheet

2.4 Personnel require-ments

WARNING!

Risk of injury due to insuffi-ciently trained and qualified per-sonnel!If unqualified personnel work onthe device or are located within itshazard zone, dangers arise whichmay result in serious injuries andconsiderable damage to property.

– All work must be performed byqualified personnel only.

– Keep unqualified personnelaway from hazard zones.

Authorized personnel is to be restrictedto those persons who can be expectedto carry out their work reliably. Personswhose ability to respond is influenced,e.g. by drugs, alcohol or medication,are not authorized.

Observe the age and occupational reg-ulations at the site when choosing per-sonnel.

SafetyPersonnel requirements


The following lists the personnel quali-fications for the various areas ofactivity:

Qualified electricianDue to specialized training, knowledgeand experience as well as knowledgeof the relevant standards and regula-tions, the qualified electrician is able toindependently perform work on theelectrical systems as well as to detectand avoid possible risks and dangers.

Additionally, the electrician must pro-vide proof of his/her professional quali-fication that certifies his/her ability toperform work on electrical systems.

The qualified electrician must fulfill therequirements contained in the validlegal accident-prevention regulations.

Qualified personnelDue to their specialized training, knowl-edge and experience as well as theirknowledge of the relevant standardsand regulations, qualified personnelare able to independently carry out thework assigned to them as well as todetect and avoid possible risks anddangers.

2.5 Personal safetyequipment

Personal safety equipment is used toprotect personnel from hazards/dan-gers that might impair their safety orhealth during work.

When performing the various tasks at,and with the device, personnel mustwear personal safety equipment. Spe-cial reference is made of this in theindividual chapters within these Oper-ating Instructions. The following pro-vides a description of the personalsafety equipment:

n Always wear appropriate personalsafety equipment required in thevarious chapters of these Oper-ating Instructions before com-mencing work.

n Comply with the personal safetyequipment instructions postedwithin the work area.

Description of personal safetyequipment

Goggles

The goggles are used to protect theeyes from flying debris and splashingfluid.

Protective gloves

SafetyPersonal safety equipment


Protective gloves protect the handsfrom friction, burns, grazing, abrasion,surface cuts or deeper injuries, as wellas from direct contact with hot or coldsurfaces.

With hazardous media, the protec-tive equipment specified in theSafety Data Sheet of the mediummust be worn. In addition, the speci-fications of the system operatormust be followed. If no protectiveequipment is specified, suitable pro-tective gloves and goggles must beworn.The protective equipment is used toprotect against hazardous media leaksand hazardous media residue in thedevice.

2.6 Protective systemsIntegration within an emergency-stop concept is required

The device is designed for use as apart of a machine or system. It doesnot have its own controller and doesnot have an autonomous emergency-stop function.

Before starting up the device, installthe emergency-stop equipment andincorporate it into the safety chain ofthe machine or system.

Connect the emergency-stop equip-ment so that if there is an interruptionin the power supply or in the activationof the power supply after an interrup-tion, dangerous conditions areexcluded for persons and valuables.

The emergency-stop equipment mustalways be freely accessible.

2.7 Replacement parts

WARNING!

Risk of injury due to use ofincorrect replacement parts!Use of incorrect or faulty replace-ment parts may result in dangersto personnel as well as damages,malfunctions or total failure.

– Only use original replacementparts from the manufacturer orapproved by the manufacturer.

– Always contact the manufac-turer in case of doubt.

SafetyReplacement parts


Always purchase replacement partsfrom an authorized dealer or directlyfrom the manufacturer (For contactdetails, see Page 2).

The replacement parts list is in theannex.

2.8 Environmental pro-tection

NOTICE!

Risk to the environment due toimproper handling of environ-mentally hazardous substances!Serious environmental damagecan result if substances harmful tothe environment are handled incor-rectly, especially if they are dis-posed of improperly.

– Always observe the instruc-tions listed below on the han-dling and disposal of sub-stances harmful to theenvironment.

– If harmful substances arereleased into the environment,take immediate countermeas-ures. If there is doubt, contactthe local authorities, informthem of the damage andrequest information on suit-able countermeasures to betaken.

Cleaning fluids

Solvent-based cleaning fluids containtoxic substances. They must never bereleased into the environment andmust be disposed of by a waste man-agement company.

Lubricants

Lubricants such as greases and oilscontain toxic substances. They mustnever be released into the environmentand must be disposed of by a wastemanagement company.

2.9 Responsibility of theowner

Owner

The owner is the person who operatesthe device himself for business or com-mercial purposes or who cedes suchuse/application to a third-party andwho, during operation of the device,has full legal product stewardship forprotection of the user, the personnel orthird-parties.

Duties of the owner

The device is used in the commercialsector. The owner of the device istherefore subject to legal obligationspertaining to work safety.

SafetyResponsibility of the owner


In addition to the safety instructionscontained in these Operating Instruc-tions, the safety, accident preventionand environmental protection regula-tions applicable to the field of applica-tion of the device must be observed.

In particular, this includes:

n The owner must inform himselfregarding the valid health andsafety regulations and must carryout a risk assessment to addition-ally determine the risks resultingfrom the special work conditionsarising at the location at which thedevice is used, especially in regardto the media used. He must thenimplement these within OperatingInstructions for use of the device.

n The "Occupational Health andSafety Act" of 1970 stipulates thatit is the duty of the owner to pro-vide a safe workplace. He musthereby ensure that the device isoperated and maintained com-pliant to valid commercial, indus-trial, local, federal and state laws,standards and regulations.

n Appropriate to the working condi-tions and the media used, theowner must affix signs within theworking area that inform the userof the hazards and dangerspresent.

n During the entire period of use ofthe device, the owner must checkperiodically to ensure that theOperating Instructions correspondto the current state of regulations,and he must make adjustments asnecessary.

n The owner must clearly regulateand determine responsibilities forinstallation, operation, trouble-shooting, maintenance andcleaning.

n The owner must fit/retrofit suitablesafety equipment within the com-plete plant/system.

n The owner must ensure that allstaff/personnel have thoroughlyread and understand these instruc-tions before handling the device.Additionally, he must train the per-sonnel at regular intervals andwarn them of dangers.

n The owner must provide the per-sonnel with the required safetyequipment and must instruct themthat its wear is mandatory.

Additionally, the owner is responsiblefor ensuring that the device is alwayskept in a technically perfect condition.The following therefore applies:

n The owner must implement suit-able safety measures, appropriateto the media used.

n Different media have differentseverities of influence on thesoiling and wear of/to the device.The owner must set suitable main-tenance intervals, depending onthe media flowing through thedevice.



n The owner must ensure that themaintenance intervals described inthese Operating Instructions areadhered to at all times.

n The owner must ensure that thedevice is completely free of allresidual media before disposal.Remains of corrosive or toxicmaterials must be neutralized.



3 Design and function3.1 Overview

Fig. 2: Overview

1 Device body2 Switch contact with cable3 Switch point adjustment scale

3.2 Device descriptionRMU-A flow monitors work accordingto the functional principle of the vari-able area flow meter. The flow monitoris installed into a pipe line system andmeasures the flow rate of the mediumflowing through the pipe line.

A float inside the flow monitor is movedby the flowing medium. A magneticfield is generated by the magnetsinside the float. The position of the floatis detected by a switch contact. Thedesired switch point can be set on theswitch point adjustment scale bymoving the switch contact.

Applications for RMU-A flow monitorsare, for example, cooling circuits. Thedevice monitors the volume flow of thecooling media to ensure sufficientcooling. If the flow drops below thethreshold set by the operator, theswitch contact opens (Normally OpenContact).

Design and functionDevice description


3.3 Component descrip-tion

Switch contact

Fig. 3: Switch contact with connectioncable

A potential-free Reed contact is castinto the switch contact ( Fig. 3/1). Thedevice is supplied with a connectioncable.

Switch point adjustment scale

Fig. 4: Switch point adjustment scale

A scale is applied to the device body,to which the desired switch point canbe adjusted.

Design and functionComponent description


4 Transport, packaging and storage4.1 Safety instructions

for transport

Improper transport

NOTICE!

The device could be damaged iftransported improperly!Objects to be transported may fallor overturn if transported incor-rectly. This can result in damage tothe device and/or property.

– Proceed carefully whenunloading transported pack-ages, both on delivery andwhen transporting in-house.Observe the symbols andinstructions on the shippingbox

– Only remove packaging imme-diately before assembly

4.2 Transport inspec-tion

On delivery, make an immediate checkfor completeness and check for trans-port damages.

If there are any visible external trans-port damages then proceed as follows:

n Do not accept the deliveryn Note the damage in the shipping

documents or on the delivery noteof the transporter and have thedriver confirm by signature

n Initiate a claim for damages

Make a claim for each fault assoon as it is detected. Claims fordamages can only be invokedwithin the valid claim periods.

4.3 PackagingAbout packaging

The packaging serves to protect theindividual components from transportdamages, corrosion and other dam-ages until they are installed. Do notdiscard the packaging and only removethe device from the shipping boximmediately before installation.

Transport, packaging and storagePackaging


Handling packaging materials

Dispose of packaging material inaccordance with the valid legal regula-tions and local ordinances.

NOTICE!

Danger to the environment dueto incorrect disposal!Packaging is made of valuable rawmaterials and can be reused inmany cases or usefully processedand recycled. Improper disposal ofpackaging materials may pose adanger to the environment.

– Dispose of packaging materialin an environmentally safemanner

– Comply with the local disposalregulations. If necessary, havethe packaging disposed of byapproved specialists.

4.4 Symbols on theshipping box

Top

The arrowheads indicate the top sideof the package. They must alwayspoint upwards, otherwise the contentmay be damaged.

Fragile

Designates packages with breakableor damageable contents.

Handle the package carefully and donot allow it to fall or be subjected to jar-ring or severe vibration.

4.5 StorageStoring the packages

Store the packages under the followingconditions:

n Do not store in the openn Store dry and dust-freen Do not subject to any aggressive

median Protect from direct sunlightn Avoid mechanical vibrations and

shocksn Storage temperature: 0 to 35 °Cn Relative humidity: max. 60 %n Do not stackn If storing for longer than 3 months,

regularly check the general condi-tion of all parts as well as of thepackaging.

Transport, packaging and storageStorage


Storage instructions in addition tothe instructions listed here may belisted on the packages. Followthese instructions also.

Transport, packaging and storageStorage


5 Installation and initial startup5.1 SafetyIncorrect installation and initialstartup

WARNING!

Risk of injury due to incorrectinstallation and initial startup!Incorrect installation and initialstartup may result in severe inju-ries and considerable damage toproperty.

– Ensure that the site is suffi-ciently cleared of obstructionsbefore commencing work

– Handle open or sharp edgedcomponents carefully

– Ensure that the assemblylocation is orderly and clean!Parts and tools lying about oron top of each other arepotential causes of accidents

– Assemble components prop-erly. Observe the stipulatedtightening torque of screws

– Before initial startup, makesure that all installation workhas been carried out and com-pleted in compliance with thespecifications and instructionsin these Operating Instructions

Safeguard against restart

WARNING!

Danger to life due to unauthor-ized restart!There is a risk of severe or evenfatal injuries from unauthorizedrestart of the power supply duringinstallation.

– Before commencing work,switch off the power supply tothe entire system/plant andsecure against restart

5.2 Requirements at theplace of installation

The place of installation must meet thefollowing requirements

n The device must not be underwater.

n The surrounding area must be suf-ficiently illuminated.

n There must be sufficient space toprevent accumulation of trappedheat.

n The device must not be installedas a supporting part in a pipe con-struction.

n The device may not have anythingaffixed to, or suspended from it.

Installation and initial startupRequirements at the place of installation


n The flow monitor must be installedin such a way as to precludedamage by outside force. It mustbe ensured that the flow monitorcannot be damaged. If necessary,install an appropriate impact pro-tection device.

n External magnetic fields will influ-ence the switch contact. Keep suf-ficient distance to magnetic fields(e.g. electric motors).

n Piping, process connections orsupports made from ferromagneticmaterial influence the magneticfield of the device. Keep a spaceof minimum 100mm to those mate-rials (e.g. steel).

5.3 Preparatory workThe following requirements must bemet during installation to ensure cor-rect functioning of the flow monitor:

WARNING!

Danger due to incorrect installa-tion!If the requirements are not metwhen installing the flow monitor,dangerous/hazardous conditionsmay arise.

– Do not install the flow monitoras a supporting part in a pipesystem

– Do not use the flow monitorwith quick-acting valves

– Do not use the flow monitorwith solenoid valves

Installation position/direction offlow

Fig. 5: Installation position/direction offlow

Install the flow monitor only in one ofthe positions displayed in the drawing.The medium must flow in the directionof the arrow (from a low to a high scalevalue).

Installation and initial startupPreparatory work


Unimpeded flow sections

NOTICE!

Measuring inaccuracy due toincorrect installation!The measuring accuracy of theflow monitor is influenced by itsposition within the pipe system.Changes in cross-section, branch-offs or bends in the pipe linesystem impair measuring accu-racy.

– Ensure that the unimpededflow sections are maintained

– Never reduce the hose diam-eter immediately before thedevice

We recommend unimpeded flowsections, type BS-228. Fig. 6: Unimpeded flow sections

1 10x DN2 5x DN

n An unimpeded flow section of10xDN (rated width) must be main-tained before the device.

n An unimpeded flow section of5xDN (rated width) must be main-tained after the device.



Unimpeded outlet

Fig. 7: Unimpeded outlet

If the pipe line ends at an unimpededoutlet, the flow monitor must not beinstalled directly in front of the opening.The device must always be completelyfilled with media to ensure measuringaccuracy.

Strainer



Fig. 8: Strainer

1 min. 10x DN2 min. 5x DN

If the medium is contaminated bysolids, a strainer must be installedbefore the device ( Fig. 8).

We recommend a Type SF, SFDor SFM strainer.

Prepare the device

NOTICE!

Risk of damage to property dueto contamination!Contamination and deposits mayimpair the free movement of thefloat, thereby damaging thedevice.

– Ensure that there are no for-eign particles in the device

– Ensure that the device is notsoiled

– Do not use any medium con-taining solids

Due to quality assurance meas-ures, there may be some testmedium (water) residue in thedevice.



1. Unpack the device and visuallyinspect the device to ensure thatit is free of packaging materials

2. Examine the device for residueof test medium and drain, if nec-essary

3. Check the device for soiling andflush with clean medium, if nec-essary

5.4 Installation in thepipe line

WARNING!

Risk of injury from pressurizedlines!If the pipe system is under pres-sure when installing the device,severe injuries may result.

– Depressurize the pipe systembefore installing the device

WARNING!

Risk of injury from hot or coldsurfaces!Pipe lines can heat up/cool downdramatically due to the mediaflowing through them. Skin contactwith hot or cold surfaces maycause severe skin burn or frostbite.

– Before commencing work,ensure that the system hasbeen controlled to a tempera-ture range between 0 and 40°C

– Do not touch any parts of thesystem that are either very hotor very cold.

– Always wear heat-resistant/cold-resistant protectiveclothing and protective gloveswhen working near hot/coldsurfaces.

Installation and initial startupInstallation in the pipe line


WARNING!

Risk of injury from media in thepipe system!If the pipe system contains haz-ardous media, severe injuries maybe caused by escaping media.

– Before installation, ensure thatthe pipe system is empty anddoes not contain media res-idue

– Always wear personal protec-tive equipment during installa-tion

– Provide suitable drainingdevices (collection tanks, etc.)

NOTICE!

Risk of damage to the devicedue to contamination in the pipeline system!Dirt and foreign particles enteringthe device can damage the deviceand impair its operation.

– Ensure that the pipe system isclean before installing thedevice

– If necessary, flush the pipesystem with clean mediumbefore installation

A suitable sealant must beselected depending on the condi-tion/composition of the hose lines,the medium and the operating andenvironmental conditions. Thesealing method described here isonly an example and cannot beused in all cases.



Sealing the pipe connection

Personnel:n Qualified personnel

1. Nap the thread

Fig. 9: Apply sealing thread

2. Apply sealing thread ( Fig. 9/1)to the napped area in thethreaded direction. Observe thequantity recommended by thesealant manufacturer.

Fig. 10: Pipe connection with sealingthread

ð The pipe line is now readyfor assembly ( Fig. 10)



Install device in the pipe system


Protective equipment:n Protective gloves

Tools:n Fixed spanner

CAUTION!

Do not hold the device by itsthreads. These are sharp edgedand may cause injury

1. Place the threaded end of thedevice onto the thread of theconnecting pipe

Fig. 11: Screw in the device

2. Fasten the adapter union of thepipe line with an appropriatespanner ( Fig. 11/2). Whendoing so, lock the process con-nection of the device in place toprevent slip, using a suitablespanner ( Fig. 11/1).

Fig. 12: Screw in the device

3. Keep turning in the adapterunion ( Fig. 12/2) while holdingthe process connection of thedevice locked ( Fig. 12/1) untilthe connection is tight.

4. Repeat these steps at the otherend of the device.



5.5 Initial startupThe following steps must be takenbefore initial startup and any subse-quent startup (e.g. after removal andinstallation during maintenance).

1.

WARNING!

Make sure that the plant isoperating vibration-free.Vibrations could destroy thedevice. This could result in aserious risk of injury to theuser.

2.

WARNING!

Make sure that the mediumis flowing continuously.Pulse-like staggered loadscould destroy the device.This could result in a seriousrisk of injury to the user.

3.

NOTICE!

Completely fill the pipe lines.Partial filling(s) may result inmalfunctions and damage tothe device.

4.

NOTICE!

Vent the pipe line. If thereare air bubbles in the lineduring the measurementthen this could result indamage to the devicecaused by hydraulic shock.This could result in malfunc-tions.

5.

NOTICE!

Make sure that the plant isoperating without cavitation.Cavitation may result in mal-functions and damage to thedevice.

Installation and initial startupInitial startup


5.6 Electrical connec-tion

The electrical connection of the flowmonitor is accomplished through thecast on power cable. The switch con-tacts employed in these devices arepotential free and do not require apower source. Switch contact and flowmonitor have been optimally harmon-ized. After replacement of a switchcontact, the switch point must be read-justed.

DANGER!

Danger to life from electricalcurrent!There is an immediate risk of lifefrom electrocution on touching liveparts. Damage to the electricalinsulation or single componentscan be extremely dangerous.

– Only qualified electriciansshall work on the electricalsystem

– If the insulation is damagedthen immediately switch offand have repairs carried out

– Before commencing work onlive parts of electrical systemsand components, disconnectsthe equipment and ensure thatit remains disconnected for theduration of the work. Observethese 5 rules when doing so:– Isolate (disconnect)– secure against switching

back on

– Check for absence ofvoltage

– Ground and short– Cover or cordon off other

live parts in the vicinity– Never bridge fuses or put

them out of operation. Alwaysobserve the correct currentratings when replacing fuses

– Keep moisture away from liveparts. This can result in shortcircuit

5.6.1 Plug connector DIN43650

Not available for this device series

5.6.2 Plug connectorM12x1

Not available for this device series

Installation and initial startupElectrical connection > Plug connector M12x1


5.6.3 CableThe individual cores of the cable arenumbered according to the followingconnection diagram.

Wiring diagram

normally open:

Fig. 13: Switch position under no-flowcondition

5.6.4 Degree of protection(IP-Code)

The specified degree of protection (IP)is only ensured if approved connectionmaterial is used (see following table).

Deviceconnec-tion

Specifica-tion ofconnec-tion mate-rial

Degree ofprotection

Cable - IP67

5.7 Grounding thedevice

When installing the device in a pipesystem, ensure that the device isgrounded to the pipe system to avoid adangerous electrical potential differ-ence.

5.8 Plug connectionPersonnel:n Qualified electrician

For devices of the RMU-A series, onlyswitch contacts with sealed-in connec-tion cables are available.

5.9 Contact protectionmeasures

The Reed-switches used in the switchcontacts are designed to be very sensi-tive to overload. To prevent destructionof the switch contact, the values speci-fied on the rating plate of the switchcontact housing must never beexceeded (not even temporarily).

There is a risk of overload from:

n inductive loadsn capacitive loadsn ohmic loads.

Suitable measures must be taken toprotect against overload (see followingexamples):

Inductive load

There is danger of voltage peaks frominductive loads when switching off (upto 10 times the rated voltage). Induc-tive loads are caused by, e.g.:

n Contactors, relaysn Solenoid valvesn Electric motors

Installation and initial startupContact protection measures


Examples of protective measures:

Fig. 14: Example 1

Fig. 15: Example 2

Capacitive loads

There is a danger of high currentpeaks from capacitive loads whenswitching-on the switch contact(exceeding rated current). Capacitiveloads are caused by, e.g.:

n Long connecting cablesn Capacitive consumers

Example of protective measure:

Fig. 16: Protective measure againstcapacitive loads

Ohmic loads

There is a danger of high currentpeaks from ohmic loads whenswitching-on the switch contact. Thereason for this is that the glow filamenthas a low resistance at low tempera-tures. Ohmic loads are caused by, e.g.:

n Filament bulbsn Motors during startup

Examples of protective measures:

Fig. 17: Example 1

Fig. 18: Example 2

Protection against ohmic loads can beachieved through installation of aresistor in the circuit, or by heating theglow filament. For connection to high-impedance consumers (ex. PLC), aprotective circuit is not needed.

Installation and initial startupContact protection measures


6 Operation6.1 Setting the switch

pointSetting the switch point of aninstalled device

The following instructions describethe procedure for a Normally OpenContact (NOC). The actual state(open or closed) can be deter-mined using a continuity meter.


Tools:n Hex screwdriver

Fig. 19: Loosen set screws (exampleswitch point adjustment scale)

1. Loosen the set screws of theswitch contact ( Fig. 19/1) usinga hex screwdriver.

2. Slide the switch contact to theflow value to be monitored.Make sure that the arrow on theswitch contact data plate is inexact alignment with the desiredflow rate on the switch pointadjustment scale.

3. Tighten the set screws of theswitch contact ( Fig. 19/1) usinga hex screwdriver. When doingso, observe the correct tight-ening torque of the screws.

Ä Chapter 11.1 “Tighteningtorque” on page 63

ð The set switch point corre-sponds to the switch-offpoint of the switch contactby decreasing flow.

OperationSetting the switch point


Setting the switch point of a non-installed device

Fig. 20: Loosen the set screws(example switch point adjustmentscale)

1. Loosen the set screws of theswitch contact ( Fig. 20/1) usinga hex screwdriver.

2. Slide the switch contact to theflow value to be monitored.Make sure that the arrow on theswitch contact data plate is inalignment with the desired flowrate on the switch point adjust-ment scale.

3. Tighten the set screws of theswitch contact ( Fig. 20/1) usinga hex screwdriver. When doingso, observe the correct tight-ening torque.


ð The set switch point corre-sponds to the switch-offpoint of the switch contactby decreasing flow.

OperationSetting the switch point


6.2 Checking the flowReading-off the flow value


Protective equipment:n Goggles

Fig. 21: Reading-off the flow value(example switch point adjustmentscale)

1. Make sure that the setting arrowand the scale mark on the switchpoint adjustment scale are inalignment ( Fig. 21).

2. Look straight on. By viewing atan angle from above or below,the reading can be falsified.(Parallax error).

3. Read-off the flow value from theswitch point adjustment scale

OperationChecking the flow


7 TroubleshootingThis chapter describes possible mal-functions of the device, their causesand repair.

If malfunctions persist or increase,shorten the maintenance interval tomeet the actual operating conditions.

For malfunctions not described in thischapter, please contact the manufac-turer (see service address on page 2).

7.1 SafetyWork carried out incorrectly toremedy a malfunction

WARNING!

Risk of injury due to incorrectrepair of malfunction!Work carried out incorrectly mayresult in severe injuries and con-siderable damage to property.

– Ensure that the site is suffi-ciently cleared before com-mencing work

– Ensure that the repair locationis orderly and clean! Compo-nents and tools that are lyingabout or on top of each otherare potential causes of acci-dents

– If components have beenremoved, observe correctassembly procedures. Rein-stall all fixing/fastening ele-ments and observe the pre-scribed tightening torque forthe screws

– Before placing the device backinto operation, ensure that allwork has been carried out andcompleted in compliance withthe specifications and instruc-tions in these OperatingInstructions

TroubleshootingSafety


Conduct in case of malfunction

The complete machine or system maybe unsafe if there is a defect at the flowmonitor (e.g. fractured housing).

The following always applies:

1. In case of malfunctions thatpresent an immediate danger topersons or valuables, proceedaccording to the valid emer-gency plans for the system

2. Determine the cause of the mal-function

3. Before repair, ensure that thereis no danger to persons fromescaping media

4. If necessary, allow the pipelineand device to cool down or towarm up before commencingwork

5. Malfunctions must be correctedby qualified personnel

The following troubleshootingguide provides an indication ofwho is qualified to repair the fault .

TroubleshootingSafety


7.2 Troubleshooting guideFault description Cause Remedy Personnel

The switch contactdoes not switch.

No mediumflowing throughflow monitor

Check that medium isflowing through the pipe-line

Qualifiedpersonnel

Flow is too low orthe switch con-tact is set toohigh

n Adjust the switchcontact to a lowerflow rate

n Use the device atanother measuringrange

n Increase the flowrate

Qualifiedpersonnel

Incorrect reduc-tion fitting or pipediameter is toosmall

n Correct pipe diam-eter

Qualifiedpersonnel

Float is stuck Disassemble and cleanthe device

Qualifiedpersonnel

Switch contact isdefective.

n Remedy the cause ofthe defect (short-cir-cuit, overload)

n Replace the switchcontact

Qualifiedpersonnel

Switch contact ispermanentlyswitched.

Flow is too highor the switchcontact is set toolow

n Reduce the flown Adjust the switch

contact to a higherflow rate

n Use the device atanother measuringrange

Qualifiedpersonnel

TroubleshootingTroubleshooting guide


Fault description Cause Remedy Personnel

Float is stuck Disassemble and cleanthe device

Qualifiedpersonnel

Switch contact isdefective

n Remedy the cause ofthe defect (short-cir-cuit, overload)

n Replace the switchcontact

Qualifiedpersonnel

The switch point isnot the same asthe actual flow rate.

Improper scaleinstalled formedia used

Request proper conver-sion table or scale formedia used

Qualifiedpersonnel

Incorrect reduc-tion fitting or pipediameter is toosmall

n Correct pipe diam-eter

Qualifiedpersonnel

Device is dirty Disassemble and cleanthe device

Qualifiedpersonnel

Device is defec-tive

Remove device fromsystem and contact themanufacturer

Qualifiedpersonnel

TroubleshootingTroubleshooting guide


8 Maintenance8.1 SafetyMaintenance work performed incor-rectly

WARNING!

Risk of injury due to mainte-nance work performed incor-rectly!Maintenance work performedincorrectly may result in severeinjuries and considerable damageto property.

– Ensure that the site is suffi-ciently cleared before com-mencing work.

– Ensure that the repair locationis orderly and clean! Compo-nents and tools that are lyingabout or on top of each otherare potential causes of acci-dents.

– If components have beenremoved, observe correctassembly procedure. Reinstallall fixing/fastening elementsand observe the prescribedtightening torque for thescrews (see Chapter 11.1).

– Before placing the device backinto operation ensure that allwork has been carried out andcompleted in compliance withthe specifications and instruc-tions in these OperatingInstructions.

8.2 Maintenance planIntervals for replacement of wearparts

RMU-A type flow monitors require verylittle maintenance due to the smallnumber of moving parts. The intervalsfor the replacement of wear partsdepends significantly on the operatingconditions as well as on the composi-tion of the medium flowing through thedevice. For this reason, no intervalshave been set by the manufacturer.The operator must determine suitableintervals based on the local conditionand circumstances.

MaintenanceMaintenance plan


Interval Maintenance work Personnel

Visual inspection for dirt/soiling Qualified personnel

Visual inspection for free-movement of float Qualified personnel

Visual inspection for leaks from the device Qualified personnel

Check proper functioning of the switch contact Qualified personnel

8.3 Removal from thepipe system

The flow monitor must first be removedfrom the pipe system before per-forming maintenance.

WARNING!

Risk of injury from pressurizedlines!Severe injuries may result if thepipe system is under pressurewhen removing the device.

– Depressurize the systembefore removing the device

WARNING!

Risk of injury from hot or coldsurfaces!Pipelines can heat up/cool downdramatically due to the mediaflowing through them. Skin contactwith hot or cold surfaces causessevere skin burns or frost bite.

– Before removing the device,ensure that the machine orsystem and the flow monitorhave been controlled to a tem-perature range between 0 and40°C

– Do not touch any part of themachine or system that iseither very hot or very cold

– Always wear heat-resistant/cold-resistant protective workclothing and protective gloveswhen working near hot/coldsurfaces

MaintenanceRemoval from the pipe system


WARNING!

Risk of injury from media in thepipe system!If the pipe system contains haz-ardous media, severe injuries maybe caused by escaping media.

– Before removing the device,ensure that the pipe system isempty and does not containmedia residue

– Always wear personal protec-tive equipment when removingthe device

WARNING!

Risk of injury from media res-idue in the device!After the pipe system has beenemptied, media residue can still bepresent inside the device. In thecase of hazardous media, thiscould result in serious injuries.

– When removing (de-installingthe device from the pipesystem), always wear per-sonal protective equipment.

– All requirements specified inthe media safety data sheetmust be observed in accom-plishing the work task.

– Residue of hazardous mediain the device can result inserious injuries.

Removing the device from the pipesystem


Protective equipment:n With hazardous media, the protec-

tive equipment specified in theSafety Data Sheet of the mediummust be worn. In addition, thespecifications of the system oper-ator must be followed. If no protec-tive equipment is specified, suit-able protective gloves and gogglesmust be worn.

Tools:n Fixed spanner

1. Loosen the adapter union of thepipe line using a suitablespanner. When doing so, lockthe process connection ordevice body in place with asecond spanner.

2. Secure the device against fallingand repeat Step 1 at the otherprocess connection.

8.4 DisassemblyTo replace wear parts or to clean thedevice, the flow monitor must first bedisassembled.

MaintenanceDisassembly


WARNING!

Risk of injury due to incorrectdisassembly!– The device may still contain

media residue– Wear personal protective

equipment when working withhazardous media

– Improper disassembly maycause serious injuries if haz-ardous media is still presentinside the device

CAUTION!

Risk of injury due to incorrectdisassembly!Incorrect disassembly may resultin injuries.

– Before disassembling, ensurethat the flow monitor hascooled down/warmed up to atemperature range between 0and 40 °C

– Wear personal protectiveequipment to protect againsthazardous media which maystill be present inside thedevice.




Protective equipment:n Gogglesn Protective gloves

Tools:n Fixed spannern Socket wrench

Special tools:n Threaded ring insertion tool



Fig. 22: Insert threaded ring insertiontool (outlet)

1. Insert the threaded ring insertiontool into the device outlet (Fig. 22) and turn until it rests inthe keyway of the threaded ring

Fig. 23: Loosen threaded ring (outlet)

2. Insert socket wrench into thethreaded ring insertion tool andloosen the threaded ring (Fig. 23). Hold the device body inplace using a proper sizedspanner wrench.



Fig. 24: Remove threaded ring (outlet)

3. Unscrew the threaded ring(outlet) from the device body (Fig. 24)

Fig. 25: Remove inner parts

4. Carefully turn the device body180° and remove the inner parts(spring, magnets and float). (Fig. 25)

Fig. 26: Spring, magnets and float

5. The inner parts of the flow mon-itor consist of the spring (Fig. 26/1), magnets ( Fig. 26/2)and float ( Fig. 26/3).

8.5 Maintenance

8.5.1 CleaningIt is the responsibility of the operator toestablish appropriate intervals and pro-cedures for cleaning the individualparts of the device. It must be ensuredthat the parts are not damaged duringthe cleaning process. When using

MaintenanceMaintenance > Cleaning


cleaning agents, it must be ensuredthat these are not aggressive to theparts and that there will be no dan-gerous reactions with media residue.Damaged parts must be replaced.

WARNING!

Risk of injury due to impropercleaning!The device may still contain mediaresidue

– To protect against hazardousmedia residue in the device,wear personal protectiveequipment.

– Do not use cleaning agentswhich may lead to dangerousreactions with media residue.

– All requirements specified inthe safety data sheet must beobserved when handling orotherwise using the medium.

– Residue of hazardous mediainside the device can causeserious injury.

CAUTION!

Risk of injury due to damagedparts!If parts of the device are broken ordamaged, they may cause injurydue to sharp edges or splintersduring the cleaning process.

– Damaged parts must bereplaced

– Carefully clean the parts of thedevice, so as not to causedamage.

– When cleaning, always wearappropriate personal protec-tive equipment.

– Incorrect disassembly canresult in injuries.

MaintenanceMaintenance > Cleaning




8.5.2 Parts replacementDepending on the operating conditions,wear parts such as float or magnetsmay have to be replaced. Stepsrequired to replace these parts corre-spond to those used to assemble thedevice Ä Chapter 8.5.3 “Assembly”on page 52.

8.5.3 AssemblyAfter cleaning the individual compo-nents, the flow monitor must be reas-sembled.


Tools:n Fixed spannern Socket wrenchn Torque wrench

Special tools:n Threaded ring insertion tooln Test rodn Magnetic pole indicator

Fig. 27: Inner parts

1. Insert spring ( Fig. 27/1) withmagnets ( Fig. 27/2) into thefloat ( Fig. 27/3), ensuring propermagnetic pole orientation (northpole toward device outlet).

MaintenanceMaintenance > Assembly


Fig. 28: Insert inner parts

2. Insert float with magnets andspring into the device body (Fig. 28)

Fig. 29: Insert threaded ring (outlet)

3. Insert the threaded ring (outlet)into the device body (outlet) (Fig. 29)



Fig. 30: Seat threaded ring (outlet)

4. Lightly seat the threaded ring(outlet) with the aid of thethreaded ring insertion tool andtighten with a torque wrench (Fig. 30), observing the propertorque ( Ä Chapter 11.1 “Tight-ening torque” on page 63)

Fig. 31: Check for smooth operation

5. Check the float for ease ofmovement ( Fig. 31) by applyinglight pressure with the test rod

ð If the float moves sluggishly,then disassemble the deviceÄ Chapter 9.2 “Disas-sembly” on page 57 andclean the float and devicebody bore

If the float is still sluggish afterhaving been cleaned severaltimes, contact the manufacturer.



8.5.4 Switch contactreplacement

Tools:n Hex screwdriver

Fig. 32: Loosen set screws

1. Loosen the set screws ( Fig. 32)of the switch contact using anappropriate sized hex screw-driver until the switch contactcan be removed.

Fig. 33: Remove switch contact

2. Remove the switch contact (Fig. 33) from the device

3. Position the new switch contact

4. Insert and lightly tighten the setscrews so that the switch con-tact can slide easily.

5. Connect a continuity meter: ForNormally Open Contact (NOC),pin 1 and pin 2 are assigned

6. Slide the switch contact in theopposite direction of flow up tothe stop. The switch contactmust now be closed.

7. Slowly push the switch contactin the direction of flow, until thecontact opens. This switch pointshould be set as accurately aspossible because it affects theaccuracy of the switch pointadjustment scale values (ifneeded, repeat steps 6 and 7).

8. Tighten the set screws (Fig. 32/1) observing the propertightening torque ( Ä Chapter11.1 “Tightening torque”on page 63)

9. Affix the enclosed data plate tothe side of the switch contact sothat the reference arrow is inalignment with the lowest scalemark. If a reference tick mark ison the data plate (recognizableas a thinner line), it is to be usedas the alignment mark. Theadhesive surface must be dryand free of oil and grease.

10. Adjust the desired flow rate (cut-off point) on the switch pointadjustment scale, then tightenthe set screws, observing theproper torque ( Ä Chapter 11.1“Tightening torque” on page 63)

MaintenanceMaintenance > Switch contact replacement


8.6 Measures to betaken after mainte-nance work

Take the following steps after comple-tion of maintenance work and beforeswitching on the device:

1. Check all previously loosened/released screw connections fortightness.


2. Clean the work area and removeall residual materials, packaging,substances or spills.

MaintenanceMeasures to be taken after maintenance work


9 Disassembly and disposalAfter its period of useful life, the devicemust be disassembled and disposed ofin an environmentally safe manner.

9.1 Safety

WARNING!

Risk of injury if disassembledincorrectly!Media residue, sharp edged com-ponents, pointed ends and cornerson and in the device or on toolsmay cause injuries.

– Ensure that the site is suffi-ciently cleared before com-mencing work

– Always wear protective equip-ment when handling dan-gerous media residue

– Handle open, or sharp-edgedcomponents carefully

– Ensure that the workplace isorderly and clean! Compo-nents and tools that are lyingabout or on top of each otherare potential causes of acci-dents

– Disassemble components pro-fessionally

– Secure components so thatthey do not fall or overturn

– In case of doubt, contact themanufacturer

9.2 Disassembly

Before starting disassembly:

n Remove operating materials andpackaging and dispose of properly.


Protective equipment:n Protective glovesn Goggles

1. Remove the device from thepipe line ( Ä Chapter 8.3“Removal from the pipe system”on page 46)

2. Disassemble the device (Ä Chapter 9.2 “Disassembly”on page 57)

3. Clean components properly andremove media residue

4. Dispose properly

Disassembly and disposalDisassembly


9.3 Return Materials9.3.1 Return Materials

AuthorizationFor products being returned, regard-less of the reason, the currently validprovisions of the returns policy set byMEISTER will apply. Return shipmentswhich do not comply with the returnspolicy may be refused by MEISTER atthe expense of the consignor.

9.4 DisposalIf no return or disposal agreement hasbeen made then recycle disassembledcomponents:

n Scrap metalsn Recycle plastic elementsn Dispose of the remaining compo-

nents according to their materialproperties

NOTICE!

Danger to the environment dueto incorrect disposal!Potential risk to the environmentmay arise due to incorrect dis-posal.

– Have electrical scrap, elec-tronic components, lubricantsand other supplies disposed ofby approved specialists

– In case of doubt, get informa-tion on environmentally safedisposal from the localauthority or special disposalexpert

Disassembly and disposalDisposal


10 Technical data10.1 Device data plateThe data plate is on the mechanicalpart of the flow monitor/flow meter andcontains the following information:

Fig. 34: Device data plate

10.2 Switch contactdata plate

Fig. 35: Switch contact data plate

Fig. 36: Switch contact data plate withpositioning arrow

The data plate is on the switch contacthousing and may provide the followinginformation:

n maximum voltagen maximum currentn maximum powern positioning arrow for cut-off point

Technical dataSwitch contact data plate


10.3 Dimension sheet

Technical dataDimension sheet


10.4 General specificationsType Overall dimensions (mm)

G * DN SW L1 L2 T

RMU-A11 1/2 15 27 90 - 14

RMU-A15 1/2 15 27 90 - 14

Type Overall dimensions (mm)

G * D1 D2 A1 A2 A3 A4 Weight(g) **

RMU-A11 1/2 - 31,2 - - - ca.37,5

350

RMU-A15 1/2 - 31,2 - - - ca.37,5

350

* NPT thread on request

**Connecting cable weight, 2m approx. 80g

10.5 Electrical specificationsNormally Open Contact (NOC)

Data Value Unit

Voltage 230 V

Current, maximum 3 A

Power, maximum 60 VA

Technical dataElectrical specifications


10.6 Measuring ranges10.6.1 Standard measuring rangesType Switch range for H2O at 20 °C*

l/min gph gpm

RMU-A11 2,5 – 11,0 40,0 – 175,0

RMU-A15 5,0 – 15,5 80,0 – 245,0

* The specified data are switch-off points (other switch ranges are available onrequest).

10.7 Operating dataDescription Value Unit

Max. media temperature 120 (optional 160°C) °C

Min. media temperature

It must be ensured thatthe medium does notfreeze.

-20 °C

Max. operating pressure 250 bar

Pressure loss 0,025 – 0,25 bar

Measuring accuracy ± 10 % of full scale value

RMU-A devices are not suitable foremployment in explosion-hazardzones.

Technical dataOperating data


11 Appendix11.1 Tightening torqueComponent/function

Description Size Torque Qty

Threaded ring Threaded ring(outlet)

G1/2" 5 Nm 1

Switch contact Cylinder headscrew, hex

M3x10 0,4 Nm 2

11.2 Replacement partsThe following replacement parts drawing provides an example of the constructionof an RMU-A type flow monitor. The actual configuration may vary depending onthe model.

AppendixReplacement parts


Item Qty Description

1 1 Device body

2 1 Float

3 2 Magnet

4 1 Spring

5 1 Threaded ring (outlet)

6 1 Switch contact with connecting cable

AppendixReplacement parts


Item Qty Description

7 2 Washer

8 2 Set screw (switch contact)

11.3 ToolsThe following tools are required:

Tools

n Fixed spanner 27 mmn Hex screwdriver 2,5 mmn Torque screwdriver and assorted

bladesn Socket wrench 1/2" and assorted

socketsn Torque wrench 1/2"

Special tools

n Threaded ring insertion tool RMU-A

n Test rod RMU-An Magnetic pole indicator

11.4 Sealant

Before using a sealant, ensure thatit is compatible with the mediaused and that it can be employedunder the given operating condi-tions.

n Ensure proper sealn Use a suitable sealant. Liquid seal-

ants will damage the flow monitorn Always follow the sealant manu-

facturer's instructions

AppendixSealant


11.5 Lubricants

Before using a lubricant, always make sure that it is compatible with the oper-ating medium.

For the proper mounting of O-rings, an O-ring installation tool may be purchasedfrom the manufacturer.

The following lubricants are suitable to facilitate installing the O-rings:

Lubricant O-ring material

NBR EPDM FKM

Glycerine* suitable suitable suitable

Soapy water suitable suitable suitable

* Glycerine must not be used if the device is used for sulfuric acid and/or nitricacid.

AppendixLubricants


12 IndexAAssembly . . . . . . . . . . . . . . . . . . 52

CCable . . . . . . . . . . . . . . . . . . . . . 36Component groups . . . . . . . . . . . 21Connected loads

Normally Open Contact (NOC) . 61Contact . . . . . . . . . . . . . . . . . . . . 7Contact protection measures . . . . . 36Copyright . . . . . . . . . . . . . . . . . . . 3Correct use . . . . . . . . . . . . . . . . . 10Customer service . . . . . . . . . . . . . 7

DDegree of protection

IP-Code . . . . . . . . . . . . . . . . . 36Device data plate . . . . . . . . . . . . . 59Device description . . . . . . . . . . . . 20Dimension sheet . . . . . . . . . . . . . 60Disassembly

disposal . . . . . . . . . . . . . . . . . 57Maintenance . . . . . . . . . . . . . 47

Disposal . . . . . . . . . . . . . . . . . . . 58

EElectrical connection . . . . . . . . . . 35employment . . . . . . . . . . . . . . . . 10Environmental protection . . . . . . . 17

Cleaning fluids . . . . . . . . . . . . 17Lubricants . . . . . . . . . . . . . . . 17

FFault table . . . . . . . . . . . . . . . . . . 43flow value . . . . . . . . . . . . . . . . . . 40

GGeneral

safety . . . . . . . . . . . . . . . . . . . 8

HHazard

Electrical current . . . . . . . . . . . 11Hazards

mechanical . . . . . . . . . . . . . . 12Media . . . . . . . . . . . . . . . . . . 14Radiation . . . . . . . . . . . . . . . . 13Temperature . . . . . . . . . . . . . 13

IInitial startup . . . . . . . . . . . . . . . . 34Installation

pipe line . . . . . . . . . . . . . . . . . 30preparatory work . . . . . . . . . . . 26

LLimitation of liability . . . . . . . . . . . . 3Lubricant . . . . . . . . . . . . . . . . . . 66

MMaintenance . . . . . . . . . . . . . . . . 50Maintenance plan . . . . . . . . . . . . 46Measuring range . . . . . . . . . . . . . 62

OOperating conditions . . . . . . . . . . 62Overview . . . . . . . . . . . . . . . . . . 20Owner . . . . . . . . . . . . . . . . . . . . 17

PPackaging . . . . . . . . . . . . . . . . . . 22Parts replacement . . . . . . . . . . . . 52Plug connection . . . . . . . . . . . . . . 36Precautions

general . . . . . . . . . . . . . . . . . 10Preparation

device . . . . . . . . . . . . . . . . . . 29

Index


RRead-off . . . . . . . . . . . . . . . . . . . 40Replacement parts . . . . . . . . . 16, 63Return Materials Authorization . . . . 58

SSafety

Disassembly . . . . . . . . . . . . . 57Safety equipment . . . . . . . . . . 15, 16Safety instructions

Transport . . . . . . . . . . . . . . . . 22Sealant . . . . . . . . . . . . . . . . . . . . 65Service . . . . . . . . . . . . . . . . . . . . . 7Special tools . . . . . . . . . . . . . . . . 65Storage . . . . . . . . . . . . . . . . . . . 23Strainer . . . . . . . . . . . . . . . . . . . 28Switch contact . . . . . . . . . . . . . . . 21

replacement . . . . . . . . . . . . . . 55Switch contact data plate . . . . . . . 59

Switch point . . . . . . . . . . . . . . . . 38Switch point adjustment scale . . . . 21Symbols

Packaging . . . . . . . . . . . . . . . 23Symbols used

in the instructions . . . . . . . . . . . 8

TTechnical data

general specifications . . . . . . . 61Tightening torque of screws . . . . . 63Tools . . . . . . . . . . . . . . . . . . . . . 65Transport inspection . . . . . . . . . . . 22

UUnimpeded flow section . . . . . . . . 27

WWarranty and guarantee provisions . 7

Index


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