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Gascoseeker 2-500User Handbook

GASCOSEEKER 2-500 USER HANDBOOK

2

Issue 1

25/08/03

Part Number: 42476

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INSTRUMENT SERIAL NUMBER

DATE OF ISSUE

ISSUED TO

RECORD OF INSPECTIONS

DATE WORKSHOP INSPECTEDBY

CHECKEDBY

i

COPYRIGHTThis User Handbook is copyright of Gas Measurement Instruments Ltd (GMI) andthe information contained within, is for use only with the Gascoseeker 2-500instrument. Reproduction, in whole or in part, including utilisation in machinescapable of reproduction or retrieval without written permission of Gas MeasurementInstruments Ltd is prohibited. Reverse engineering is not permitted.

LIABILITYEvery care has been taken in the preparation of this document, but GMI Ltd do notaccept any responsibility for errors or omissions and their consequences. Informationin this document is subject to change without notice. This document does not constitutea specification or basis for a contract. Your statutory rights under law are not affected.

MODIFICATION NOTICESGMI aim to notify customers of relevant changes in the product operation and maintainthis manual up to date. In view of the policy of continuous product improvementthere may be operational differences between the latest product and this manual.

This Handbook is an important part of the Gascoseeker 2-500 product. Please notethe following points:

• It should be kept with the instrument for the life of the product.

• Amendments should be attached.

• This Handbook should be passed on to any subsequent owner/user of theinstrument.

• Although every care is taken in the preparation of this Handbook it does notconstitute a specification for the instrument.

SOFTWARESoftware supplied on EPROM or similar device for use in a particular product, mayonly be used in that product and may not be copied without the written permission ofGas Measurement Instruments Ltd. Reproduction or disassembly of such embodiedprogrammes or algorithms is prohibited. Ownership of such software is nottransferable and GMI Ltd does not warrant that the operation of the software will beerror free or that the software will meet the customer’s requirements.

DISPOSAL ADVICEWhen no longer in use, dispose of the instrument carefully and with respect for theenvironment. GMI will dispose of the instrument without charge if returned to thefactory.


ii

SAFETY• The instrument must be regularly serviced and calibrated by fully trained

personnel in a safe area.• Batteries: Alkaline batteries must be exchanged in a safe area and fitted

correctly before use. Never use damaged batteries or expose to extreme heat.• Only GMI replacement parts should be used.• If the instrument detects gas, follow your own organisation’s procedures and

operational guidelines.• The combustion chamber is a flameproof assembly and must not be opened

in the presence of a flammable atmosphere.• Gasurveyor 500 series instruments are certified as EEx iad IIC T4

(-20oC< Tamb < 50oC). BAS01ATEX2292 II 2 G.UL Class 1 Groups A, B, C and D.

• This equipment is designed and manufactured to protect against otherhazards as defined in paragraph 1.2.7 of Annex II of the ATEX Directive94/9/EC

Any right of claim relating to product liability or consequential damage to any thirdparty against GMI is removed if the warnings are not observed.

AREAS OF USE

Exposure to certain chemicals can result in a loss of sensitivity of the flammablesensor. Where such environments are known or suspected it is recommended thatmore frequent response checks are carried out. The chemical compounds that cancause loss of sensitivity include Silicones, Lead, Halogens and Sulphur. Do notuse instrument in potentially hazardous atmospheres containing greater than 21%Oxygen. The enclosure material is polypropylene and must not be exposed toenvironments which are liable to result in mechanical or thermal degradation or todamage caused by contact with aggressive substances. Additional protection maybe required in environments where the instrument enclosure is liable to damage.

STORAGE, HANDLING AND TRANSIT

The batteries should be removed if the instrument is stored for longer than 3 months.The instrument is designed to handle harsh environments. The sensing elements aresealed to IP54 and the rest of the instrument to IP64. If not subject to misuse ormalicious damage, the instrument will provide many years of reliable service.

iii

REVISION RECORD

Date Pages Description Of Change

Issue 1 All New User Handbook26/08/03


iv

v


CONTENTS

COPYRIGHT ................................................................. i

LIABILITY ...................................................................... i

MODIFICATION NOTICES ........................................... i

SOFTWARE .................................................................. i

DISPOSAL ADVICE ...................................................... i

SAFETY ........................................................................ ii

AREAS OF USE ........................................................... ii

STORAGE, HANDLING AND TRANSIT ...................... ii

REVISION RECORD ..................................... iii

GENERAL ..................................................... 1% LEL ........................................................................... 2

% Volume Gas .............................................................. 2

Operation ...................................................................... 3

CONSTRUCTION ......................................... 4


vi

RANGES OF OPERATION ........................... 5% LEL Range ............................................................. 5% Gas Range ............................................................. 5LEL Range Display .................................................... 6

SENSOR LIFE ............................................... 8

SPECIFICATION ........................................... 9

OPERATING PROCEDURE ....................... 10

CALIBRATION ............................................ 11

BEFORE USE ............................................. 12

MEASURE MODE ....................................... 131. Switch ON .............................................................. 13

2. Ready For Use ...................................................... 15

3. Sample Start .......................................................... 15

4. Sample Finish ........................................................ 16

5. Switch Off ............................................................... 17

vii


ZERO MODE............................................... 19

OPERATOR MESSAGES ........................... 22SAMPLE ................................................................... 22OFF .......................................................................... 22SAMPLE FAULT ...................................................... 22ZERO FAULT ........................................................... 22BAT ‘Flashing’ ......................................................... 22BAT FAULT .............................................................. 22ZERO ....................................................................... 22

PROBE ........................................................ 23

SAMPLE LINE ............................................. 29

LEL / GAS MEASUREMENTS .................... 30Relationship of LEL and % Methane in Air ................ 30

% LEL (Lower Explosive Limit) ................................ 30% UEL (Upper Explosive Limit) ............................... 30% GAS ...................................................................... 30


viii

BATTERY LIFE ........................................... 32Battery Safety Code ................................................... 34

Battery Replacement ................................... 36

ASPIRATOR BULB ..................................... 40

Carrying Straps ........................................... 43

WAISTBAND HARNESS ............................. 46

INSTRUMENT COTTON FILTER................ 47

FAULT FINDING ......................................... 49Fault Finding ............................................................... 52

INSTRUMENT WILL NOT SWITCH ON ................. 52INSTRUMENT WILL NOT SWITCH OFF ................ 54BAT FLAG OPERATES AFTER SHORT TIME ...... 55BATTERIES DO NOT GIVE LONG USE ................ 56BAR GRAPH ON BATTERY TEST DOES NOTINDICATE 100% AFTER FITTING NEW BATTERIES.................................................................................. 58

ix


SAMPLE FAULT KEEPS OPERATING .................. 59ZERO FAULT FLAG OPERATES ........................... 61CHECK ZERO FLAG OPERATES .......................... 63BACKGROUND ILLUMINATION DOES NOTOPERATE ................................................................ 64INSTRUMENT SWITCHES ON AND IMMEDIATELYSWITCHES OFF ...................................................... 65INSTRUMENT STARTS CORRECTLY BUTSWITCHES OFF WHEN PUMP OPERATED ......... 67INSTRUMENT DOES NOT OPERATE ON DEPOTCHECKER ................................................................ 68GAS RESPONSE IS SLOW .................................... 70INSTRUMENT DOES NOT CHANGE RANGE ....... 71NO NUMBERS ON DIGITAL DISPLAY................... 73

INDEX ............................................................ I


x

1


GENERAL

The G.M.I. Gascoseeker 2-500 has been designed as areplacement for the successful Gascoseeker Mk 2instrument for the measurement of % LEL and % VolumeGas.

This handbook describes the operation and usermaintenance of the instrument. The instrument has two basic measuring ranges.

• % LEL

• % VOLUME GAS


2

% LELThe % L.E.L. (Lower Explosive Limit) range indicates theexplosibility of the flammable gases in the sample. In thecase of METHANE (NATURAL GAS) 100% L.E.L.represents 5% by volume Methane in air. On this rangethe operating principle is a catalyst reaction and theinstrument measures the heat developed by thecombustion of the flammable portion of the atmosphereunder test.

% Volume GasThe % Volume Gas range indicates the total Volume of aspecific gas, usually METHANE (NATURAL GAS) presentwith respect to air and is scaled over the complete range0 - 100% Volume Gas. On this range the operating principleof the detection system is thermal conductivity.

3


OperationA sample of the atmosphere to be measured is drawnthrough the instrument by means of a pump via a filter intothe analysing chamber. The analysing chamber containsthe detection elements which monitor the gas.Range selection is automatic.

The total system is controlled by a microprocessor whichmaintains the necessary voltage conditions on the sensingelements, controls the pump and range selection anddisplays the result on a solid state analogue and digitaldisplay.The microprocessor carries out some housekeeping andstatus management functions for the instrument and theinstrument status is also shown on the display as is therange selected. The display is back illuminated when usedin low ambient light conditions.The total instrument is housed in a tough impact resistantmoulded case and is powered by size D LR20 alkalinecells to give up to 15 hours continuous operation.


4

CONSTRUCTION

The instrument is housed in a tough impact resistantmoulded case.The case material is carbon filled polycarbonate to reducestatic risk and remove interference from radio or otherequipment.The top surface of the instrument is covered with stainlesssteel escutcheons which are marked with the necessarybasic operating instructions.These plates provide additional impact resistance andprovide tough wear surfaces for everyday use.Protection for the display is by toughened glass to preventimpact damage and the display itself is mounted on a shockabsorbing mounting to prevent damage.The instrument is sealed against dust and water ingressto IP54 and the use of plastic mouldings and stainlesssteel fastenings provide high corrosion resistance.Additional markings and labelling are moulded into the caseas necessary.A detachable carrying strap is provided which can be variedin length and used as a neck sling or hand carrying handle.Instrument operation is by sealed push-buttons on theinstrument top plate.The instrument is ATEX certified without any additionalouter case.

5


RANGES OF OPERATION

% LEL RangeOn the % LEL range, the instrument shows the flammablegas concentration up to 100% LEL which for METHANE(NATURAL GAS) represents 5% Volume Methane in Air.The instrument calibration is shown on the instrument labeli.e. METHANE

%

SAMPLE

100806040200

LEL Range Display

% Gas RangeOn the % Gas range, the instruments are calibrated foruse in METHANE and will give inaccurate results if usedin other mixtures. In addition the instruments are calibratedfor METHANE (NATURAL GAS) in Air mixtures and shouldonly be used for such mixtures unless specially calibrated.The instrument calibration is shown on the instrument labeli.e. METHANEOn the % GAS range the instrument range is displayed inthe top right hand corner of the L.C.D. as GAS.


6

From 0-10% GAS the digital display shows a decimal pointand resolves the digital display to 0.5% GAS.From 10% - 100% GAS the digital display shows a decimalpoint and resolves the signal to 1% GAS.The analogue bar graph follows in 4% steps.

%

SAMPLE

100806040200

Gas Range Display

LEL Range DisplayOn the % LEL range the instrument range is displayed inthe top right hand corner of the L.C.D. and the digital displaywill show 0-100% LEL.From 0-10% LEL the digital display shows a decimal pointand resolves the digital display to 0.5% LEL.From 10% - 100% LEL the digital display shows a decimalpoint and resolves the signal to 1% LEL.The analogue bar graph follows in 4% steps.

7


%

SAMPLE

100806040200

Analogue Bar Graph Status Flags

Digital Display Range Indicator

Digital Display with Instrument Measuring LEL Range

The LIQUID CRYSTAL DISPLAY (LCD) is protected by atoughened glass cover and is weatherproof.Backlighting is provided automatically to enable the displayto be seen under low ambient light conditions.

%VSAMPLE STORE

ZEROFAULT

CHECKBAT

10000PPM80006000400020000

Digital Display with All Segments Activated


8

SENSOR LIFE

The sensors in the Gascoseeker 2-500 are manufacturedto give improved stability and longer life and will operatemany thousands of times with no effect on sensitivity orzero. Exposure to high concentrations of gas will notdamage the elements.The sensors are protected from water and dust damageby membrane and cotton filters.Provided the instrument is correctly maintained andserviced, the sensors are guaranteed for 1 year in normaloperation against the effects of zero drift and calibrationdeterioration within the instrument calibration span.

9


SPECIFICATION

Accuracy at N.T.P. for Methane (Natural Gas)

% LEL 2% Nominal +/- 1.5% L.E.L.

% Volume Gas 1% Nominal +/-1.0% GAS(When calibrated at defined point on scale, due tolineariser function)

Temp. Range: -20 Deg.C to +50 Deg.C

Humidity 20% - 95% RH (non condensing)

Pressure 950 to 1100 mbar

Operating time: in excess of 15 hours continuousduty on LR20 batteries.(at normal ambient temperature)

Size: 180mm x 95mm x 105mm

Weight: 1.6 kilos including batteries

Note: The instrument should not be used in:

a) Oxygen enriched atmospheres

b) The presence of catalyst contaminants such asSilicones, Halogens and Halides, Tetraethyl lead,Antimony.


10

OPERATING PROCEDURE

The instrument should always be used as per the operatingprocedures for the operation being carried out.

IF IN DOUBT, ASK YOUR SUPERVISOR

11


CALIBRATION

The instrument has been calibrated for a particular gasmixture in air.The calibration gas is identified by means of the calibrationlabel on side of instrument.Normally this would have “METHANE” written on it.This signifies that the instrument is suitable for use inMethane (Natural Gas) in air atmospheres.Other calibrations are possible but can only be set bycompetent persons in the instrument workshop.These include Butane or PropaneThe instrument can only be calibrated by competentpersons in a suitably equipped instrument workshop or ona suitably programmed Depot Checker.Before using instrument check that calibration / inspectionlabel has a valid date.


12

BEFORE USE

The instrument should be checked before setting out forsite to ensure that it is operational.The detailed check procedures are given later in themanual, but a short summary is given below.

• Check BATTERIES have sufficient life left in themfor your intended usage.

• Check ZERO on instrument in clean air.• Check instrument has correct CALIBRATION for

your usage.• Check instrument has no obvious FAULT condi-

tions.• Check CALIBRATION is still valid.• Check ACCESSORIES.• Instrument supplied with the following as standard:

- Carrying case- Handbook- Instruction Card- Battery compartment key- Probe handle complete with 1.5 metres sampling line, cotton filter and integral hydrophobic filter.- Long probe extension- Short probe extension- Carrying strap- Aspirator bulb(Waistband harness available as an accessory).

13


MEASURE MODE

1. Switch ONPush MEASURE button ONCE to switch ON.

OFFMEASURE

PUMP ONPUMP OFF

ZEROGASCOSEEKER 2-500

Push MEASURE buttononce to switch ON

Instrument performs self check and energises all segmentsin display.Pump also operates for a short period during this sequence.

%VSAMPLE STORE

ZEROFAULT

CHECKBAT

10000PPM80006000400020000


14

Display indicates instrument version identifier and softwareversion number.

V

Instrument version Indicates softwareprogram version

Bar graph indicates battery capacity and backgroundillumination activated.

100806040200

BAT

Background illumination ON

15


2. Ready For UseAfter a few seconds the instrument is ready for use,indicated by a flashing DIGITAL display.

%

100806040200

Display flashing

3. Sample StartA single press of the MEASURE button when the pump isstopped starts the pump and draws the sample.

OFFMEASURE

PUMP ONPUMP OFF


Push MEASURE buttononce to switch ON


16

The sample flag indicates that the pump is running.

%

SAMPLE

100806040200

4. Sample FinishA single press of the MEASURE button when the pump isrunning stops the pump and stops sampling.

OFFMEASURE

PUMP ONPUMP OFF


Push MEASURE button onceto switch pump OFF

This is indicated by the absence of the SAMPLE flag anda flashing display.

17


%

100806040200

Display flashing

5. Switch Off(a) To switch off, depress MEASURE button twice in

rapid succession.

OFF appears in the display and instrument will shutdown.

To cancel, press MEASURE button ONCE.

OFFMEASURE

PUMP ONPUMP OFF


Push MEASURE button twice in rapidsuccession to enter OFF sequence


18

(b) Switch OFF is automatic after 30 minutes running.

OFF appears in the display before automatic switchoff.

To cancel press MEASURE button ONCE.

%

100806040200

Display flashing

19


ZERO MODE

Make sure that the instrument is OFF and in FRESH AIRbefore zeroing.Press the ZERO push-button once.

OFFMEASURE

PUMP ONPUMP OFF


Push ZERO pushbutton onceto enter ZERO mode

The instrument will enter ZERO mode with similar testsequence to MEASURE mode.The pump also operates for a short period during thissequence.

%VSAMPLE STORE

ZEROFAULT

CHECKBAT

10000PPM80006000400020000


20

V

Instrument version Indicates softwareprogram version

ZERO

but with ZERO flag activated

100806040200

BAT

Background illumination ON

Instrument will enter the ZERO mode, indicated by ZEROin the status display and zero the instrument automatically.Only Zero errors of less than 4% can be zeroed by thisfunction.

21


%

100806040200

Display flashing

ZERO

If this operation does not reset the zero and remove theZERO FAULT or CHECK ZERO flags, the instrumentshould be returned to the service centre for checking.The instrument switches OFF automatically from the ZEROmode.The instrument can only be zeroed by switching OFF fromthe MEASURE mode.

%

100806040200

ZERO


22

OPERATOR MESSAGES

A number of messages can appear in the display window,indicating instrument status and operator action.READ AND UNDERSTAND HANDBOOK BEFORE USE

SAMPLEIndicates that the pump is running and the instrument issampling.

OFFIndicates that the instrument is about to switch OFFCan be reset by pressing MEASURE button once.

SAMPLE FAULTIndicates that the instrument sample flow is incorrect dueto sample path blockage or pump failure.

CHECK ZEROIndication that there may have been a zero shift due to thepresence of gas. Switch off the instrument and switch onagain in fresh air.

ZERO FAULTIndicates that zero is outside calibration limits.Switch instrument OFF and initiate ZERO sequence withinstrument in fresh air to reset zero.

BAT ‘Flashing’Indicates that the batteries will soon require replacementas indicated by BAT FAULT flag.

BAT FAULTIndicates that the batteries require replacement.

ZEROIndicates that the instrument is in the ZERO mode.

23


PROBE

The instrument is provided with a probe containing both acotton and a hydrophobic filter.The probe ends can be changed to provide a short probewith an open end, or a long probe with a closed end.

The filters in the probe should be changed by the operatoras required.The cotton filter should be changed on a regular basis,say once per week depending on use, when dirty,contaminated by water, etc.The hydrophobic filter should only be replaced whencontaminated with dirt or water and cannot be cleared.


24

Hydrophobic Filter

Cotton Particulate Filter

Probe Handle Assembly

The sample line is permanently attached to the probe bymeans of a clip.The instrument should not be used without the probe andits filters in place.The probe filters help maintain a clean flow path and,properly used, prevent the ingress of water into theinstrument itself.Should water enter the probe filters, the instrument pumpshould turn off and the instrument should display a flashingSAMPLE FAULT together with a flashing display to indicatethe pump is not operating.

25


%

100806040200

Display flashing

SAMPLE

FAULT

1) Check to ascertain whether water has entered theprobe.

2) Disconnect probe sample line from instrument.

3) Remove probe handle from probe end.

4) Remove cotton filter and discard.


26

5) Remove hydrophobic filter, noting which way filteris fitted. (label on filter against label on probe end).

6) With the inlet side of filter (i.e. non label side offilter facing downwards) tap out any water andensure the filter is not contaminated with dirt.

7) Check sample line is clear of water before replacinghydrophobic filter.

If necessary, use aspirator bulb to blow into theoutlet (i.e. label side) to remove any residual water.

27


8) Replace hydrophobic filter, ensuring that youreplace it in the same way as it was before (i.e.label on filter against label on probe handle).

9) Fit new cotton filter into probe handle.

10) Reassemble probe handle and reconnect toinstrument.


28

Make sure that instrument will operate without activatingSAMPLE FAULT flag when pump is running, to ensure thatfilter is clear.

%

100806040200

Sample flag operates with MEASURE buttonand no SAMPLE FAULT flag flashing

SAMPLE

If SAMPLE FAULT continues to activate, fit a newhydrophobic filter.Do not discard old hydrophobic filter since it will probablyoperate correctly when water has dried out in hydrophobicmembrane.

29


SAMPLE LINE

The probe is supplied complete with 1.5 metres of sampleline attached.

The sample line is connected to the right hand inlet nozzleof the instrument.The sample line fits easily over the male spigot of the inletnozzle.

Make sure that the sample line is in good condition, is notsplit or perished, and forms a good seal with the inletnozzle.


30

LEL / GAS MEASUREMENTS

Relationship of LEL and % Methane(Natural Gas) in Air

% LEL (Lower Explosive Limit)i.e. the lowest concentration of METHANE (NATURALGAS) in air that can cause an explosion. This figure variesfor every explosive gas and is approximately 5% Gas forMETHANE (NATURAL GAS)e.g. 100% LEL = 5% Gas

10% LEL = 0.5% Gas1% LEL = 0.05% Gas

% UEL (Upper Explosive Limit)i.e. the highest concentration of METHANE (NATURALGAS) in air that can cause an explosion. Again, this figureis gas specific and is approximately 15% Gas forMETHANE (NATURAL GAS).Note: UEL is not in common usage as a unit because,while a concentration of 20% gas is greater than theexplosive limit, it still represents a hazard since dilutionwith air can produce an explosive mixture.

% GASIn this case, the percentage of METHANE (NATURALGAS) in Air, i.e. 10% Gas = a mixture of 10% METHANE(NATURAL GAS) and 90% Air.Note: Emphasis must be made that any reference to %

31


LEL and % GAS in this handbook relates to a METHANE(NATURAL GAS) in Air mixture only, as the presence ofother gases can have a significant effect on the explosivityof the mixture.The relationship between LEL and % METHANE(NATURAL GAS) in Air is shown in the following table:


32

BATTERY LIFE

1) To obtain the 15 hours operating life specified youshould use only LR20 alkaline cells.

2) Only 4 new cells should be fitted. When the cellsare low or exhausted it is necessary to fit 4 newcells to reset the battery indicator bar graph to100%.

3) Partially used cells will not achieve the battery resetfunction and will result in less usage from partiallyused cells.Do not mix new and old cells.

4) 15 hours operational life will only be attained atambient temperature 15oC - 20oC since batterycapacity is affected by temperature.

5) The battery bar graph gives an indication of batterylife, but may not be totally linear.

A typical battery bar graph shape is shown in thefollowing diagram:

33


7) When BAT alarm flag is initiated there should betypically 1 - 2 hours life left for operation at normaltemperature when alkaline cells are used.

8) BAT warning flag is a warning; the instrument maycontinue to be used until it switches offautomatically.

9) Check battery condition before use. If signs ofleakage or damage do not use.


34

Battery Safety CodeUsed correctly, primary cells/batteries are a safe anddependable source of portable power.Problems can occur if they are abused, resulting in leakageor other incidents which could cause equipment failure orpersonal injury.Here are some simple rules to help eliminate suchproblems.

ALWAYSTake care to fit your batteries correctly, observing the +and - markings on the battery and the instrument.

ALWAYSReplace the whole set of batteries at one time, taking carenot to get old and new batteries or batteries of differenttypes mixed, since this can result in leakage, overheatingor other failures.

ALWAYSKeep unused batteries in their packing and away frommetal objects which may cause a short circuit resulting inleakage or generation of high temperature.

ALWAYSRemove spent batteries from the instrument and allbatteries from instruments unused for long periods.Otherwise the batteries may leak and cause damage.

35


ALWAYSMake sure the cells are undamaged, in good condition, incontact with the springs and the battery compartment coveris secure, when replacing batteries and before instrumentuse.Spare batteries can be kept in the carrying case for fieldreplacement.

NEVERUse or handle batteries which are physically damaged,leaking or heating up when not in circuit.

NEVERDispose of batteries in fire as this can cause them toexplode.

NEVERAttempt to recharge a dry cell. They may leak or explode.


36

Battery Replacement

If the BAT flag appears:- or you are unable to SWITCH THE PUMP ON- or you are unable to SWITCH THE INSTRUMENT ON- or you are unable to SWITCH THE INSTRUMENT OFF

. . THE BATTERIES MAY REQUIRE REPLACEMENT

Use only LR20 Alkaline BatteriesDuracell / Procell MN1300 LR20 size D and EverReady Energiser LR20 size D.

The Gascoseeker 2-500 contains four (4) batteries. Allshould be replaced at any one time with fresh batteries.

To Replace the batteries, proceed as follows:

1) Operate in a safe area.

2) Switch Instrument OFF before starting to replace.

3) Loosen instrument base plate screws (4mm.hexagonal x 2) using special tool provided.

37


4) Remove battery cover


38

5) Remove old batteries

6) Check battery compartment for damage to springcontacts or corrosion on springs.

39


7) Replace all four (4) batteries with new units.

Observe correct polarity with indicator marked inbattery compartment base.

8) Replace base plate and fasten base screws.

9) Check that instrument switches ON, batteryindicator and analogue display is satisfactory atswitch ON.


40

.

ASPIRATOR BULB

An aspirator bulb is provided should the pump fail, to enablea sample to be taken.The aspirator bulb is fitted with an adaptor to enable it toconnect to the instrument outlet. It will not connect to theinlet.Ensure that the bulb has an adaptor fitted.The bulb should be checked periodically to ensure that itis functioning correctly.Place finger over inlet hole in bulb adaptor and close inleti.e. Hole in stainless steel adaptor and depress bulb.Bulb should not re-inflate whilst hole in adaptor is covered.

Release finger from inlet hole and bulb should re-inflate inless than 5 seconds.

41


The bulb can be used to aspirate the instrument in theevent of pump failure. Normally this would be indicated byeither

1) Flashing digital display.

2) Absence of SAMPLE flag on display.

3) Flashing SAMPLE FAULT on display.

If these cannot be cleared by

- New batteries

- Switching instrument OFF and ON again

- Operation of MEASURE button to operate pump

- Checking for water ingress in probe, clearing andreplacing filters

- Ensuring that sample line is not blocked

. . then the aspirator can be used in an emergency todraw sample through instrument.


42

Connect aspirator bulb to outlet of instrument.

The connection may not be leak free, however, this shouldnot affect instrument performance.Aspirate sample through instrument as desired.Remember that display may be flashing since this is anindication of pump not running.Only use this as an emergency and return instrument toinstrument workshop for repair immediately.

43


Carrying Straps

The carrying straps on the instrument are removable andadjustable.They include a shoulder pad and ‘D’ shaped loops forattachment of a waistband harness, (where desired).

The waistband harness isnot supplied with theinstrument as standard, butis available as an accessory.

To affix to instrument,apply circular hole in keyslot on strap to clip tostainless steel boss oninstrument body.Locate clip flush againstinstrument body.


44

Strap can be adjusted to length by means of buckle.

Pull strap upwardsuntil strap cliplocates firmly onstainless steelboss with sharpclick.

45


Excess strap length can be clipped into open slot on top ofstrap clips.


46

WAISTBAND HARNESS

The waistband harness is supplied as an accessory.

The waistband harness is attached to the instrument usingthe ‘D’ clips on the shoulder harness.

47


INSTRUMENT COTTON FILTER

A cotton filter is not normally fitted within the instrumentsince this normally is incorporated into the probe handle.

However where the instrument is to be used without theprobe handle provision is made within the instrument toincorporate a separate cotton filter.This should not be used with a cotton filter in the probehandle.Filter can be fitted by removing the stainless steel inletnozzle from the instrument using a one pence coin orsimilar in nozzle slot and unscrewing in an anti clockwisedirection.


48

When nozzle is removed filter can be placed in nozzle notin instrument.

Nozzle and filter should then be placed in instrument,checking that ‘O’ ring seal on nozzle is not damaged beforereplacing.

The cotton filter in instrument should be removed afteruse.This filter should not be used with the normal probe sinceit already incorporates a cotton filter and two filters in theline can affect instrument performance.The instrument cotton filter should only be used underexceptional circumstances when it is not possible to usethe normal probe.e.g. long sample line necessary and access for probehandle too narrow.

49


FAULT FINDING

If the instrument does not appear to be functioning correctlyit should be returned to the supervisor or workshop forchecking and if necessary repair. There are a number offaults which can be checked and rectified by the user beforesending to the instrument workshop.

Instrument willnot switch ON

SEE PAGE52

NO

YES

Instrument willnot switch OFF

SEE PAGE54

NO

YES

Does the BATflag operateafter a short

time?

SEE PAGE55

NO

YES

Do thebatteries not

give long use?SEE PAGE

56

NO

YES


50

Does the bargraph on batterytest not indicate100% after fittingnew batteries?

SEE PAGE58

NO

YES

Does theSAMPLE FAULTkeep operating?

SEE PAGE59

NO

YES

Does theZERO FAULTflag operate?

SEE PAGE61

NO

YES

Does theCHECK ZEROflag operate?

SEE PAGE63

NO

YES

Is there nobackgroundillumination?

SEE PAGE64

NO

YES

51


Does instrumentimmediatelyswitch OFF?

SEE PAGE65

NO

YES

Does instrumentstart correctly

but switches OFFwhen pumpis operated?

NO

Does instrumentnot operate on

Depot Checker?

SEE PAGE68

NO

YES

SEE PAGE67

YES

Is the gasresponse slow?

SEE PAGE70

NO

YES

Does theinstrument notchange range?

SEE PAGE71

NO

YES

Are there nonumbers onthe display?

SEE PAGE73

NO

YES

CHANGE INSTRUMENT


52

Fault FindingIF IN DOUBT HAVE THE SUPERVISOR OR TECHNICALSTAFF CHECK THE INSTRUMENT FOR YOU

INSTRUMENT WILL NOT SWITCH ON

ARE BATTERIES FITTED?Instrument would normally be supplied without batteriesfitted to ensure that only fresh batteries are used at thetime of use.In addition the storage of instruments without batteriesprevents any problems associated with battery leakage inthe instrument.ACTION: FIT BATTERIES

ARE BATTERIES OPERATIONAL?Check and make sure that only fresh new alkaline batteriesare used.Batteries which have been used in other equipment shouldnot be used.ACTION: FIT NEW BATTERIES

- IF IN DOUBT FIT NEW BATTERIES

ARE BATTERIES CORRECTLY FITTED?The batteries have to be fitted in the battery compartmentin the correct way and in the correct alignmentCheck that the + and - symbols on the batteries line upwith those on the battery compartment and its labels.Make sure that the batteries are in contact with theterminals and each other A good tip is to rotate the batteries

53


once they are all in the battery compartment, to check thatthey are free and in contact.ACTION: CHECK ORIENTATION OF BATTERIES

ARE CONTACTS ON BATTERIES AND TERMINALSDIRTY?If the batteries or the Instrument terminals are dirty theymay not make a good enough contact to enable correctoperation to take place.They can be cleaned using a clean dry cloth; do not usesolvents, contact cleaners, grease etc. If in doubt returninstrument to workshop for checking. If battery has leakedcausing contamination of contacts, instrument should bereturned to workshop without cleaning.ACTION: CHECK BATTERIES AND CONTACTS

FOR CLEANLINESS

WILL INSTRUMENT SWITCH ON USING:1) MEASURE BUTTON?2) ZERO BUTTON?Instrument should switch on in either sequence althoughit will do different things If it does not, then the instrumentshould be returned to workshop for checking.ACTION: IF INSTRUMENT DOES NOT SWITCH

ON USING BOTH PUSH BUTTONS.RETURN TO WORKSHOP


54

INSTRUMENT WILL NOT SWITCH OFF

DOES OFF APPEAR ON DIGITAL DISPLAY?The OFF legend should appear in the LCD display toindicate the OFF sequence. This happens when instrumenthas been running for approximately 30 minutes or theMEASURE button has been pressed twice in rapidsuccession.Check if the instrument is being calibrated, Depot checkedor is connected to an alarm unit. In the communicationsmode, the 30 minute time is inhibited and the instrumentwill continue to run until switched off manually or until thebatteries are exhausted.ACTION: CHECK OFF LEGEND APPEARS

DOES MEASURE PUSH-BUTTON INITIATE OFFSEQUENCE?Two rapid operations of measure button should causeinstrument to enter OFF sequence and the OFF flag toappear in display.Operation of push-button is usually accompanied by ableep from internal buzzer unless instrument is incommunications mode.ACTION: CHECK OPERATION OF MEASURE

PUSH-BUTTON

55


BAT FLAG OPERATES AFTER SHORT TIME

ARE BATTERIES NEAR END OF LIFE?Normal life from a set of good quality alkaline batteries isin excess of 15 hours operation If pre-used or poor qualitybatteries are used the battery life may be substantiallyreduced.ACTION: REPLACE BATTERIES WITH GOOD

QUALITY ALKALINE CELLS

IS TEMPERATURE BELOW FREEZING?The operating performance of the batteries is given atnormal room temperature; although the batteries willoperate below freezing their operating time can besubstantially reduced.Keep spare batteries at room temperature for a few hoursif you are using the instrument below freezing.ACTION: KEEP A SET OF SPARE BATTERIES IN

THE HEATED VAN CAB RATHER THANIN THE UNHEATED SECTION IN COLDWEATHER CONDITIONS.

ARE FILTERS BLOCKED OR SAMPLE FLAGACTIVATED?If the batteries are poor quality or are nearly at the end oftheir life, then a restriction or blockage on the sample linecausing increased pump load may cause battery voltageto decrease, giving BAT flag after short period.ACTION: REPLACE BATTERIES WITH FOUR NEW

LR20 ALKALINE CELLS


56

BATTERIES DO NOT GIVE LONG USE

HAVE NEW BATTERIES BEEN USED?Alkaline batteries will give up to 15 hours use in normalconditions, pre-used or poor quality batteries should notbe used in the instrumentACTION: REPLACE BATTERIES WITH FOUR NEW

LR2O ALKALINE CELLS.

ARE LR20 ALKALINE BATTERIES FITTED?Only LR20 alkaline cells will give the specified instrumentperformance.ACTION: USE ONLY LR 20 ALKALINE CELLS

ARE ALL FOUR BATTERIES OF THE SAME MAKE ANDTYPE?All four batteries should be replaced at one time with newcells of the same make and typeDO NOT MIX BATTERY TYPESACTION: REPLACE ALL FOUR CELLS WITH NEW

LR20 ALKALINE CELLS

HAS INSTRUMENT BEEN USED AT LOWTEMPERATURE?The instrument performance of 15 hours is given at ambienttemperature between 15 Deg.C and 20 Deg.C; at lowertemperatures, particularly below freezing, battery capacitycan be dramatically reduced. Where the instrument is beingused at low temperature, replacement batteries should bestored in warmer conditions where possibleACTION: CHECK INSTRUMENT PERFORMANCE

AT AMBIENT TEMPERATURES

57


ARE BATTERIES REPLACED WHEN BAT OR BAT FAULTINDICATOR IS ACTIVATED?Batteries would normally be replaced when the BAT FAULTflag is activated to achieve maximum battery life, howevera work programme should not be commenced with theBAT flag activated and no spare batteriesThe operational time between the BAT and BAT FAULTflags depends on the particular batteries fitted, specificinstrument characteristics, ambient temperature and otherfactors.ACTION: CHECK WHEN BATTERIES ARE

CHANGED.

IS INSTRUMENT SWITCHED OFF MANUALLY OR LEFTTO SWITCH OFF AUTOMATlCALLY AFTER USE?The instrument switches off automatically after 30 minutesrunning, to conserve battery life, and to ensure that it isunlikely you will be left with a non- functioning unit becauseyou forgot to switch it off.If you do not switch the instrument off after use then eachoperation of the instrument will be 30 minutes: if you onlyuse it for 5 minutes then the battery life may appear to beexcessive relative to use. The instrument has an internalhours run counter that records the actual time operationalACTION: ALWAYS SWITCH INSTRUMENT OFF

MANUALLY AFTER USE


58

BAR GRAPH ON BATTERY TEST DOES NOTINDICATE 100% AFTER FITTING NEWBATTERIES

ARE 4 NEW ALKALINE BATTERIES FITTED?The bar graph indicates the battery condition at the lastswitch off to give a representative indication of potentialbattery lifeIt can only be reset by replacing all four batteries with fournew good alkaline cells at the same time. The use of mixedor partially used batteries may not reset the battery indicatorThe use of other types of battery, whether good or not,may also not reset the indicator, may cause the instrumentto malfunction and may in themselves be dangerous ingaseous atmospheres.ACTION: REPLACE ALL CELLS WITH FOUR NEW

LR20 ALKALINE BATTERIES

HAVE BATTERIES BEEN KEPT AT LOW TEMPERATUREFOR A PERIOD OF TIME?Battery capacity is a function of temperature and batteriesstored at low temperature are not able to release their totalpower potential.If the batteries have been stored in a vehicle overnight atbelow zero they may appear to have less capacity Wherepossible, batteries should be at ambient temperature beforeuse, even if instrument is being used in low temperatureconditions Store replacement batteries in vehicle cab ratherthan in unheated compartment.ACTION: KEEP REPLACEMENT BATTERIES AT

AMBIENT TEMPERATURE 1-2 HOURSBEFORE USE

59


ARE ALL BATTERIES OF SAME TYPE?Only LR20 alkaline batteries should be used and theyshould all be from the same manufacturer.DO NOT MIX BATTERY TYPES OR MANUFACTURERSACTION: ENSURE THAT LR20 ALKALINE

BATTERIES FROM ONEMANUFACTURER ARE FITTED

ARE RECHARGEABLE BATTERIES BEING FITTED?Under no circumstances should rechargeable cells be fittedto the instrument.ACTION: ENSURE THAT LR20 ALKALINE

BATTERIES ARE FITTED

SAMPLE FAULT KEEPS OPERATING

IS THERE WATER IN PROBE OR SAMPLE LINE?When the filters in the probe are blocked with water theSAMPLE FAULT flag should be activated in the instrumentto indicate this to the operator. The operation of the pumpmonitor is inhibited at low temperatures.ACTION: CHECK SAMPLE LINE AND FILTERS

FOR CONTAMINATION.

DO PROBE FILTERS REQUIRE CHANGING?If the filters have been used for long periods in dirtyatmospheres they may be contaminated and requirechanging.ACTION: CHECK CONDITION OF FILTERS.


60

HAS INSTRUMENT BEEN SWITCHED OFF AND ONAGAIN WITHOUT SAMPLE LINE ATTACHED?It may be necessary to switch the instrument OFF and ONagain to enable the flow sensor to initiate the test conditionsat start up which include the back pressure of the sampleline and probe.ACTION: SWITCH OFF. CHECK SAMPLE LINE

AND FILTERS AND SWITCHINSTRUMENT ON AGAIN.

HAS INSTRUMENT BEEN SWITCHED OFF AND ONAGAIN WITH CLEAN SAMPLE LINE, PROBE ANDFILTERS ATTACHED?It may be necessary to switch the instrument OFF and ONagain, to enable the flow sensor to initiate the testconditions at start up which include the back pressure ofthe sample line and probe, after new filters have been fitted.ACTION: SWITCH OFF, CHECK SAMPLE LINE

AND FILTERS AND SWITCHINSTRUMENT ON AGAIN.

HAVE NEW BATTERIES BEEN FITTED?Battery capacity may be limited due to a number of factorssuch as low temperature, poor cells, etc. When the pumpis operated under bad conditions, the increased currentwith low capacity batteries and low temperature may causean increase in motor current which could initiate a SAMPLEFAULTACTION: CHANGE BATTERIES IF IN DOUBT.

61


IS TEMPERATURE BELOW FREEZING?Low temperature reduces battery capacity and mayincrease pump current, thus causing SAMPLE FAULTconditions. In addition any moisture or water on the filtersfrom previous tests which have not been completelyremoved, may freeze and cause an increased load on thepump causing a SAMPLE FAULTACTION: CHECK OPERATION AT AMBIENT

TEMPERATURE.REPLACE BATTERIES WITH ONESKEPT AT AMBIENT.CHECK FILTERS AND REPLACE ASNECESSARY.

ZERO FAULT FLAG OPERATES

HAS INSTRUMENT BEEN ZEROED IN FRESH AIR?If instrument has not been zeroed in fresh air in the lasttest, or has gas in the flow path from being switched offwith gas in the sample line, then a false zero conditionmay be detected by instrument.ACTION: ALLOW INSTRUMENT TO FLUSH

THROUGH WITH FRESH AIR. SWITCHOFF AND INITIATE ZERO SEQUENCE INFRESH AIR.


62

HAS INSTRUMENT BEEN USED TO MEASUREPETROL, BUTANE OR SOME OTHER SUBSTANCEOTHER THAN METHANE?If instrument has been used for a heavy hydrocarbon or avolatile substance such as Petrol, this may be impregnatedinto the filters or some residue may be in sample line,which will register as a false zero in the zero checksequence.ACTION: CHECK FILTERS FOR CONTAMINATION.

CHANGE. IF NECESSARY.REMOVE SAMPLE LINE AND PROBE.SWITCH INSTRUMENT OFF.INITIATE A ZERO SEQUENCE IN FRESHAIR.

HAS INSTRUMENT BEEN SWITCHED OFF IN GASEOUSATMOSPHERE?If the instrument was switched off with gas in the samplepath then some may remain and this would alter the zerosetting, which would be detected by the instrument andindicated as a ZERO FAULT.ACTION: FLUSH INSTRUMENT WITH FRESH AIR

SWITCH OFFINITIATE A ZERO SEQUENCE IN FRESHAIR.

63


CHECK ZERO FLAG OPERATES

HAS INSTRUMENT BEEN SWITCHED ON IN GASEOUSATMOSPHERE?If the instrument has been switched on in an atmospherewhich contained some gas, then a CHECK ZERO warningmay be flagged to the operator as a warning This willdepend upon the exact concentration.ACTION: RE-ZERO INSTRUMENT IN GAS-FREE

FRESH AIR

WHEN WAS INSTRUMENT LAST ZEROED?The instrument should be zeroed at regular intervals. e.g.once per day or before use, if it has not been used forseveral days.ACTION: INITIATE ZERO SEQUENCE IN FRESH

AIR

HAS INSTRUMENT BEEN USED TO MEASURE GASESOR VAPOURS OTHER THAN METHANE?If the instrument has been used to measure heavyhydrocarbons, petrol or similar then some residue may bein filters or probe.ACTION: REMOVE SAMPLE LINE AND PROBE.

INITIATE ZERO SEQUENCE IN FRESHAIR.CHECK PROBE AND FILTERS FORCONTAMINATION.RE-APPLY SAMPLE LINE AND PROBEAND CHECK INSTRUMENT ZERO.


64

BACKGROUND ILLUMINATION DOES NOTOPERATE

IS INFRA RED LINK CLEAN ON INSTRUMENT TOPPLATE?The infrared sensor also detects the ambient light conditionand requires the apertures to be clear.ACTION: USE A DRY CLOTH TO REMOVE ANY

FOREIGN MATERIAL OR DEBRIS FROMTHE INFRARED APERTURE ON THE

TOP PLATE.

IS BACKGROUND LIGHT LEVEL SUFFICIENTLY LOW?The background illumination will only be initiated when theambient lighting is sufficiently low that the scale cannot beread.ACTION: ENSURE THAT AMBIENT LIGHT IS LOW

ENOUGH IN AREA OF INFRAREDSENSOR.

IS INSTRUMENT BEING USED ON A DEPOT CHECKER,CONNECTED TO AN ALARM UNIT OR BEINGCALIBRATED?When instrument is on a DEPOT CHECKER, or isconnected to any other equipment via the infra red link,then background illumination Is inhibited.ACTION: REMOVE INSTRUMENT FROM

CHECKER OR ANY OTHERCONNECTION.SWITCH INSTRUMENT OFF.SWITCH ON AGAIN AND CHECKILLUMINATION.

65


INSTRUMENT SWITCHES ON ANDIMMEDIATELY SWITCHES OFF

IS BAT OR BAT FAULT FLAG ACTIVATED?If batteries have low capacity or are of poor qual~ theymay provide sufficient power for a short time, thus enablingthe instrument to switch on, but rapidly dropping sufficientlyto initiate automatic shutdown via the BAT FAULT flag.ACTION: REPLACE BATTERIES WITH NEW LR20

ALKALINE BATTERIES.

ARE BATTERIES OF THE CORRECT TYPE?Only good quality alkaline batteries of the LR20 type shouldbe used; do not mix types of manufacturer.ACTION: REPLACE BATTERIES WITH GOOD

QUALITY NEW LR20 ALKALINE CELLS.

IS TEMPERATURE LOW?At low temperature the battery voltage may not be sufficientto operate instrument. The minimum operating temperaturefor LR20 alkaline cells is -20 Deg.C.ACTION: REPLACE BATTERIES WITH NEW

CELLS THAT HAVE BEEN KEPT ATAMBIENT TEMPERATURE.


66

ARE SAMPLE LINE AND INSTRUMENT FILTERSCLEAR?If the sample line and filters are blocked and the batterieslow, then the battery voltage may be pulled low by increasedpump current This may initiate a BAT FAULT and automaticshutdown.ACTION: CHECK FILTERS AND SAMPLE LINE

ARE CLEAR.REPLACE BATTERIES IF NECESSARY.

DOES INSTRUMENT COMPLETE ZERO SEQUENCE?If the instrument has a ZERO FAULT above a certain level,or the zero data in the instrument is corrupt, then the startup sequence tests cannot be completed satisfactorilyACTION: REPLACE BATTERIES.

ZERO INSTRUMENT AND RE-INITIATEMEASURE SEQUENCE.IF NOT SUCCESSFUL INSTRUMENTMUST BE RETURNED TO WORKSHOP.

67


INSTRUMENT STARTS CORRECTLY BUTSWITCHES OFF WHEN PUMP OPERATED

IS TEMPERATURE LOW?If the temperature Is low the battery capacity may bereduced and the pump current increased, thus causingbattery voltage to be reduced below the automaticshutdown level when the pump is switched ON.ACTION: REPLACE BATTERIES WITH NEW

CELLS THAT HAVE BEEN STORED ATAMBIENT TEMPERATURE THEN TRYSEQUENCE AGAIN.

ARE SAMPLE LINE AND FILTERS CLEAR?Low batteries used in low temperatures with a blockedsample line or filters, may reduce battery voltage belowthe automatic switch off point, thus causing the instrumentto switch OFF.ACTION: CHECK SAMPLE LINE AND FILTERS

FOR BLOCKAGE.

HAVE NEW BATTERIES BEEN FITTED?If the batteries are below capacity or they are not of goodquality, then they may reduce in voltage when the pump isoperated, thus switching the instrument OFF.ACTION: REPLACE BATTERIES WITH GOOD

QUALITY LR20 ALKALINE CELLS.

ARE LR20 ALKALINE BATTERIES USED?Only LR20 Alkaline cells will give the specified performanceACTION: REPLACE ALL BATTERIES WITH NEW

ALKALINE LR20 CELLS.


68

INSTRUMENT DOES NOT OPERATE ON DEPOTCHECKER

HAS INSTRUMENT BEEN ISSUED TO DEPOT?Instrument and Depot Checker require to be set up bytechnical staff to ensure that they are operating correctly.ACTION: CHECK WITH SUPERVISOR THAT THE

INSTRUMENT HAS BEEN ISSUED FORUSE ON DEPOT CHECKER.

DO OTHER INSTRUMENTS OPERATE ON DEPOTCHECKER?There may be a fault on the DEPOT CHECKER. If otherinstruments operate correctly on checker then DEPOTCHECKER is probably correct.ACTION: TRY OTHER INSTRUMENT ON

CHECKER. IF SATISFACTORY, WAIT 5MINUTES AND TRY AGAIN.REPORT INCIDENT TO SUPERVISOREVEN IF INSTRUMENT OPERATESSECOND TIME.

DOES THE CHECKER HAVE THE CORRECT GASESAND DO THE CYLINDERS CONTAIN SUFFICIENTPRESSURE?The Depot Checker will only operate satisfactorily if it hasthe correct gases connected to it and the gas pressuresare correctly set.ACTION: CHECK WITH A SUPERVISOR OR

AUTHORISED TESTERTO ENSURE DEPOT CHECKER ISOPERATING CORRECTLY.

69


IS THE INSTRUMENT TOP PLATE CLEAN AROUND THEINFRARED LINK?The instrument data is transmitted to the DEPOTCHECKER via the infrared link on the top plate. If this isdirty or obscured then the instrument may not be able tocommunicate with the checker.ACTION: CLEAN AREA AROUND INFRARED LINK

WITH DRY CLOTH ENSURING ANYDEBRIS IS REMOVED FROM OPTICALRECESS ON LINK.DO NOT WIPE MATERIAL INTORECESS, RATHER BLOW IT OUT.

HAVE YOU FOLLOWED THE DEPOT CHECKERINSTRUCTIONS?Instrument will only operate on DEPOT CHECKER ifinstructions are followed, particularly with regard toinstrument being OFF when put on checker and MEASUREbutton only operated when DEPOT CHECKER requestsit.ACTION: SWITCH INSTRUMENT OFF.

READ INSTRUCTIONS FOR CHECKER.RE-TEST INSTRUMENT FOLLOWINGINSTRUCTIONS EXACTLY.


70

GAS RESPONSE IS SLOW

IS THE INSTRUMENT DETECTING METHANE?The instrument response is setup using METHANE. If youare detecting other substances such as BUTANE. PETROLVAPOUR etc, the response may appear slow.ACTION: CHECK YOU HAVE CORRECT

INSTRUMENT FOR THE GAS YOU AREUSING.IF IN DOUBT ASK SUPERVISOR.

ARE THE BAT OR BAT FAULT FLAGS ACTIVATED?If the batteries are low, the pump flow rate may be reducedand hence the response time reduced.ACTION: CHANGE BATTERIES FOR NEW LR20

ALKALINE CELLS.

IS THE SAMPLE LINE OR PROBE TRAPPED ORBLOCKED?If the sample line or filters are blocked, the gas samplerate may be reduced.ACTION: CHECK FILTERS AND SAMPLE LINE

FOR BLOCKAGE, RESTRICTION ORCONTAMINATION.REPLACE AS NECESSARY.

71


IS THE TEMPERATURE LOW?If the temperature is low, the pump flow may be reducedbecause of battery voltage and any moisture in the filtersmay start to freeze, thus reducing flow rate.ACTION: REPLACE FILTERS WITH NEW ONES IF

NECESSARY. REPLACE BATTERIES WITH NEW LR20CELLS WHICH HAVE BEEN KEPT ATAMBIENT TEMPERATURE.

INSTRUMENT DOES NOT CHANGE RANGE

DOES THE INSTRUMENT COMPLETE THE MEASUREAND ZERO START UP SEQUENCES CORRECTLY?If the instrument has been left in the communications modeor has developed a fault then this may require to be reset.ACTION: SWITCH INSTRUMENT OFF.

ZERO INSTRUMENT.SWITCH ON IN MEASURE MODE TOTRY AGAIN.IF STILL WILL NOT CHANGE RANGE,INFORM SUPERVISOR AND RETURNINSTRUMENT TO WORKSHOP.


72

HAS THE INSTRUMENT BEEN CALIBRATED ORCHECKED?If the instrument has been calibrated or checked it mayhave been left in a non-range changing mode Switchinginstrument OFF and restarting it resets this function.ACTION: SWITCH OFF.

INITIATE ZERO SEQUENCE IN FRESHAIR.SWITCH ON USING MEASURE BUTTON.CHECK FOR RANGE CHANGE ANDRETURN TO SUPERVISOR.

IS THE INSTRUMENT BEING USED TO MEASUREMETHANE?Since the LE.L. and % Volume relationships with Methaneare programmed into the instrument and they are differentfor other gases, the instrument may not indicate correctlyif used on the wrong gas.ACTION: CHECK INSTRUMENT IS CALIBRATED

FOR THE GAS YOU ARE USING IT ON.

73


NO NUMBERS ON DIGITAL DISPLAY

DOES INSTRUMENT COMPLETE ZERO SEQUENCECORRECTLY?If the digital display is blank it indicates a zero shift thatthe instrument may not be able to correct, and may giveinaccurate readings. Thus the display is blanked to preventincorrect use Normally a ZERO FAULT flag would also beinitiated.ACTION: SWITCH OFF.

INITIATE ZERO SEQUENCE IN FRESHAIR.SWITCH INSTRUMENT ON IN MEASUREMODE.IF CLEAR AND NO FAULT FLAGS,INSTRUMENT IS CORRECT.IF DISPLAY STILL BLANK OR FAULTFLAG PRESENT, INFORM SUPERVISORAND RETURN INSTRUMENT TOWORKSHOP.


74

I


Index

Symbols% GAS 30% Gas Range 5% LEL 2, 30% LEL Range 5% UEL 30% Volume Gas 2

AAREAS OF USE iiASPIRATOR BULB 40

BBACKGROUND ILLUMINA-

TION 64BAR GRAPH ON BAT-

TERY TEST DOESNOT INDICATE 100%A 58

BAT ‘Flashing’ 22BAT FAULT 22BAT FLAG OPERATES

AFTER SHORT TIME55

BATTERIES DO NOT GIVELONG USE 56

BATTERY LIFE 32Battery Replacement 36Battery Safety Code 34BEFORE USE 12BULB, ASPIRATOR 40

CCALIBRATION 11Carrying Straps 43CONSTRUCTION 4COPYRIGHT iCOTTON FILTER 47

DDIGITAL DISPLAY 73DISPLAY, DIGITAL 73DISPOSAL ADVICE i


II

FFAULT, BAT 22FAULT FINDING 49Fault Finding 52FAULT, SAMPLE 22FAULT, ZERO 22FILTER, COTTON 47

GGAS RESPONSE IS

SLOW 70GENERAL 1

HHANDLING iiHARNESS, WAISTBAND

46

IILLUMINATION,

BACKGROUND 64INSTRUMENT COTTON

FILTER 47INSTRUMENT DOES

NOT CHANGERANGE 71

INSTRUMENT DOESNOT OPERATE ONDEPOT CHECKER68

INSTRUMENT STARTSCORRECTLY BUTSWITCHES OFF WHEN67

INSTRUMENT SWITCHESON AND IMMEDIATELYSWITCHES OFF 65

INSTRUMENT WILL NOTSWITCH OFF 54

INSTRUMENT WILL NOTSWITCH ON 52

LLCD 7LEL / GAS MEASUREMENTS

30LEL Range Display 6LIABILITY iLIQUID CRYSTAL DISPLAY

7

MMEASURE MODE 13measuring ranges 1MESSAGES, OPERATOR 22MODIFICATION NOTICES i

OOFF 22OPERATING PROCEDURE

10Operation 3OPERATOR MESSAGES 22

III


PPROBE 23PROCEDURE, OPERAT-

ING 10

Rranges, measuring 1RANGES OF OPERATION

5Ready For Use 15Relationship of LEL and %

Methane in Air 30Replacement, Battery 36REVISION RECORD iii

SSAFETY iiSAMPLE 22SAMPLE FAULT 22SAMPLE FAULT KEEPS

OPERATING 59Sample Finish 16SAMPLE LINE 29Sample Start 15SENSOR LIFE 8SOFTWARE iSPECIFICATION 9STORAGE iiStraps, Carrying 43Switch Off 17Switch ON 13

TTRANSIT ii

WWAISTBAND HARNESS

46

ZZERO 22ZERO FAULT 22ZERO FAULT FLAG

OPERATES 61ZERO FLAG 63ZERO MODE 19


IV

Head Office:Inchinnan Estate, Renfrew, PA4 9RG ScotlandTelephone +44 (0)141 812 3211 Fax +44 (0)141 812 7820http://www.gmiuk.com

Service Centre:Crownhill, 25 Cochran Close,Milton Keynes, MK8 OAJTelephone +44 (0)1908 568867 Fax +44 (0)1908 261056

http://www.gmiuk.com/

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