alpha house, 96 city road

bradford BD8 8ESengland

F 01274 733200

E-mail info@amsystems.co.uk

Web www.amsystems.co.uk

T 01274 733100

model ADHT-Ex intrinsically safe dewpoint transmitter

instruction manual

MODEL ADHT-Ex TRANSMITTER

INDEX

SPECIFICATION SHEET PAGE 1 INSTALLATION (SAMPLE CONDITIONING) PAGE 2 & 3 INSTALLATION (MTL 5042) PAGE 4 & 5 INSTALLATION (MTL 2441B) PAGE 6 & 7 OPERATION / MAINTENANCE PAGE 8

DRAWINGS HAZARDOUS AREA CERTIFICATION FOR MODEL ADHT-EX HAZARDOUS AREA CERTIFICATION FOR INDICATOR (if applicable) DOC:-ADHT-Ex-IND.-1

The Alpha Moisture Systems Model ADHT-Ex is a 3 wire, 4-20 mA, 24V powereddewpoint transmitter. The unit is fully self contained in a robust stainless steel casingwith weatherproof protection to IP65, making it ideal for use in heavy industrialenvironments.Designed with the operator in mind, Model ADHT-Ex is extremely easy to use andthe digital dewSMARTTM technology ensures accurate and reliable readings with littleor no maintenance.Model ADHT-Ex is certified intrinsically safe to EEx ia IIC T6 for use in hazardousareas using a MTL 2441B signal isolator for 110V AC or 240V AC operation, or MTL5042 for 24V DC operation.Various ranges are available covering an overall range from -110°C to +20°Cdewpoint. The Model ADHT-Ex derives its power directly from the signal isolatorand it is configured to give a linear 4-20mA signal for the chosen range.The 4-20mA output signal can be transmitted up to 1000 meters to eitherDCS,SCADA system or any other suitable equipment with an input impedance ofless than 600ΩΩ.Model ADHT-Ex is supplied readyfor use, with calibration certificatetraceable to National &International Humidity standards,instruction manual and 10 metresof connecting cable.

Model ADHT-ExIntrinsically Safe Dewpoint Transmitter

dewSMART™

Features :-

!! 3 Wire, 4-20mA, 24V Dewpoint Transmitter

!! Intrinsically Safe - CENELEC EEx ia IIC T6

ATEX II 1G

!! Overall Range -110°C to +20°C Dewpoint

!! Accuracy ± 2°C Dewpoint (or equivalent)

!! Calibrated in °C, °F or ppm(v)

!! Polarity Protected Input

!! Weatherproof Rating - IP65

!! Open / Short Circuit Detection

!! Built-in Temperature Compensation

!! High Resolution Measurement Circuitry

!! Calibration Traceable to National & International Standards

Alpha House, 96 City RoadBradford BD8 8ES EnglandTelephone: 01274 733100Facsimile: 01274 733200E-mail: info@amsystems.co.uk Web: www.amsystems.co.uk

WEIGHTS & DIMENSIONS

SENSOR

MODEL : ADHT Aluminium Oxide, Ultra High CapacitancedewSMART™ sensor with IP65 connector.

RANGE : Overall Range -110°C to +20°C dewpoint or 0.01 to23000ppm. (Other engineering units available)

ACCURACY : ± 2°C Dewpoint (3 Sigma RSS)

OPERATING TEMPERATURE RANGE : -20°C to +60°C

STORAGE TEMPERATURE : -40°C to +80°C

TEMPERATURE COEFFICIENT : Temperaturecompensated for operating range.

RESPONSE TIME : Wet to Dry : -20°C to -60°C - less than60 secs. Dry to Wet : -110°C to -20°C - less than 20 secs

SAMPLE FLOW RANGE : Flow independent but ideally 2 to5 sl/min

CALIBRATION : Supplied calibrated with traceability to NPL.(NPL traceability for range -75°C to +20°C)

RECOMMENDED RECALIBRATION PERIOD : 1 Year

REPLACEMENT SENSOR : Completely interchangeable

ELECTRICAL

TRANSMITTER TYPE : 3 Wire Type Transmitter

OUTPUT SIGNAL : 4 to 20mA Linear suitable for externalequipment with a maximum input impedance of 600 Ω(@ 24V) (Dependant on isolator selection)

MAXIMUM HAZARDOUS AREA CABLE LENGTH : > 200mDependant on cable parameters and hazardous area classification

MAXIMUM SAFE AREA CABLE LENGTH : 1000m

CABLE TERMINATIONS : IP65 rated connector at the sensorand other end terminated with bootlace ferrules.

ELECTROMAGNETIC COMPATIBILITY (EMC) Immunity : Complies with EN 50082-1 : 1992Emissions : Complies with EN 50081-1 : 1992

INTRINSIC SAFETYStandard : EN 50014:1992 / EN50020:1994Code : ATEX II 1G / EEx ia IIC T6Certificate No. : SIRA99ATEX2096X

For full safety description please request the above certificate.

WARRANTY : 2 years for faulty workmanship and defective parts.

65

mm

160 mm 78 mm

36 mm AF

3/4” UNF

Allow a minimum of 60mm above thesensor body for plug and cable.

Weight : 830gms

Product specification may be subject to change, without prior notice, as part of our ongoing product development programme.ADHT-Ex/12-99

Ordering InformationCODE RANGE

PL -110° to +20°CSR -110° to -20°CBL -80° to +20°CGY -80° to 0°CRD -80° to -20°CYW -60° to 0°CGD -50° to +20°CGN -30° to +20°C

Model ADHT-Ex

Example : If your requirement is for Dewpoint Transmitter with a range of -80°C to -20°C dewpoint then please order as : Model ADHT-Ex-RD

Corrosive GasesThe Sensor should not be exposed to corrosive gases (orcorrosive contaminants in the main gas sample) as theywould chemically attack the sensor and render it useless.Examples of such gases are mercury (Hg), ammonia (NH3),chlorine (Cl2) and wet acid vapours i.e. acid vapours in gaswith moisture content greater than 100ppm(v). Strongoxidising agents such as ozone (O3) should also beprevented from coming into contact with the sensor.

Safe AreaHazardous Area

SampleInlet

Exhaust

4/20mA

Power Supply

Signal Isolator/Repeater

MTL 2441B or

MTL 5042

Sensor Holder (OPTIONAL)Model DSH -

Fittings 1/4” OD pipe.............4Fittings 6mm OD pipe...........6Fittings 1/8” OD pipe.............8

With port for Pressure Gauge....................P

SPECIFICATIONS - Model ADHT-ExdewSMART™

Hazardous Area Cable Parameters when using MTL 2441Bor MTL 5042 signal isolators/repeaters.

Note: Samples should be taken from the upper surface ofthe main line to prevent any risk of condensate reachingthe sensor. Additional components may be required forspecific applications - refer to Accessories and SamplingSystem specification sheets. Use stainless steel, nickel orcopper piping wherever possible.

Gas GroupΙΙCΙΙBΙΙA

µF0.130.391.04

mH 4.3

12.633.6

µH/Ω55

165440

orInstallation

34mm

3mm

15

mm

90

mm

65

mm

45mm

38mmø

25

mm

55

mm

46mm

45mm

4 Mountingholes 5.5mmø

38mmø

Page 2

INSTALLING THE AIR/GAS SAMPLING SYSTEM The piping installation schematic diagram on page 3 of this manual, shows all components which could be used in a dry gas measurement application although all items shown will not be required for every installation. Care should be taken to ensure that the sample presented to the measuring sensor is not contaminated with any component that will damage, contaminate or affect the sensor in a way that will impair the system accuracy. It is strongly recommended that the sample should not contain particulate matter, oil or other heavy hydrocarbon condensate. If these components contaminate the sample system and/or the measuring sensor the system response time will be lengthened, although the sensor calibration will not be affected. The sample must not contain Ammonia, Chlorine, Ozone or any wet acid vapours or liquid as these will permanently damage the sensor and impair the calibration accuracy. The flow rate, although not critical to the sensor measurement, should be low enough to avoid abrasion to the sensor surface without being so low as to extend the system response time to an unacceptable level. In general, a flow rate of between 2 and 3 Sl/min will give the right balance. The sensor is a variable capacitor which is directly affected by changes in partial pressure of water vapour and these changes, which are proportional to the dew/frost point temperature are represented by the linear 4/20mA output. Partial pressure of water vapour is directly affected by total pressure and, this being the case, the 4/20mA output will be proportional to the dew/frost point temperature at whatever total pressure the sensor is exposed, therefore care should be taken to ensure that the sample pressure, at the sensor is that at which the dew/frost point readings are required. Where a sensor is calibrated to read absolute moisture content (e.g. ppm(V)) it is essential that this is done at a given operating pressure and that this pressure is maintained in the normal process operation. Failure to maintain this pressure will result in read-out errors. The measuring sensor can be installed directly into the process line, but this does create problems with access for maintenance and calibration. It is for these reasons that we recommend that the sensor be installed in a bypass, fast loop or total loss sample system where the sensor is accessible without interrupting the main process flow line.

DOC: ADHT-Ex-2.1-1

Page 4

INSTALLATION (USING MTL 5042) Refer to drawings 941, 942 and 943 and select the system appropriate to this application and to the appropriate hazardous area certification, paying special attention to the whole of this section to ensure a SAFE installation. SENSOR CABLE CONNECTOR TO TRANSMITTER

NOTE: The Plug and socket of the connector have location keys to ensure correct positioning. Care should be taken to ensure that correct alignment is made before attempting to mate the plug and socket or damage to the connector pins will occur, resulting in malfunction of the instrument. Refer to drawing1008. If a new or replacement cable assembly has to be manufactured, ensure that the diagram is followed exactly and no connections are made to pins other than 1, 3 and 7. NOTE. The other pins of the 7 pin connector, are only used in a SAFE area and must not, on any account, be used in the HAZARDOUS are. Failure to follow this instruction will invalidate the hazardous area certification and render the transmitter UNSAFE.

THE MTL 5042 ISOLATOR/REPEATER Refer to drawing 940. This drawing identifies the terminal numbers and there function. Follow these instructions carefully when wiring the device into the system. WARNINGS 1. Carry out all installation work in accordance with the relevant instruction given in a

nationally accepted code of practice for intrinsically safe installations. 2. Do not install isolators in hazardous areas unless they are housed in an enclosure

approved for the area concerned. 3. Mount isolators (and enclosures) in a clean, dry environment, shielded from direct

sunlight and other sources of heat. 4. Take great care to keep hazardous area and safe area wiring segregated when wiring

isolators, whether un-enclosed or within enclosures. 5. Do not use chemical cleaning solvents. DOC: ADHT-Ex-4.1.1

Page 5 MOUNTING THE MTL 5042 ISOLATOR/REPEATER Clip the MTL 5042 onto type T35 DIN rail, with the blue signal plugs facing towards the hazardous area wiring. To remove an isolator from the rail, insert a screwdriver into the sliding clip and lever the clip gently outwards. Pivot the isolator off the rail. WIRING THE MTL 5042 ISOLATOR/REPEATER Depending on the installation, it may be easier to wire up the isolator with the power and signal plugs in place, or removed. In either case, allow sufficient free cable to easily permit plug removal for future operations. Making connections:- a. Trim back the insulation of conductors by 12mm. b. Check the terminal assignments shown on drawing 940. c. Insert the conductors according to the terminal assignments and tighten the screws. NOTE. If wiring is to be fitted with crimp ferrules, the trimmed conductor length should be 14mm. DOC: ADHT.5.1.0

Page 6

INSTALLATION (USING MTL 2441B) Refer to drawings 1001, 1002 and 1003 and select the system appropriate to this application and to the appropriate hazardous area certification, paying special attention to the whole of this section to ensure a SAFE installation. SENSOR CABLE CONNECTOR TO TRANSMITTER

NOTE: The Plug and socket of the connector have location keys to ensure correct positioning. Care should be taken to ensure that correct alignment is made before attempting to mate the plug and socket or damage to the connector pins will occur, resulting in malfunction of the instrument. Refer to drawing1008. If a new or replacement cable assembly has to be manufactured, ensure that the diagram is followed exactly and no connections are made to pins other than 1, 3 and 7. NOTE. The other pins of the 7 pin connector, are only used in a SAFE area and must not, on any account, be used in the HAZARDOUS are. Failure to follow this instruction will invalidate the hazardous area certification and render the transmitter UNSAFE.

THE MTL ISOLATOR/REPEATER Refer to drawing 1000. This drawing identifies the terminal numbers and there function. Follow these instructions carefully when wiring the device into the system. WARNINGS 1. Carry out all installation work in accordance with the relevant instruction given in a

nationally accepted code of practice for intrinsically safe installations. 2. Do not install isolators in hazardous areas unless they are housed in an enclosure

approved for the area concerned. 3. Mount isolators (and enclosures) in a clean, dry environment, shielded from direct

sunlight and other sources of heat. 4. Take great care to keep hazardous area and safe area wiring segregated when wiring

isolators, whether un-enclosed or within enclosures. 5. Do not use chemical cleaning solvents.

DOC: ADHT-Ex.-6.1.1

Page 7 MOUNTING THE MTL 2441B ISOLATOR/REPEATER Clip the MTL 2441B onto type T35 DIN rail, with the blue signal plugs facing towards the hazardous area wiring. To remove an isolator from the rail, insert a screwdriver into one of the sliding clips and lever the clip gently outwards. Pivot the isolator off the rail. WIRING THE MTL 2441B ISOLATOR/REPEATER Depending on the installation, it may be easier to wire up the isolator with the power and signal plugs in place, or removed. In either case, allow sufficient free cable to easily permit plug removal for future operations. Making connections:- a. Trim back the insulation of conductors by 12mm. b. Check the terminal assignments shown on drawing 1000. c. Insert the conductors according to the terminal assignments and tighten the screws. NOTE. If wiring is to be fitted with crimp ferrules, the trimmed conductor length should be 14mm. DOC: ADHT-Ex.-7.1.1

Page 8 OPERATION / MAINTENANCE The Model ADHT-Ex is designed to operate continuously and, providing that care has been taken with the initial installation, as discussed in pages 2 & 3 of this manual, the amount of routine maintenance necessary can be kept to a minimum. It is advisable to periodically check that the correct pressures and flows are applied to the transmitters and that any filters installed are cleaned, drained or replaced as necessary. Calibration verification of the transmitter output and sensor response curve is recommended at 12 monthly intervals. If, for any reason, it is necessary to replace a Model ADHT-Ex, any other Model ADHT-Ex of the same measuring range is fully interchangeable. DOC: ADHT-Ex..8.1.1

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

Material

ASSOCIATED DRAWINGS

DRAWING No.

940MTL 5042. Connection Details2

DLC

12.12.01

12345-8 -91112 -

1314

d.c.+ -

User Connections Sensor Cable

1 Sensor Output + Blue2 Sensor Supply + Red3 Common - Green11 mA Output -12 mA Output +13 Power Supply -14 Power Supply +

BlueRedGreen

Sensor Output +Sensor Supply +Common -

_+

_+Power Supply20 to 35V dc

4/20 mA Output

DIN Rail Mounting

MTL 5042Repeater Power Supply

110

(4.3

5”)

16(0.63”) 104 (4.1”)

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

Material

ASSOCIATED DRAWINGS

DRAWING No.

942MTL 5042 ,ADHT-Ex & IS Indicator. Installation Schematic2

DLC

12.12.01

_+

_+Power Supply

20 to 35V dc

4/20 mA Output

MTL5042

ModelADHT-Ex

Safe Area Hazardous Area

940 Connection Details

Loop Powered I.S. Indicator

BlueRedGreen

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

Material

ASSOCIATED DRAWINGS

DRAWING No.

943MTL 5042 ,ADHT-Ex & DS-1000 Indicator. Installation Schematic

2

DLC

12.12.01

_+

Power Supply20 to 35V dc

MTL

5042

ModelADHT-Ex

Safe Area Hazardous Area

940 Connection Details

BlueRedGreen

Power Supply 90/250V ac 50/60Hz(24V dc to special order)

DS-1000 Display

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

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ASSOCIATED DRAWINGS

DRAWING No.

1000

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

+_

PowerSupply

+_

4/20mAOutput

Sensor Output +Common -

Sensor Supply + RedBlueGreen

MTL 2441B 4/20mArepeater power supply

MTL 2441B Termination Details

1

DLC

12.12.01

DIN Rail Mounting

OBSERVE POWER SUPPLY RATING ON MTL 2441B

110mm (4.3”) 50mm (1.95”)

75m

m (2

.95”

)

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

Material

ASSOCIATED DRAWINGS

DRAWING No.

1001

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

+_

PowerSupply

+_

4/20mAOutput

MTL 2441B 4/20mArepeater power supply

1

DLC

12.12.01

MTL 2441B & ADHT-Ex. Installation Schematic

BlueRed

Green

ModelADHT-Ex

Hazardous Area Safe Area

OBSERVE POWER SUPPLY RATING ON MTL 2441B

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

Material

ASSOCIATED DRAWINGS

DRAWING No.

1002

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

+_

PowerSupply

+_

4/20mAOutput

MTL 2441B 4/20mArepeater power supply

1

DLC

12.12.01

MTL 2441B, ADHT-Ex & I.S. Indicator. Installation Schematic

BlueRedGreen

Loop Powered I.S. Indicator

ModelADHT-Ex

Hazardous Area Safe Area

OBSERVE POWER SUPPLY RATING ON MTL 2441B

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

Material

ASSOCIATED DRAWINGS

DRAWING No.

1003

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

+_

PowerSupply

MTL 2441B 4/20mArepeater power supply

1

DLC

12.12.01

MTL 2441B, ADHT-Ex & DS-1000 Indicator. Installation Schematic

BlueRed

Green

ModelADHT-Ex

Hazardous Area Safe Area

DS-1000 Display

OBSERVE POWER SUPPLY RATING ON MTL 2441B

TITLE

Issue DateAuthRev

Date

Auth

DateAuthRev

Mods Mods

Material

ASSOCIATED DRAWINGS

DRAWING No.

1

2

3

4

5

6

7

Red +

Green -

Blue +

24V dc Supply

4/20mA Output

USER CONNECTIONS

Pin Function Colour

1. 24V dc + Red 3. Common - Green 7. mA Output + Blue

Cable SocketInside view of solder buckets

Important NoteDo not make connections to anyunidentified pins

Sensor Connection Socket

Locking Collar

Sensor Cable (ADHT-Ex)

Boot-Lace Ferrules

Model ADHT-Ex. Cable Assembly. User Connetions

2DLC

12.12.01

1008