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Procedure Instruction 

 

 

2(16) 

 

 

Field Tech Manual for DMT143-series 

 

 

 

2018-04-06 

 

Vaisala Instruments 

 

 

 

 

 

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Table of Contents

 

General Product info

 ............................................................................................................... 1

 

There are two variants of the DMT143 transmitter, DMT143 and DMT143L.

 ................. 1

 

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Table of Contents

 ............................................................................................................. 2

 

 

Service policy

 ..................................................................................................................... 3

 

 

Tools needed

 ..................................................................................................................... 3

 

 

Wiring

 ................................................................................................................................. 4

 

 

Trouble Shooting

 .............................................................................................................. 5

 

4.1

 

Analog Output or Display does not match expected value

 ................................................... 5

 

4.2

 

Measurement Reading bounces around

 .................................................................................. 5

 

4.3

 

Checking Error Messages with Service Port

 ............................................................................. 6

 

4.4

 

Checking Error Messages with Service Port

 ............................................................................. 8

 

4.5

 

Operational tests using USB Service Cable and Service Port

 ................................................. 8

 

4.6

 

Changing Output Parameter and Channel information

 ......................................................... 9

 

4.7

 

Reset to factory ordered configuration

 .................................................................................. 10

 

4.8

 

Thread Types ................................................................................................................................ 10

 

 

Maintenance

 .................................................................................................................... 11

 

5.1

 

Visual Check

 ................................................................................................................................ 11

 

5.2

 

Cleaning the HUMICAP sensor

 ................................................................................................ 11

 

 

Spare or Replacement parts available for customers

 ................................................ 12

 

 

CALIBRATION AND ADJUSTMENT........................................................................... 13

 

 

DMT143 Order Codes ...................................................................................................... 15

 

 

Calculate mA and Process Values .................................................................................... 16

 

 
 
 
 

 

Summary of Contents for DMT143L

Page 1: ...protection against dust dirt and splashed water There are two variants of the DMT143 transmitter DMT143 and DMT143L DMT143 with DRYCAP 180D sensor either G1 2 ISO228 1 or NPT1 2 mechanical connection...

Page 2: ...value 5 4 2 Measurement Reading bounces around 5 4 3 Checking Error Messages with Service Port 6 4 4 Checking Error Messages with Service Port 8 4 5 Operational tests using USB Service Cable and Servi...

Page 3: ...libration is available for all models in HEL MSL Customer selectable RH and T points are available in HEL and BOS CRS Accredited calibration is available for a new unit and the older ones too Configur...

Page 4: ...acy 2 years Current Output Signal 4 20 mA Operating voltage with current output with voltage output with RS 485 18 28 VDC 12 28 VDC 12 28 VDC Pressure 20 bara 290 psia or temp below 0 C 32 F 24 28 VDC...

Page 5: ...the PuTTY serial program use the ATEST command to test the operation of the analog outputs The ATEST command forces the analog outputs to entered values The analog outputs remain at these values until...

Page 6: ...esult is integrated into the output readings The command affects both analog output and serial line output FILT a aaa cr where a aaa Range 0 001 1 0 1 0 No filtering latest measurement is output witho...

Page 7: ...he transmitter or issuing the RESET command using the service port Table 2 Troubleshooting Table If resetting does not help and if the problem is related to transmitter software or settings you can re...

Page 8: ...tests using USB Service Cable and Service Port CAUTION Before AC power up Connect always first the protective ground terminal After that connect phase and null wires to POWER 1 module Connect USB ser...

Page 9: ...analog output readings are incorrect those can be re calibrated with command ACAL see the instructions from User s Guide 4 6 Changing Output Parameter and Channel information If a transmitter channel...

Page 10: ...Ch1 Tdf lo 80 00 C Ch1 Tdf hi 20 00 C Example change output parameter to H2O set low and high limits asel h2o 0 5000 Ch1 H2O lo 0 00 ppm Ch1 H2O hi 5000 00 ppm 4 7 Reset to factory ordered configurati...

Page 11: ...erse the transmitter in liquid and do not use cleaning agents or solvents When replacing the filter wear clean gloves to avoid depositing dirt or oil on the filter Inspect the sealing ring for damage...

Page 12: ...Procedure Instruction 12 16 Field Tech Manual for DMT143 series 2018 04 06 Vaisala Instruments Spare or Replacement parts available for customers...

Page 13: ...3 to the MI70 indicator NOTE In the procedure below the readings of the transmitter and the reference probe are checked simultaneously You can also check the reference probe and the DMT143 separately...

Page 14: ...MI70 8 After the measurement has stabilized check the difference between the readings It will give you an indication of the approximate drift of the DMT143 and its need for calibration The difference...

Page 15: ...Procedure Instruction 15 16 Field Tech Manual for DMT143 series 2018 04 06 Vaisala Instruments DMT143 Order Codes...

Page 16: ...V span PVhigh PVlow 20 80 100 Deg C Display Reading 40 Td deg C Calculate PV offset 40 80 40 I span PV span 16 100 0 16 Span x PV offset PVlow 0 16 x 40 4 10 40 mA To find the Process Value from mA PV...

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