Vaisala DRYCAP DMT143 Bedienungsanleitung

Procedure Instruction 1(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Document Revision

Rev. Date Creator

Status

Reason

A 4/6/2018 JAMM First revision

General Product info

Introduction to DM 143

Vaisala DRYCAP® Dewpoint ransmitter DM 143 is a small and lightweight dewpoint transmitter

suitable for a wide range of OEM applications. DM 143 is easy to install and the mechanics have been

designed for harsh environments requiring protection against dust, dirt and splashed water.

here are two variants of the DM 143 transmitter, DM 143 and DM 143L.

DM 143 with DRYCAP® 180D sensor

•either G1/2” ISO228/1 or NP 1/2” mechanical connection

•measurement range -70 ... +60 °C (-94 ... +140 °F)

•operating pressure up to 50 bara (725 psia)

•voltage (V) or current (mA) analog output

DM 143L with DRYCAP® 180M sensor

•G1/2” ISO228/1 mechanical connection

•measurement range -70 ... + 60 °C° (-94 ... +140 °F)

•operating pressure 0 ... 20 bara (0 ... 290 psia)

•current (mA) analog output

DM 143L with DRYCAP® 180S sensor

•G1/2” ISO228/1 mechanical connection

•measurement range -50 ... + 60 °C° (-58 ... +140 °F)

•operating pressure 0 ... 20 bara (0 ... 290 psia)

•

current (mA) analog output

Procedure Instruction 2(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Table of Contents

General Product info ...............................................................................................................1

here are two variants of the DM 143 transmitter, DM 143 and DM 143L. .................1

able of Contents .............................................................................................................2

Service policy.....................................................................................................................3

ools needed.....................................................................................................................3

Wiring.................................................................................................................................4

rouble 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

Procedure Instruction 3(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Service policy

Full Calibration service capability in HEL, BOS, OK and BEI.

Additional three point temperature calibration is available for all models in HEL (MSL).

Customer selectable RH and points are available in HEL and BOS CRS

Accredited calibration is available for a new unit and the older ones too. Configuration of the

calibration is defined to order form of a new unit

Tools needed

- Power supply (V

Out

10...35V and I

Out

> 1A)

- Standard PC terminal software

- Vaisala USB service cable (order code 219690)

- Multimeters (DVMs)

Procedure Instruction 4(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Wiring

Property Description/Value

Recommended calibration interval

to confirm the specified accuracy

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

Pressure > 20 bara (290 psia) or temp below 0 °C (32°F), 24 … 28 VDC

Supply current

during normal measurement

during self-diagnostics

Max 10 mA + load current

Max 220mA pulsed during purge

Load for current output Max 500 Ohms

Load for voltage output in 10k Ohms

Procedure Instruction 5(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Trouble Shooting

4.1 Analog Output or Display does not match expected value

Step 1.) Check the label on transmitter, to verify the transmitter configuration of

parameters, engineering units and scale for appropriate channel.

Step 2.) With USB Service Cable, force analog outputs to 0% and 100% of scale to

verify reading on the control display, PLC, chart recorder, data logger or analog

receiving device displays correct scale.

Analog Output Tests

Using USB Service Cable and Service Port: ITEST Command

With the Pu Y serial program, use the A ES command to test the operation of the analog outputs. he

A ES command forces the analog outputs to entered values. he analog outputs remain at these values

until you enter the command A ES without parameters or reset the transmitter

Examples:

atest

17.585 24000

atest 4

4.000 5447

atest 20

20.000 27298

atest

17.583 27298

4.2 easurement Reading bounces around

If the measurement reading jumps around, this can be caused by several factors. Factors include unstable

process, varying control conditions, wrong location for sensor placement, ground loops, and leaks in

system allowing environmental conditions to affect process.

First, check the location of the installed sensor is not obstructed intermittently or insulated properly from

ambient fluctuations.

Procedure Instruction 6(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Second, your process may fluctuate greatly. ry adjusting Filtering on control device in an effort to

stabilize readings. Or try adjusting FILT command with USB Service Cable for DM 143 output filtering

response

Set D T143 easurement Filtering

Use the FILT command to view or set the speed at which the latest measurement result is integrated into

the output readings. he 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 without averaging

0.5 = Average of last two measurements

0.1 = Average of ca. 16 measurements (default)

Example (show current setting):

filt

Filter : 0.100 ?

Example (set filtering to 0.5):

filt 0.5

Filter : 0.500

4.3 Checking Error essages with Service Port

If the transmitter has error messages, they can be read on the serial line using the ERRS command.

Example (one active error, caused by physical damage to the sensor):

errs

MEAS error

Procedure Instruction 7(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Solving Typical Problems

Some problems can be solved by simply resetting power to the transmitter or issuing the RESE

command using the service port.

able 2. roubleshooting able

If resetting does not help, and if the problem is related to transmitter software or settings, you can

restore the factory configuration of the transmitter by issuing the FRESTORE command. If you are

unable to solve your problem with the transmitter, contact Vaisala technical support.

Procedure Instruction 8(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

4.4 Checking Error essages with Service Port

If the transmitter has error messages, they can be read on the serial line using the ERRS command.

Example (one active error, caused by physical damage to the sensor):

errs

MEAS error

4.5 Operational 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 serial line to Service port (fixed serial line settings, 19200, 8, N, 1) and multimeters (DVMs)

to analog outputs. Run Pu Y.

Power up the unit.

After power up the unit should response:

DM 143 1.3.4

ype command ? and hit enter

DM 143 1.3.4

Serial number : M3104715

Batch number : M18551904

Sensor number : L3820000

Sensor model : DRYCAP180D

Cal. date : 20160804

Procedure Instruction 9(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Cal. info : Vaisala/HEL

ime : 02:20:19

Serial mode : S OP

SCI Baud P D S : 19000 N 8 1

Output interval : 1 s

Serial delay : 8

Address : 0

Pressure : 1.000 bar

Filter : 0.100

ype command R

he unit starts showing the readings. Pressing ESC <EN ER> stops displaying the readings.

Check the readings are reasonable and corresponds to the display (optional) and to the

analog outputs.

RH= 37.33 % = 67.66'F

RH= 37.34 % = 67.66'F

Example:

>asel

If the 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 information needs to be change from one parameter to another, use following

procedure.

Use the ASEL command to show or set the output parameter and the scaling of the analog output.

ASEL [parameter] [lowlimit highlimit]<cr>

where

parameter = Parameter that is output on analog channel.

Available parameters are TDF, TDFA, H2O. If the transmitter has been ordered from Vaisala

with a relative humidity output on the analog channel, also parameter RH is available.

lowlimit = Lower limit of parameter scaling.

highlimit = Higher limit of parameter scaling.

Procedure Instruction 10(16)

Field Tech Manual for DMT143-series

2018-04-06

Vaisala Instruments

Example (show current settings):

asel

Ch1 df lo : -80.00 'C ?

Ch1 df 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 configuration

o reset the transmitter settings to factory defaults, use command FRES ORE.

>frestore

Factory settings restored

4.8 Thread Types

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