Vaisala DMT143 User Manual

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 DMT143
Vaisala DRYCAP® Dewpoint Transmitter DMT143 is a small and lightweight dewpoint transmitter
suitable for a wide range of OEM applications. DMT143 is easy to install and the mechanics have been
designed for harsh environments requiring 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
• measurement range -70 ... +60 °C (-94 ... +140 °F)
• operating pressure up to 50 bara (725 psia)
• voltage (V) or current (mA) analog output
DMT143L 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
DMT143L 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

Vaisala DMT143 Specifications

General

Brand	Vaisala
Model	DMT143
Category	Transmitter
Language	English

Summary

General Product Information

Service Policy

Tools Needed

Wiring

Trouble Shooting

Analog Output or Display does not match expected value

Verifies analog output scaling and receiving device accuracy.

Measurement Reading bounces around

Addresses causes like unstable process, sensor placement, or leaks.

Checking Error Messages with Service Port

Explains how to read and interpret error messages using the ERRS command.

Operational tests using USB Service Cable and Service Port

Guides on performing operational tests via service port and USB cable.

Changing Output Parameter and Channel information

Details how to modify output parameters and channel scaling using ASEL.

Reset to factory ordered configuration

Describes resetting the transmitter to factory defaults using FRESTORE.

Thread Types

Illustrates installation procedures for ISO and NPT thread types.

Maintenance

Visual Check

Outlines checks for surface condition, oxidation, leaks, sensors, and cables.

Cleaning the HUMICAP sensor

Provides instructions for cleaning the sensor and replacing the filter.

Spare or Replacement parts available for customers

CALIBRATION AND ADJUSTMENT

Field Check Using the DM70 Hand-Held Dewpoint Meter

Explains the procedure for field checking the transmitter using the DM70 meter.

DMT143 Order Codes

Calculate mA and Process Values