Vaisala HUMICAP DMT132 User manual

USER'S GUIDE
Vaisala HUMICAP® Dewpoint Transmitte
r
DMT132
M211289EN-A

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FI-00421 Helsinki
Finland
Visit our Internet pages at www.vaisala.com.
© Vaisala 2011
No part of this manual may be reproduced in any form or by any means, electronic or
mechanical (including photocopying), nor may its contents be communicated to a third
party without prior written permission of the copyright holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or Conditions of
Sale.

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Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................5
About This Manual...................................................................5
Contents of This Manual.......................................................5
Version Information...............................................................6
Related Manuals...................................................................6
Documentation Conventions.................................................6
Safety.........................................................................................7
ESD Protection......................................................................7
Recycling ..................................................................................7
Regulatory Compliances.........................................................8
Patent Notice ............................................................................8
Trademarks...............................................................................8
Warranty....................................................................................8
CHAPTER 2
PRODUCT OVERVIEW..................................................................................9
Introduction to DMT132...........................................................9
Basic Features and Options..................................................10
Transmitter Structure.............................................................11
LED Indicator Plug (Optional)...............................................12
Special Cover Set for HMK15 (Optional)..............................13
NPT Adapter (Optional)..........................................................14
Loop-Powered Display (Optional) ........................................15
Connection Cables.................................................................16
Sampling Accessories...........................................................17
CHAPTER 3
INSTALLATION............................................................................................19
Selecting the Location...........................................................19
Installing the Transmitter .....................................................20
Wiring ......................................................................................23
Power Supply Requirements...............................................24
Sampling from a Process......................................................24
Sampling Accessories...........................................................25
DMT242SC Sampling Cell..................................................25
DMT242SC2 Sampling Cell with Swagelok Connectors ....25
DSC74 Sampling Cell with Quick Connector and
Leak Screw..........................................................................26
DSC74B Two-Pressure Sampling Cell ...............................27
DSC74C Two-Pressure Sampling Cell with Coil ...........29
DM240FA Duct Installation Flange................................31

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CHAPTER 4
OPERATION.................................................................................................33
Getting Started........................................................................33
Serial Communication............................................................33
Connecting to the Serial Interface.......................................33
Installing the Driver for the USB Service Cable .............33
Terminal Application Settings..............................................34
List of Serial Commands .......................................................36
Device Information and Status..............................................37
Show Device Information ....................................................37
Show Available Quantities...................................................37
Show Firmware Version......................................................37
Show Software Information.................................................38
Configuring Analog Output...................................................38
Set Analog Output Quantity and Scaling.............................38
Set Analog Output Error Notification...................................39
Configuring Measurement Parameters ................................40
Set Pressure Value for Dewpoint Calculation.....................40
Serial Line Output Commands..............................................41
Output a Reading Once.......................................................41
Troubleshooting and Maintenance Commands..................41
Display Currently Active Errors ...........................................41
Test Analog Output..............................................................42
Set LED Indicator Level.......................................................42
Calibration and Adjustment Commands..............................43
Calibrate Humidity Measurement........................................43
Calibrate Temperature Measurement .................................44
Adjust Capacitance Measurement ......................................45
View User Adjustment Parameters .....................................46
Set User Adjustment Parameters........................................46
Other Commands ...................................................................47
Display Command List ........................................................47
Reset Transmitter................................................................47
Restore Factory Settings.....................................................48
CHAPTER 5
MAINTENANCE............................................................................................49
Cleaning the Transmitter.......................................................49
Changing the Filter.................................................................49
Changing the Sensor .............................................................51
Calibration and Adjustment...................................................52
Field Check Using DM70.....................................................53
Humidity Calibration and Adjustment (RHCAL) ..................55
Temperature Calibration and Adjustment (CT)...................58
Capacitance Adjustment (CRH)..........................................60
CHAPTER 6
TROUBLESHOOTING..................................................................................63
Typical Problems....................................................................63
Error State...............................................................................64
Error Codes.............................................................................65

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Technical Support..................................................................66
Product Returns.....................................................................66
CHAPTER 7
TECHNICAL DATA......................................................................................67
Specifications.........................................................................67
Performance........................................................................67
Measured Variables.......................................................67
Calculated Variables......................................................68
Operating Environment.......................................................68
Inputs and Outputs..............................................................68
General................................................................................68
Output Cable Specifications .................................................69
Spare Parts and Accessories................................................69
Dimensions in mm .................................................................70

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List of Figures
Figure 1 Vaisala HUMICAP®Dewpoint Transmitter DMT132................10
Figure 2 DMT132 Transmitter Structure.................................................11
Figure 3 DMT132 with LED Indicator Plug .............................................12
Figure 4 Special Cover Set for HMK15...................................................13
Figure 5 DMT132 with NPT Adapter.......................................................14
Figure 6 Nokeval 301 Loop-Powered Display ........................................15
Figure 7 Cable with Threaded Connector...............................................16
Figure 8 USB Service Cable...................................................................16
Figure 9 Removing the Transport Protection Cap..................................20
Figure 10 Installing the Transmitter..........................................................20
Figure 11 Tightening by Hand ..................................................................21
Figure 12 Tightening with the Plastic Wrench ..........................................21
Figure 13 Connecting the Cable and LED Indicator Plug.........................22
Figure 14 Connectors I and II...................................................................23
Figure 15 Connector Pinout......................................................................23
Figure 16 Sampling Cells DMT242SC2 (left) and DMT242SC (right)......26
Figure 17 DSC74 Sampling Cell with Accessories...................................27
Figure 18 DSC74B....................................................................................28
Figure 19 Removing the Leak Screw........................................................28
Figure 20 Default Assembly of DSC74C ..................................................29
Figure 21 Alternative Assembly of DSC74C (for Tight Spaces)...............30
Figure 22 DM240FA with DMT132...........................................................31
Figure 23 PuTTY Terminal Application.....................................................35
Figure 24 Opening the Filter.....................................................................50
Figure 25 Filter Structure..........................................................................50
Figure 26 Removing the HUMICAP® 180R Sensor.................................51
Figure 27 Calibrating DMT132 Using HMK15 and USB Cable ................55
Figure 28 Accuracy Over Temperature Range.........................................67
Figure 29 DMT132 Dimensions................................................................70
Figure 30 Dimensions with NPT Adapter and LED Plug..........................70
List of Tables
Table 1 Manual Revisions.......................................................................6
Table 2 Related Manuals.........................................................................6
Table 3 Quantities Output by the DMT132..............................................9
Table 4 Connector Pinouts....................................................................23
Table 5 DMT132 Serial Interface Settings.............................................34
Table 6 DMT132 Serial Commands......................................................36
Table 7 Pressure Conversion Coefficients............................................40
Table 8 Error Codes ..............................................................................65

Chapter 1 ________________________________________________________ General Information
VAISALA________________________________________________________________________ 5
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the manual and the DMT132.
About This Manual
This manual provides information for installing, operating, and
maintaining the Vaisala HUMICAP® Dewpoint Transmitter DMT132.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the manual
and the DMT132.
- Chapter 2, Product Overview, introduces the features, options, and
accessories of the DMT132.
- Chapter 3, Installation, provides you with information that is intended
to help you install the DMT132.
- Chapter 4, Operation, contains information that is needed to operate
the DMT132.
- Chapter 5, Maintenance, provides information that is needed in basic
maintenance of the DMT132.
- Chapter 6, Troubleshooting, describes common problems, their
probable causes and remedies, and provides contact information for
technical support.
- Chapter 7, Technical Data, provides the technical data of the
DMT132.

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Version Information
Table 1 Manual Revisions
Manual Code Description
M211289EN-A March 2011. This manual. First version.
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M211288EN Vaisala HUMICAP Dewpoint Transmitter DMT132
Quick Guide
M210185EN Vaisala Humidity Calibrator HMK15 User’s Guide
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
WARNING Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or even
death.
CAUTION Caution warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged or
important data could be lost.
NOTE Note highlights important information on using the product.

Chapter 1 ________________________________________________________ General Information
VAISALA________________________________________________________________________ 7
Safety
The Vaisala HUMICAP®Dewpoint Transmitter DMT132 delivered to
you has been tested for safety and approved as shipped from the factory.
Note the following precautions:
WARNING Ground the product and verify outdoor installation grounding
periodically to minimize shock hazard.
CAUTION Do not modify the unit. Improper modification can damage the product
or lead to malfunction.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage to
electronic circuits. Vaisala products are adequately protected against
ESD for their intended use. It is possible to damage the product,
however, by delivering electrostatic discharges when touching ESD
sensitive components or transmitter connectors.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench.
- When an ESD workbench is not available, ground yourself with a
wrist strap and a resistive connection cord.
Recycling
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations. Do
not dispose of with regular household refuse.

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Regulatory Compliances
The Vaisala HUMICAP®Dewpoint Transmitter DMT132 is in
conformity with the provisions of the following EU directive(s):
- EMC-Directive (2004/108/EC)
Conformity is shown by compliance with the following standards:
- EN 61326-1: Electrical equipment for measurement, control, and
laboratory use – EMC requirements – for use in industrial locations.
- EN 550022: Information technology equipment – Radio disturbance
characteristics – Limits and methods of measurement.
Patent Notice
The Vaisala HUMICAP®Dewpoint Transmitter DMT132 is protected by
the following patents and patent applications and their corresponding
national rights:
Finnish patent 98861, French patent 6650303, German patent 69418174,
Japanese patent 3585973, UK patent 0665303, U.S. patent 5607564.
Trademarks
Vaisala HUMICAP®is a registered trademark of Vaisala Oyj.
Windows® is a registered trademark of Microsoft Corporation in the
United States and/or other countries.
Warranty
Visit our Internet pages for more information and our standard warranty
terms and conditions: www.vaisala.com/services/warranty.html.
Please observe that any such warranty may not be valid in case of
damage due to normal wear and tear, exceptional operating conditions,
negligent handling or installation, or unauthorized modifications. Please
see the applicable supply contract or Conditions of Sale for details of the
warranty for each product.

Chapter 2 __________________________________________________________ Product Overview
VAISALA________________________________________________________________________ 9
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, options, and accessories of the
DMT132.
Introduction to DMT132
The Vaisala HUMICAP® Dewpoint Transmitter DMT132 measures
dewpoint temperature accurately in a measurement range -20 ... +50 °C
(-4 ... +122 °F) Td. The DMT132 is designed for OEM applications that
require dewpoint measurement in this range, such as refrigeration dryers.
The transmitter is easy to install, and the mechanics have been designed
for harsh environments requiring protection against dust, dirt, and
splashed water.
The excellent stability and reliability of the transmitter’s performance is
based on advanced HUMICAP® polymer sensor technology. The
HUMICAP® technology has low maintenance needs due to its excellent
long term stability and durability against condensation.
Table 3 Quantities Output by the DMT132
Quantity Abbreviation Metric
Unit Non Metric Unit
Dewpoint/frost point temperature Td/f ºC ºF
Dewpoint/frost point temperature in
atmospheric pressure Td/f atm ºC ºF
Dewpoint temperature (Td/f ) is the primary quantity measured by the
DMT132. Dewpoint temperature in atmospheric pressure (Td/f atm) is a
calculated quantity that presents the dewpoint the gas would have at
atmospheric pressure. For this calculation to provide accurate results, it is
important to have the correct pressure setting stored in the transmitter.
This setting is specified on the order form, and it can be changed using
the service port. See section Set Pressure Value for Dewpoint Calculation
on page 40.
NOTE When dewpoint is below 0 °C, the transmitter outputs frostpoint for Td.

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1101-047
Figure 1 Vaisala HUMICAP®Dewpoint Transmitter DMT132
Basic Features and Options
- Dewpoint measurement range -20 ... +50 °C (-4 ... +122 °F) Td.
- Output in Td/f or Td/f atm (calculated quantity).
- HUMICAP® polymer sensor .
- Small size to fit in tight installations.
- One scalable 2-wire current loop output, 4 ... 20 mA.
- Configurable analog output level for error notification.
- Field check suitability with MI70 hand-held indicator.
- Optional accessories:
- USB service cable for configuration and calibration.
- LED indicator plug that enables a visual indication of
transmitter status: LED lit when dewpoint is above set limit,
blinking for malfunction alarm.
- Special cover set for HMK15 Humidity Calibrator
- Adapter for mounting on NPT 1/2" threaded mounting points.
- Loop-powered display.
- Various sampling cells with different installation options.

Chapter 2 __________________________________________________________ Product Overview
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Transmitter Structure
The structure of the DMT132 is shown in Figure 2 on page 11. The
transmitter body does not have user serviceable parts inside, and is not
designed to be opened. Opening the transmitter will void the warranty.
1101-083
Figure 2 DMT132 Transmitter Structure
where
1 = 30 mm nut
2 = Transmitter body
3 = 4-pin M8 connector I: analog output and operating power
4 = 4-pin M8 connector II (shown with protective cap):
Connection for service port (RS-485, service use only ) and
LED indicator plug
5 = Sealing ring (included with every transmitter)
6 = Connection thread (ISO G1/2")
7 = Tube filter that protects the HUMICAP® and Pt1000 sensors
When the transmitter is delivered, the filter is protected by a yellow
transport protection cap that keeps the sensor dry. The transport
protection cap should be left on the transmitter during storage. Remove
the transport protection cap before installing the transmitter.

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LED Indicator Plug (Optional)
The service port (connector II) of the DMT132 can be equipped with a
LED indicator plug (Vaisala order code 230388). The red LED on the
plug will light up when the measured dewpoint temperature is above the
set limit. If the transmitter is in error condition, the LED will blink.
1101-049
Figure 3 DMT132 with LED Indicator Plug
NOTE The dewpoint limit for the LED indication can be changed using the
service port; see section Serial Communication on page 33.

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Special Cover Set for HMK15 (Optional)
To use the Vaisala Humidity Calibrator HMK15 with the DMT132 you
need the special cover set (Vaisala order code 230914). The cover set
includes one salt jar cover where one of the holes is specially designed
for the DMT132, and rubber plugs for covering the unused holes.
The hole for DMT132 is raised higher than the others, and has an
ISO G 1/2" thread. The DMT132 can be mounted on the salt jar tightly
using the thread, and without having to remove the filter.
1103-036
Figure 4 Special Cover Set for HMK15

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NPT Adapter (Optional)
The DMT132 can be connected to NPT 1/2" threaded mounting points
using the optional NPT adapter (Vaisala order code 210662).
1101-061
Figure 5 DMT132 with NPT Adapter
NOTE When the NPT adapter is used, the filter is partially covered by the
adapter; see Figure 5 above. This doubles the response time of the
transmitter. The adapter is suitable for use in compressed air lines and
other systems with sufficient flow.

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VAISALA_______________________________________________________________________ 15
Loop-Powered Display (Optional)
The DMT132 can be connected to a loop-powered external LED display
(type Nokeval 301, Vaisala order code 226476). The display provides a
reading of the output quantity. The display is powered by the 4 ... 20 mA
current signal, so there is no need for an external power supply.
The display is delivered at its default settings. Configure the display
functions and scaling according to the documentation delivered with the
display.
1102-053
Figure 6 Nokeval 301 Loop-Powered Display
NOTE The loop resistance of the display must be included in the loop resistance
calculation for the complete current loop. See section Power Supply
Requirements on page 24. For the loop resistance of the display, refer to
the manufacturer’s documentation.

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Connection Cables
Vaisala supplies shielded cables with M8 female straight threaded
connector. Available in four lengths:
- 0.3 m (1.0 ft)
- 3 m (9.8 ft)
- 5 m (16.4 ft)
- 10 m (32.8 ft)
Also available are cables for service port and field check use:
- USB service cable
- MI70 connection cable
For the order codes of the cables, refer to section Spare Parts and
Accessories on page 69.
0910-135
Figure 7 Cable with Threaded Connector
0809-002
Figure 8 USB Service Cable

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Sampling Accessories
DMT132 is compatible with various sampling accessories. For more
information on performing sampling, and a description of the accessories,
see section Sampling Accessories on page 17.
For the order codes of the sampling accessories, refer to section Spare
Parts and Accessories on page 69.

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