Vaisala DMT346 User Manual
USER'S GUIDE
Vaisala DRYCAP® Dewpo int Transmitters
DMT345 and DMT346
M210762EN-G
PUBLISHED BY
Vaisala Oyj Phone (int.): +358 9 8949 1
P.O. Box 26 Fax: +358 9 8949 2227
FI-00421 Helsinki
Finland
Visit our Internet pages at www.vaisala.com.
© Vaisala 2014
No part of this manual may be reproduced, published or publicly displayed in any form
or by any means, electronic or mechanical (including photocopying), nor may its
contents be modified, translated, adapted, sold or disclosed to a third party without prior
written permission of the copyright holder. Translated manuals and translated portions
of multilingual documents are based on the original English versions. In ambiguous
cases, the English versions are applicable, not the translations.
The contents of this manual are subject to change without prior notice.
This manual does not create any legally binding obligations for Vaisala towards
customers or end users. All legally binding obligations and agreements are included
exclusively in the applicable supply contract or the General Conditions of Sale and
General Conditions of Service of Vaisala.
_________________________________________________________________________________
Table of Contents
CHAPTER 1
GENERAL INFORMATION .......................................................................... 13
About This Manual ................................................................. 13
Contents of This Manual ..................................................... 13
Version Information ............................................................. 14
Related Manuals ................................................................. 14
Documentation Conventions ............................................... 14
Safety ....................................................................................... 15
ESD Protection .................................................................... 15
Recycling ................................................................................ 16
Regulatory Compliances ....................................................... 16
EU Declaration of Conformity .............................................. 16
Transmitters with LAN or WLAN Interface .......................... 16
Transmitters with WLAN Interface ...................................... 17
Patent Notice .......................................................................... 17
Trademarks ............................................................................. 17
Software License .................................................................... 18
Warranty .................................................................................. 18
CHAPTER 2
PRODUCT OVERVIEW ................................................................................ 19
Introduction to DMT345 and DMT346 ................................... 19
Basic Features and Options ................................................ 21
Operating Principle .............................................................. 21
Structure of the Transmitter ................................................ 22
Probes and Cooling Set ...................................................... 24
CHAPTER 3
INSTALLATION ............................................................................................ 25
Selecting Location ................................................................. 25
Mounting the Housing ........................................................... 25
Standard Mounting without Moun t ing Pla te ........................ 25
Wall Mounting with Wall Mounting Kit ................................. 26
Mounting with DIN Rail Installation Ki t ................................ 29
Pole Installation with Installation Kit for Pole or Pipeline .... 30
Mounting Rain Shield with Installation Kit ........................... 31
Panel Mounting Frame ........................................................ 31
DMT345 Probe Mounting ....................................................... 33
Installation with Flange ........................................................ 33
DMT346 Probe and Cooling Set Mounting........................... 34
Description of the Cooling Set ............................................. 35
Parts of the Cooling Set ................................................. 36
General Probe and Cooling Set Mount ing Inst ruc ti ons ....... 37
Probe and Cooling Set Mounting with Process Shut
Down .............................................................................. 39
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Probe and Cooling Set Mounting with Process
Running .......................................................................... 39
Removing the Transmitter for Maintenance ................... 39
Wiring ....................................................................................... 40
Cable Bushings ................................................................... 40
Cable Grounding ................................................................. 41
Transmitter Housing Grounding .......................................... 42
Signal and Power Supply W iring ......................................... 42
Connections to a 24 VAC Power Supply ............................. 44
Optional Modules.................................................................... 45
Power Supply Module.......................................................... 45
Installation ...................................................................... 46
Warnings ........................................................................ 47
Galvanic Isolation of Power Supply ..................................... 50
Third Analog Output ............................................................ 50
Installation and Wiring .................................................... 51
Alarm Relays ....................................................................... 52
Installation and Wiring .................................................... 52
Selecting Relay Activatio n Stat e .................................... 52
RS-422/485 Interface .......................................................... 53
Installation and Wiring .................................................... 54
LAN Interface ....................................................................... 58
WLAN Interface ................................................................... 59
Attaching the WLAN Antenna......................................... 60
Data Logger Module ............................................................ 60
8-Pin Connector ................................................................... 62
CHAPTER 4
OPERATION ................................................................................................. 63
Getting Started ........................................................................ 63
Display/Keypad ....................................................................... 64
Basic Display ....................................................................... 64
Graphic History .................................................................... 65
Menus and Navigation ......................................................... 67
Changing the Language ................................................. 68
Rounding Setting ............................................................ 68
Display Backlight Setting ................................................ 68
Display Contrast Setting ................................................. 69
Using Display/Keypad ............................................... 69
Using Serial Line ....................................................... 69
Keypad Lock (Keyguard) ................................................ 69
Menu PIN Lock ............................................................... 70
Factory Settings ................................................................... 70
Display Alarms ..................................................................... 71
Configuring a Display Alarm ........................................... 72
Using Serial Line ............................................................ 73
MI70 Link Program for Data Handling .................................. 75
Serial Line Communication ................................................... 76
User Port Connection .......................................................... 77
User Port Operating Modes ............................................ 77
Service Port Connection ...................................................... 78
Connection Cables ......................................................... 78
Installing the Driver for the USB Cable .......................... 78
Using the Service Port .................................................... 79
LAN Communication .............................................................. 80
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IP Configuration .................................................................. 80
Using Display/Keypad .................................................... 81
Using Serial Line ............................................................ 82
Wireless LAN Configuration ................................................ 83
Using Display/Keypad .................................................... 84
Using Serial Line ............................................................ 85
Communication Protoco l ..................................................... 86
Web Configuration for LAN and WLAN ............................... 86
Terminal Program Settings ................................................. 87
Opening a Serial/USB Connectio n ................................. 88
Opening a Telnet Session (LAN/WLAN) ........................ 89
List of Serial Commands ..................................................... 90
Getting Measurement Message from Serial Line ................ 93
Starting Continuous Outputting ...................................... 93
R ................................................................................ 93
Stopping Continuous Outputting .................................... 93
S ................................................................................ 93
Outputting Reading Once .............................................. 94
Assign an Alias for the SEND Command ...................... 94
Outputting Reading Once From All Transmitters ........... 95
Communicating with a Transmitter in POLL Mode ............. 95
OPEN ............................................................................. 95
CLOSE ........................................................................... 95
Formatting Serial Line Mess age ......................................... 96
FTIME and FDATE......................................................... 96
FST................................................................................. 96
General Settings ..................................................................... 97
Changing Quantities and Units ........................................... 97
Using Display/Keypad .................................................... 97
Using Serial Line ............................................................ 98
FORM ............................................................................. 98
UNIT ............................................................................. 100
Pressure Compensation Setting ....................................... 100
Using Display/Keypad .................................................. 101
Using Buttons on Motherboard .................................... 101
Using Serial Line .......................................................... 102
XPRES and PRES .................................................. 102
Date and Time ................................................................... 103
Using Display/Keypad .................................................. 103
Using Serial Line .......................................................... 103
Data Filtering ..................................................................... 104
FILT .............................................................................. 105
Device Information ............................................................ 106
? ................................................................................... 106
LIGHT ........................................................................... 107
HELP ............................................................................ 108
ERRS ........................................................................... 108
MODS .......................................................................... 108
VERS ........................................................................... 109
Resetting the Device ......................................................... 109
Locking Menu/Keypad Using Serial Line .......................... 109
LOCK ........................................................................... 109
Serial Output Settings .......................................................... 110
Using Display/Keypad ....................................................... 110
Using Serial Line ............................................................... 111
SERI ............................................................................. 111
SMODE ........................................................................ 112
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ADDR ........................................................................... 112
INTV ............................................................................. 113
SDELAY ....................................................................... 113
ECHO ........................................................................... 113
Data Recording ..................................................................... 114
Selecting Data Recording Quantities ................................ 114
DSEL ............................................................................ 114
View Recorded Data .......................................................... 115
DIR ............................................................................... 115
PLAY ............................................................................ 116
Deleting Recorded Files .................................................... 117
UNDELETE .................................................................. 117
Analog Output Settings ....................................................... 118
Changing Output Mode and Range ................................... 118
Analog Output Quantities .................................................. 119
AMODE/ASEL .............................................................. 120
Analog Output Tests .......................................................... 121
ITEST ........................................................................... 121
Analog Output Fault Indication Setting .............................. 122
AERR ............................................................................ 122
Extend Analog Output Range ............................................ 123
Operation of Relays .............................................................. 123
Quantity for Relay Output .................................................. 123
Measurement-Based Relay Output Modes ....................... 123
Relay Setpoints ............................................................ 123
Hysteresis ..................................................................... 125
Relay Indicating Transmitter Error Status ......................... 125
Enabling/Disabling Re lays ................................................. 127
Indication Led Operation ................................................... 127
Setting Relay Outputs........................................................ 127
RSEL ............................................................................ 128
Testing Operation of Relays .............................................. 130
RTEST .......................................................................... 130
Sensor Functions ................................................................. 131
AutoCal .............................................................................. 131
Automatic AutoCal ........................................................ 131
Manual AutoCal ............................................................ 131
Sensor Purge ..................................................................... 132
Starting and Configuring Sensor Purge............................. 133
Using Display/Keypad (Optional) ................................. 133
Using Serial Line .......................................................... 134
PURGE .................................................................... 134
PUR ......................................................................... 134
Sensor Warming ................................................................ 135
CHAPTER 5
MODBUS .................................................................................................... 137
Overview of Modbus Protocol Support .............................. 137
Taking Modbus into Use .................................................... 138
Enabling Serial Modbus ....................................................... 139
Using Display/Keypad (Optional) ...................................... 139
Using Serial Line ............................................................... 139
Enabling Ethernet Modbus .................................................. 140
Using Display/Keypad (Optional) ...................................... 140
Using Serial Line ............................................................... 142
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Diagnostic Modbus Counters ............................................. 143
Viewing Counters Using Display/Keypad .......................... 143
Viewing Counters Using Service Port ............................... 143
Disabling Modbus ................................................................ 144
CHAPTER 6
MAINTENANCE ......................................................................................... 145
Periodic Maintenance .......................................................... 145
Cleaning ............................................................................ 145
Changing the Cooling Set Filter ........................................ 145
Error States ....................................................................... 146
Technical Support ................................................................ 148
Product Returns ................................................................... 148
CHAPTER 7
CALIBRATION AN D ADJU STMENT ......................................................... 149
Calibration ............................................................................. 149
User Calibration and Adjustment ...................................... 149
Opening and Closing Adjustment Mode ........................... 150
Adjustment Information ..................................................... 151
CTEXT and CDATE ..................................................... 151
Two-Point Relative Humidity Adjustment .......................... 152
Using Display/Keypad ....................................................... 152
Using Serial Line ............................................................... 153
FCRH ........................................................................... 153
One-Point Dewpoint Adjustment ........................................ 155
One-Point Dewpoint Adjustment Using Display/Keypad .. 155
One-point Dewpoint Adjustment Using Serial Line ........... 156
Adjusting Temperature ........................................................ 157
Adjusting Temperature Using Display/Keypad ................. 157
Adjusting Temperature Using Serial Line ......................... 158
CT................................................................................. 158
Adjusting Analog Outputs ................................................... 159
Adjusting Analog Outputs Using Display/Keypad ............. 159
Adjusting Analog Outputs Us ing Seri al Line ..................... 160
ACAL ............................................................................ 160
CHAPTER 8
TECHNICAL DATA .................................................................................... 161
Specifications ....................................................................... 161
Performance ...................................................................... 161
Technical Specifications of Optional Modules .................. 166
Power Supply Module .................................................. 166
Analog Output Module ................................................. 166
Relay Module ............................................................... 166
RS-485 Module ............................................................ 167
LAN Interface Module .................................................. 167
WLAN Interface Module ............................................... 167
Data Logger Module..................................................... 167
Spare Parts and Accessories .............................................. 168
Dimensions (mm/inch) ......................................................... 169
VAISALA _________________________________________________________________________ 7
User's Guide _______________________________________________________________________
APPENDIX A
EXAMPLE INSTALLATION OF DMT346 .................................................. 171
APPENDIX B
CALCULATION FORMULAS ..................................................................... 173
APPENDIX C
MODBUS REFERENCE ............................................................................. 177
Function Codes..................................................................... 177
Register Map ......................................................................... 178
Data Encoding ................................................................... 178
32-Bit Floating Point Format ......................................... 178
16-Bit Integer Format ................................................... 179
Measurement Data (Read-Only) ....................................... 180
Status Registers (Read-Only) ........................................... 181
Configuration Registers ..................................................... 181
Exception Status Outputs .................................................... 182
Diagnostic Sub-Functions ................................................... 183
Device Identification Objects .............................................. 184
Exception Responses .......................................................... 184
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List of Figures
Figure 1 Transmitter Body ...................................................................... 22
Figure 2 Inside the Transmitter ............................................................... 23
Figure 3 Probes, Cooling Set ................................................................. 24
Figure 4 Standard Mounting ................................................................... 25
Figure 5 Mounting with Wall Mounting Kit .............................................. 26
Figure 6 Dimensions of the Plastic Mounting Plate (mm/inch) ............... 26
Figure 7 Mounting with Metal Wall Mounting Plate ................................ 27
Figure 8 Dimensions of the Metal Mounting Plate (in mm) .................... 28
Figure 9 Mounting with DIN Rail Installation Ki t ..................................... 29
Figure 10 Vertical Pole Installation ........................................................... 30
Figure 11 Horizontal Pole Installation ....................................................... 30
Figure 12 Mounting the Rain Shield with Installation Kit .......................... 31
Figure 13 Panel Mounting Frame ............................................................. 32
Figure 14 Panel Mounting Dimensions (mm/inch) ................................... 32
Figure 15 DMT345 Probe Dimensions (mm/inch) .................................... 33
Figure 16 Flange Installation Kit ............................................................... 33
Figure 17 DMT346 Probe Dimensions (in mm) ........................................ 34
Figure 18 Cooling Set Dimensions (in mm) .............................................. 35
Figure 19 Measurement Ranges with and without the C oo ling F in s ........ 36
Figure 20 Parts of the Cooling Set (Dimensions in mm) .......................... 36
Figure 21 Mounting Flange Dimensions (in mm) ..................................... 37
Figure 22 Installing the Probe through Process Wall ............................... 38
Figure 23 Installing Probe through Thick Walls ........................................ 38
Figure 24 Cable Bushings ........................................................................ 40
Figure 25 Grounding the Screen of Electrical Cable ................................ 41
Figure 26 Screw Terminal Block on the Motherboard .............................. 42
Figure 27 Connections to 24 VAC Power Supply ..................................... 44
Figure 28 Power Supply Module .............................................................. 45
Figure 29 Galvanic Isolation Module ........................................................ 50
Figure 30 Third Analog Output ................................................................. 50
Figure 31 Third Analog Output Selection ................................................. 51
Figure 32 Relay Module ........................................................................... 53
Figure 33 RS-422/485 Module ................................................................. 54
Figure 34 4-Wire RS-485 Bus Conn e c tions, Par t A ................................. 56
Figure 35 2-Wire RS-485 Bus .................................................................. 57
Figure 36 LAN Interface Module ............................................................... 58
Figure 37 WLAN Interface Module ........................................................... 59
Figure 38 Data Logger Module ................................................................. 61
Figure 39 Pinout of the Optional 8-Pin Connector .................................... 62
Figure 40 Basic Display ............................................................................ 64
Figure 41 Graphical Display ..................................................................... 65
Figure 42 Graphical Display with Data Logger ......................................... 66
Figure 43 Main Views ............................................................................... 67
Figure 44 Alarm Limit Shown on Graph Screen ....................................... 71
Figure 45 Display Alarm Active ................................................................ 71
Figure 46 Display Alarms ......................................................................... 72
Figure 47 Modifying an Alarm Limit .......................................................... 73
Figure 48 Service Port Connector and User Port Terminal on the
Motherboard ............................................................................. 76
Figure 49 Connection Example between PC Serial Port and User Port .. 77
Figure 50 Network Interface Menu ........................................................... 81
Figure 51 IP Configuration Menu .............................................................. 81
Figure 52 Wireless LAN Settings .............................................................. 84
Figure 53 Entering Network SSID ............................................................ 84
Figure 54 Selecting the Wireless Network Type ...................................... 84
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Figure 55
Web Configuration Interface for WLAN .................................... 87
Figure 56 Opening a Serial Connection .................................................... 88
Figure 57 Opening a Telnet Connection ................................................... 89
Figure 58 Pressure Set Buttons on Motherboard ................................... 101
Figure 59 Device Information on Display ................................................ 106
Figure 60 Current/Voltage Switches of Output Modules ........................ 118
Figure 61 Measurement-Based Relay Output Modes ............................ 124
Figure 62 FAULT/ONLINE STATUS Relay Output Modes ..................... 126
Figure 63 Relay Availa b i lity..................................................................... 128
Figure 64 Following AutoCal on the Display ........................................... 132
Figure 65 Sensor Purge Settings ............................................................ 133
Figure 66 Performing Sensor Purge ....................................................... 133
Figure 67 Serial Interface Settings ......................................................... 139
Figure 68 IP Configuration ...................................................................... 141
Figure 69 Wireless LAN Settings ............................................................ 141
Figure 70 Communication Protoco l ........................................................ 141
Figure 71 Modbus Counters ................................................................... 143
Figure 72 Error Indicator and Error Message ......................................... 146
Figure 73 Inserting the Sensor in Reference Humidity 1 ........................ 152
Figure 74 Waiting for Readings to Stabilize ............................................ 152
Figure 75 Following Stabilizatio n ............................................................ 155
Figure 76 Proceeding with T
Figure 77 Completing T
Adjustment ............................................ 155
d/f
Adjustment .................................................... 156
d/f
Figure 78 Dewpoint Measurement Accuracy Graph DMT345 ................ 161
Figure 79 Dewpoint Measurement Accuracy Graph DMT 346 ................ 163
Figure 80 DMT345/346 Transmitter Body Dimensions .......................... 169
Figure 81 WLAN Antenna Dimensions ................................................... 170
Figure 82 Cooling Set Installation ........................................................... 171
Figure 83 Insulation with Mineral W ool ................................................... 172
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List of Tables
Table 1 Manual Revisions ..................................................................... 14
Table 2 Related Manuals ...................................................................... 14
Table 3 Output Quantities for DMT345 ................................................. 20
Table 4 Optional Output Quantities and for DMT345 ............................ 20
Table 5 Output Quantities for DMT346 ................................................. 20
Table 6 Connecting Twisted Pair Wires to Screw Terminals ............... 55
Table 7 4-Wire (Switch 3: On) ............................................................... 56
Table 8 2-Wire (Switch 3: Off) ............................................................... 57
Table 9 Observation Periods and Res olut io n ........................................ 60
Table 10 Wiring of the Optional 8-Pin Connector .................................... 62
Table 11 Periods for Trend and Max/Min Calculations ........................... 65
Table 12 Graph Information Messages ................................................... 66
Table 13 ALSEL Parameters ................................................................... 74
Table 14 Default Serial Communication Settings for User Port .............. 77
Table 15 Communication Settings for the Service Port .......................... 79
Table 16 IP Settings for the LAN and WLAN Interfaces ......................... 80
Table 17 Wireless LAN Settings .............................................................. 83
Table 18 Measurement Commands ........................................................ 90
Table 19 Formatting Commands ............................................................. 90
Table 20 Data Recording Commands ..................................................... 91
Table 21 Purge Commands .................................................................... 91
Table 22 Autocalibration Commands ...................................................... 91
Table 23 Calibration and Adjustment Commands ................................... 91
Table 24 Setting and Testing the Analog Outputs .................................. 91
Table 25 Setting and Testing the Relays ................................................ 91
Table 26 Other Commands ..................................................................... 92
Table 27 FORM Command Modifiers...................................................... 99
Table 28 Conversion Factors for Pressure Units .................................. 102
Table 29 Filtering Levels ....................................................................... 104
Table 30 Selection of Output Modes ..................................................... 112
Table 31 Relay State Examples ............................................................ 127
Table 32 Supported Modbus Variants ................................................... 137
Table 33 Error Messages ...................................................................... 147
Table 34 Indicator Led Functions .......................................................... 150
Table 35 Dewpoint Specifications DMT345 .......................................... 161
Table 36 Temperature Specifications DMT345 ..................................... 162
Table 37 Relative Humidity Specifications DMT345 ............................. 162
Table 38 Mixing Ratio Specifications DMT345 ..................................... 162
Table 39 Dewpoint Specifications DMT346 .......................................... 162
Table 40 Mixing Ratio Specifications DMT346 ..................................... 163
Table 41 Operating Environment Specifications (Both Models) ........... 163
Table 42 Inputs and Outputs Specifications (Both Models) .................. 164
Table 43 Mechanics Specifications (Both Models) ............................... 165
Table 44 Standard Probe Cable Lengths and Approximate Transmitter
Weight (in kg/lb) ..................................................................... 165
Table 45 Spare Parts and Accessories ................................................. 168
Table 46 Supported Function Codes..................................................... 177
Table 47 DMT345/346 Modbus Register Blocks ................................... 178
Table 48 Measurement Data Registers................................................. 180
Table 49 Status Registers ..................................................................... 181
Table 50 Configuration Parameter Registers ........................................ 181
Table 51 Configuration Flag Registers .................................................. 182
Table 52 Exception Status Outputs ....................................................... 182
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Table 53
Table 54 Modbus Device Identification .................................................. 184
Table 55 Modbus Exception Responses ............................................... 184
Modbus Diagnostics ............................................................... 183
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Chapter 1 _________________________________________________________ General Information
CHAPTER 1
GENERAL INFORM ATION
This chapter provides general notes for the manual and the product.
About This Manual
This manual provides information for installing, operating, and
maintaining Vaisala DRYCAP® Dewpoint Transmitters DMT345 and
DMT346.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the manual
and the product.
- Chapter 2, Product Overview, introduces the features and advantages
of the Vaisala DRYCAP® Dewpoint Transmitters DMT345 and
DMT346.
- Chapter 3, Installation, provides you with information that is intended
to help you install this product.
- Chapter 4, Operation, contains information that is needed to operate
this product.
- Chapter 5, Modbus, contains information that is needed when
operating the transmitter using the Modbus protocol.
- Chapter 6, Maintenance, provides information that is needed in basic
maintenance of the product. Possible error states and situations, their
probable causes and remedies are described in this chapter. This
chapter also contains contact information for Vaisala Technical
Support.
- Chapter 7, Calibration and Adjustment, provides you with instructions
on how to calibrate and adjust Vaisala DRYCAP® Dewpoint
Transmitters DMT345 and DMT346.
- Chapter 8, Technical Data, provides the technical data of the product.
- Appendix A, Example Installation of DMT346, illustrates an example
installation of DMT346 transmitter into a process.
VAISALA ________________________________________________________________________ 13
User's Guide _______________________________________________________________________
Manual Code
Description
M210726EN-G
June 2014. This manual. Added Sensor Saturation
completing T
d/f
adjustment, small corrections.
M210726EN-F
December 2013. Previous vers io n. Added new
small corrections.
M210726EN-E
Applicable from transmitter software version 5.10
temperature range.
Manual Code
Manual Name
M010091EN
Vaisala DRYCA P® Hand-Held Dewpoint Meter
DM70 User's Guide
M210185EN
Humidity Calibrator HMK15 User's Guide
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
death.
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.
- Appendix B, Calculation Formulas, contains the formulas used for the
calculated output quantities.
- Appendix C, Modbus Reference, describes the Modbus functions and
data of the transmitter.
Version Information
Table 1 Manual Revisions
Rate (SSR) and Sensor Temperature (Ts) to the list
of Modbus registers, corrected the screenshot in
command descriptions: ALSEL, AOVER, CON,
DSEND, and MODS. Updated FILT command
description. Updated technical specification. Various
onward. Added Modbus protocol. Updated serial
line command descriptions. Updated storage
WARNING
CAUTION
Related Manuals
Table 2 Related Manuals
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
or even
14 ___________________________________________________________________ M210762EN-G
Chapter 1 _________________________________________________________ General Information
Note highlights important information on using the
Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
Do not modify the unit. Improper modification can damage the product,
lead to malfunction, or make the product noncompliant with applicable
legislation.
NOTE
Safety
WARNING
CAUTION
product.
The DMT345/346 Dewpoint and Temperature Transmitter delivered to
you has been tested for safety and approved as shipped from the factory.
Note the following precautions:
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. However, it is possible to damage the product
by delivering electrostatic discharges when touching, removing, or
inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground yourself
to the equipment chassis before touching the boards. Ground yourself
with a wrist strap and a resistive connection cord. When neither of the
above is possible, touch a conductive part of the equipment chassis
with your other hand before touching the boards.
- Always hold the boards by the edges and avoid touching the
component contacts.
VAISALA ________________________________________________________________________ 15
User's Guide _______________________________________________________________________
Recycle all applicable material.
Dispose of the unit according to statutory regulations. Do not dispose of
with regular household refuse.
Recycling
Regulatory Compliances
EU Declaration of Confo rmity
Vaisala DRYCAP® Humidity and Temperature Transmitters DMT345
and DMT346 are in conformity with the provisions of the following EU
directives:
- Low Voltage Directive
- EMC-Directive
Conformity is shown by compliance with the following standards:
- EN 60950-1
- 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.
Transmitters with LAN or WLAN Interfa ce
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful
interference in a residential installation. Operation is subject to the
following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that
may cause undesired operation of the device.
This equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions, may
16 ___________________________________________________________________ M210762EN-G
Chapter 1 _________________________________________________________ General Information
cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by one or more of
the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Transmitters with WLAN Interface
This device has been designed to operate with a 2 dBi half-wave antenna.
Antennas with a gain greater than 2 dBi are prohibited for use with this
device. The antenna impedance is 50 ohms.
To reduce potential radio interference to other users, the antenna type and
its gain should be so chosen that the equivalent isotropically radiated
power (EIRP) is not more than that permitted for successful
communication.
This Class [B] digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe [B] est conforme à la norme NMB-
003 du Canada.
Patent Notic e
Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 are
protected by, for example, the following patents and their corresponding
national rights:
Finnish patents 98861 and 99164, French patents 6650303 and 9504397,
German patents 69418174 and 19513274, Japanese patents 3585973 and
2801156, UK patents 0665303 and 2288465, and U.S. patent 5607564.
Trademarks
DRYCAP® is a registered trademark of Vaisala Oyj.
All other trademarks are the property of their respective owners.
VAISALA ________________________________________________________________________ 17
User's Guide _______________________________________________________________________
Software License
This product contains software developed by Vaisala. Use of the software
is governed by license terms and conditions included in the applicable
supply contract or, in the absence of separate license terms and
conditions, by the General License Conditions of Vaisala Group.
Warranty
Visit our Internet pages for standard warranty terms and conditions:
www.vaisala.com/warranty.
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.
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Chapter 2 ___________________________________________________________ Product Overview
CHAPTER 2
PRODUCT OVERVIE W
This chapter introduces the features and advantages of the Vaisala
DRYCAP® Dewpoint Transmitters DMT345 and DMT346.
Introduction to DMT345 and DMT346
The DMT345 and DMT346 transmitters incorporate the advanced
Vaisala DRYCAP® technology, which enables reliable and accurate
dewpoint measurement. Both transmitters also feature the AutoCal
function which provides excellent long term stability of the
measurement.
The DMT345 is designed for measurement of relative humidity in
temperatures up to 180 °C. The transmitter outputs dewpoint/frostpoint
(Td/f), mixing ratio (x), volume concentration (ppm), relative humidity
(RH), and temperature (T).
The DMT346 is a high-performance instrument for measurement of
dewpoint and mixing ratio in temperatures up to 350 °C.
DMT346 also outputs sensor saturation rate (SSR) and temperature
(TS = T
sensor is cooled, these values do not represent true process conditions,
hence they cannot be used for process control. Nevertheless, they provide
a valuable aid for calibration and for checking the cooling effect.
For quantities measured by DMT345, see Table 3 on page 20. For the
optional calculated quantities measured by DMT345, see Table 4 on page
20.
For quantities measured and calculated by DMT36, see Table 5 on page
20.
) of the cooled Vaisala DRYCAP® sensor. Because the
Sensor
VAISALA ________________________________________________________________________ 19
User's Guide _______________________________________________________________________
Quantity
Abbreviation
Metric Unit
Non-Metric Unit
Dewpoint/frost point temperature (T
d/f
)
TDF
ºC
ºF
Mixing ratio (x)
X
g/kg
gr/lb
Relative humidity RH
RH
%RH
%RH
Temperature T
T
ºC
ºF
Quantity
Abbreviation
Metric Unit
Non-Metric Unit
Parts per million
H2O
ppmv/ ppmw
ppmv/ ppmw
Absolute humidity (a)
A
g/m3
gr/ft3
Absolute humidity in standard pressure and
temperature (NTP)
ANTP
g/m3
gr/ft3
Wet bulb temperature (Tw)
TW
ºC
ºF
Water vapor pressure (Pw )
PW
hPa
lb/in2
Water vapor saturation pressure (Pws)
PWS
hPa
lb/in2
Enthalpy (h)
H
kJ/kg
Btu/lb
Difference of T and T
d/f
(∆T)
DT
ºC
ºF
Quantity
Abbreviation
Metric Unit
Non-Metric Unit
Dewpoint temperature (T
d/f
)
TDF
ºC
ºF
Mixing ratio (x)
X
g/kg
gr/lb
Sensor saturation rate
SSR
% - Sensor temperature
TS
ºC
ºF
Table 3 Output Quantities for DMT345
Table 4 Optional Output Quantities and for DMT345
Table 5 Output Quantities for DMT346
20 ___________________________________________________________________ M210762EN-G
Chapter 2 ___________________________________________________________ Product Overview
Basic Features an d Options
- Dewpoint measurement with AutoCal and sensor purge features
- Sensor warming in high humidities
- Two analog outputs and a serial interface, optional third analog output
- Installation accessories
- DMT345: mounting flange
- DMT346: cooling set for high temperature applications.
- User friendly display and keypad interface (optional)
- Different sensor protection options and probe cable lengths
- Support for Modbus serial communications protocol
- USB connectivity for service connections via the optional
USB-RJ45 cable
- Optional modules:
- Galvanic isolation for outputs
- Power supply module for AC mains power
- RS-422/485-module
- LAN and WLAN interfaces
- Data logger module with real time clock
- Additional analog output module
- Alarm relay module
Operating Principle
The DMT345/346 transmitter incorporates the Vaisala DRYCAP®
sensor together with a combined temperature measurement with a PT100
resistive temperature sensor. The operating principle of the DRYCAP®
sensor is based on the changes in capacitance as its thin polymer film
absorbs water molecules.
The DMT345/346 transmitter measures water vapor directly and gives
thus accurate results of moisture in the process. In DMT346, the sensor is
cooled down with a cooling set which makes it possible to use a polymer
sensor in very high temperatures, for example, +100 ... +350 °C. With
this technique, no complicated sampling systems are needed. The cooling
set is thermally isolated from the process itself. The temperature of the
sensor is cooled down which increases the sensor saturation rate.
Sensor saturation rate and temperature are then measured, and the
transmitter calculates the dewpoint and the mixing ratio on the basis of
those readings.
Note that for DMT346, SSR and temperature values do not represent the
process itself as they are measured after cooling. Dewpoint and mixing
ratio, however, are independent of temperature and remain unchanged.
The dewpoint measurement range is -25 ... +100 °C.
VAISALA ________________________________________________________________________ 21
User's Guide _______________________________________________________________________
The following numbers refer to Figure 1 above:
1 = Signal + powering cable gland
2 = Cable gland for optional module, or WLAN antenna connector
3 = Cable gland for optional module or AC mains cable
4 = Cover screw (4 pcs)
5 = Display with keypad (optional)
6 = Cover LED
Structure of the Transmitter
1104-001
Figure 1 Transmitter Body
22 ___________________________________________________________________ M210762EN-G
Chapter 2 ___________________________________________________________ Product Overview
The following numbers refer to Figure 2 above:
1 = Service port (RS-232)
2 = Dip switches for analog output settings
3 = Power supply and signal wiring screw terminals
4 = Relay, data logger, RS-422/485, LAN, or WLAN module
(optional)
5 = Grounding connector
6 = Power supply module (optional)
7 = Relay, data logger, or analog output module (optional)
8 = Dewpoint probe
9 = Galvanic isolation module (optional)
10 = Adjustment button and Manual AutoCal buttons with indicator
LED and pressure set buttons.
0604-006
Figure 2 Inside the Transmitter
VAISALA ________________________________________________________________________ 23
User's Guide _______________________________________________________________________
*) = Optional mounting flange for DMT345 probe
Probes and Cooling Set
0604-007
Figure 3 Probes, Cooling Set
Figure 3 above shows from left to right: DMT345 probe, DMT346 probe
and the cooling set. For probe cable lengths, see Table 44 on page 165.
24 ___________________________________________________________________ M210762EN-G
Chapter 3 ________________________________________________________________ Installation
CHAPTER 3
INSTALLATION
This chapter provides you with information that is intended to help you
install this product.
Selecting Location
Finding a suitable site for the dewpoint measurement probe is important
for getting representative process or environmental measurements. The
location of the probe should provide a good representation of the area of
interest. Also select a location that is as clean as possible. Air should
circulate freely around the sensor.
Mounting the Housing
The housing can be mounted either without the mounting plate or with
optional mounting plates.
Standard Mounting witho ut Mount ing Plate
Mount the housing without the mounting plate by fastening the
transmitter to the wall with 4 screws, for example, M6 (not provided).
0804-066
Figure 4 Standard Mounting
VAISALA ________________________________________________________________________ 25
User's Guide _______________________________________________________________________
The following numbers refer to Figure 5 above:
1 = Plastic mounting plate
2 = Mount the plate to wall with 4 screws M6 (not provided)
3 = Arched side up
4 = Fasten the transmitter to the mounting plate with 4 fixing
screws M3 (provided)
5 = Holes for wall/junction box mounting
183 (7.20)
133 (5.24)
116 (4.57)
104 (4.09)
84 (3.30)
59 (2.32)
59 (2.32)
Ø6.2 (0.24)
4.5 (0.18)
10.5 (0.41)
6.5 (0.26)
8.5 (0.33)
Thickness
9.5 (0.37)
Wall Mounting with Wall Mounting Kit
When mounting with wall mounting kit the mounting plate (Vaisala
order code: 214829) can be installed directly on wall or onto a standard
wall box (also US junction box). When wiring through back wall, remove
the plastic plug from the wiring hole in the transmitter before mounting.
0604-009
Figure 5 Mounting with Wall Mounting Kit
Figure 6 Dimensions of the Plastic Mounting Plate (mm/inch)
26 ___________________________________________________________________ M210762EN-G
0804-065
Chapter 3 ________________________________________________________________ Installation
The following numbers refer to Figure 7 above:
1 = Mount the plate to wall with 4 screws M8 (not provided)
2 = Fasten the transmitter to the mounting plate with 4 fixing screws
M6 (provided)
3 = Note the position of the arrow when mounting. This side must
be up when mounting.
Metal mounting plate is included in rain shield with installation kit and
installation kit for pole or pipeline.
0604-011
Figure 7 Mounting with Metal Wall Mounting Plate
VAISALA ________________________________________________________________________ 27
User's Guide _______________________________________________________________________
0604-012
Figure 8 Dimensions of the Metal Mounting Plate (in mm)
28 ___________________________________________________________________ M210762EN-G
Chapter 3 ________________________________________________________________ Installation
Mounting with DIN Rail Installation Kit
DIN rail installation kit includes a wall mounting kit, 2 clip-fasteners and
2 screws M4 × 10 DIN 7985 (Vaisala order code: 215094).
1. Attach two spring holders to the plastic mounting plate by using the
screws provided in the installation kit.
2. Fasten the transmitter to the plastic mounting plate with 4 screws
(provided).
3. Press the transmitter onto the DIN rail so that the clip-fasteners
snap into the rail.
0604-013
Figure 9 Mounting with DIN Rail Installation Kit
VAISALA ________________________________________________________________________ 29
User's Guide _______________________________________________________________________
The following numbers refer to Figure 10 above:
1 = U-bolts (2 pcs) M8 (provided) for 30 ... 102 mm poles.
2 = Mounting nuts M8 (4 pcs)
The following numbers refer to Figure 11 above:
1 = Mounting nuts M8 (4 pcs)
Pole Installation with Installation Kit for Pole or Pipeline
Installation kit for pole or pipeline (Vaisala order code: 215108) includes
the metal mounting plate and 4 mounting nuts for pole mounting. When
mounting, the arrow in the metal mounting plate must point upward, see
Figure 7 on page 27.
0604-014
Figure 10 Vertical Pole Installation
0604-015
Figure 11 Horizontal Pole Installation
30 ___________________________________________________________________ M210762EN-G
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