Vaisala DRYCAP DMT345 User manual

USER'S GUIDE
Vaisala DRYCAP® Dewpoint Transmitters
DMT345 and DMT346
M210762EN-E

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FI-00421 Helsinki
Finland
Visit our Internet pages at http://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..........................................................................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 ................................................................................15
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
License Agreement................................................................17
Warranty..................................................................................18
CHAPTER 2
PRODUCT OVERVIEW................................................................................19
Introduction to DMT345 and DMT346...................................19
Basic Features and Options................................................20
Operating Principle..............................................................21
Structure of the Transmitter ................................................22
Probes and Cooling Set......................................................24
CHAPTER 3
INSTALLATION............................................................................................25
Selecting Location .................................................................25
Mounting the Housing ...........................................................26
Standard Mounting without Mounting Plate........................26
Wall Mounting with Wall Mounting Kit.................................27
Mounting with DIN Rail Installation Kit................................30
Pole Installation with Installation Kit for Pole or Pipeline ....31
Mounting Rain Shield with Installation Kit...........................32
Panel Mounting Frame........................................................32
DMT345 Probe Mounting.......................................................34
Installation with Flange........................................................34
DMT346 Probe and Cooling Set Mounting...........................35
Description of the Cooling Set.............................................36
Parts of the Cooling Set.................................................37
General Probe and Cooling Set Mounting Instructions.......38
Probe and Cooling Set Mounting with Process Shut
Down..............................................................................40

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Probe and Cooling Set Mounting with Process
Running..........................................................................40
Removing the Transmitter for Maintenance...................40
Wiring.......................................................................................41
Cable Bushings ...................................................................41
Cable Grounding .................................................................42
Transmitter Housing Grounding..........................................43
Signal and Power Supply Wiring.........................................43
Connections to a 24 VAC Power Supply.............................45
Optional Modules ...................................................................46
Power Supply Module .........................................................46
Installation......................................................................47
Warnings ........................................................................48
Galvanic Isolation for Output...............................................51
Third Analog Output ............................................................51
Installation and Wiring....................................................52
Alarm Relays.......................................................................53
Installation and Wiring....................................................53
Selecting Relay Activation State ....................................53
RS-422/485 Interface ..........................................................55
Installation and Wiring....................................................56
LAN Interface.......................................................................59
WLAN Interface...................................................................60
Attaching the WLAN Antenna ........................................61
Data Logger Module............................................................61
8-Pin Connector...................................................................64
CHAPTER 4
OPERATION.................................................................................................65
Getting Started........................................................................65
Display/Keypad.......................................................................66
Basic Display.......................................................................66
Graphic History....................................................................67
Menus and Navigation.........................................................69
Changing the Language.................................................70
Rounding Setting............................................................70
Display Backlight Setting................................................70
Display Contrast Setting.................................................71
Keypad Lock (Keyguard)................................................71
Menu PIN Lock...............................................................71
Factory Settings...................................................................72
Display Alarms.....................................................................72
Configuring a Display Alarm...........................................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..............................................................79
IP Configuration...................................................................80
Using Display/Keypad....................................................81
Using Serial Line............................................................82

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Wireless LAN Configuration................................................83
Using Display/Keypad....................................................84
Using Serial Line............................................................85
Communication Protocol.....................................................86
Web Configuration for LAN and WLAN...............................86
Terminal Program Settings .................................................87
Opening a Serial/USB Connection.................................87
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
Communicating with a Transmitter in POLL Mode.............95
OPEN.............................................................................95
CLOSE...........................................................................95
Formatting Serial Line Message .........................................96
FTIME and FDATE.........................................................96
FST ................................................................................97
General Settings.....................................................................98
Changing Quantities and Units ...........................................98
Using Display/Keypad....................................................98
Using Serial Line............................................................99
FORM.............................................................................99
UNIT.............................................................................100
Pressure Compensation Setting .......................................101
Using Display/Keypad..................................................101
Using Buttons on Motherboard....................................102
Using Serial Line..........................................................102
XPRES and PRES..................................................102
Date and Time...................................................................103
Using Display/Keypad..................................................103
Using Serial Line..........................................................104
Data Filtering.....................................................................104
FILT..............................................................................105
Device Information............................................................105
? ...................................................................................106
LIGHT...........................................................................107
HELP............................................................................107
ERRS...........................................................................108
VERS ...........................................................................108
Resetting the Device.........................................................108
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
ADDR...........................................................................112
INTV.............................................................................113
SDELAY.......................................................................113
ECHO...........................................................................113
Data Recording.....................................................................114

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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..................................................120
AMODE/ASEL..............................................................120
Analog Output Tests..........................................................121
ITEST ...........................................................................122
Analog Output Fault Indication Setting..............................122
AERR............................................................................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 Relays.................................................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............................................................132
Sensor Purge.....................................................................133
Starting and Configuring Sensor Purge ............................133
Using Display/Keypad (Optional).................................133
Using Serial Line..........................................................134
PURGE....................................................................134
PUR.........................................................................134
Sensor Warming................................................................136
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................................................141
Using Display/Keypad (Optional) ......................................141
Using Serial Line ...............................................................142
Diagnostic MODBUS Counters ...........................................144
Viewing Counters Using Display/Keypad..........................144
Viewing Counters Using Service Port ...............................144
Disabling MODBUS ..............................................................145

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CHAPTER 6
MAINTENANCE .........................................................................................147
Periodic Maintenance ..........................................................147
Cleaning............................................................................147
Changing the Cooling Set Filter........................................147
Error States.......................................................................148
Technical Support................................................................150
Product Returns...................................................................150
CHAPTER 7
CALIBRATION AND ADJUSTMENT.........................................................151
Calibration.............................................................................151
User Calibration and Adjustment ......................................151
Opening and Closing Adjustment Mode ...........................152
Adjustment Information.....................................................152
CTEXT and CDATE.....................................................152
Two-Point Relative Humidity Adjustment..........................153
Using Display/Keypad.......................................................153
Using Serial Line...............................................................154
FCRH...........................................................................154
One-Point Dewpoint Adjustment........................................156
One-Point Dewpoint Adjustment Using Display/Keypad ..156
One-point Dewpoint Adjustment Using Serial Line...........158
Adjusting Temperature........................................................159
Adjusting Temperature Using Display/Keypad .................159
Adjusting Temperature Using Serial Line .........................160
CT ................................................................................160
Adjusting Analog Outputs...................................................161
Adjusting Analog Outputs Using Display/Keypad.............161
Adjusting Analog Outputs Using Serial Line.....................162
ACAL............................................................................162
CHAPTER 8
TECHNICAL DATA....................................................................................163
Specifications.......................................................................163
Performance......................................................................163
Technical Specifications of Optional Modules ..................167
Power Supply Module..................................................167
Analog Output Module.................................................167
Relay Module...............................................................168
RS-485 Module............................................................168
LAN Interface Module ..................................................168
WLAN Interface Module...............................................168
Data Logger Module ....................................................169
Options and Accessories....................................................170
Dimensions (mm/inch).........................................................171
APPENDIX A
EXAMPLE INSTALLATION OF DMT346..................................................173
APPENDIX B
CALCULATION FORMULAS ....................................................................175

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APPENDIX C
MODBUS REFERENCE.............................................................................179
Function Codes.....................................................................179
Register Map.........................................................................180
Data Encoding...................................................................180
32-Bit Floating Point Format ........................................180
16-Bit Integer Format ...................................................181
Measurement Data (Read-Only).......................................182
Status Registers (Read-Only) ...........................................183
Configuration Registers.....................................................183
Exception Status Outputs....................................................184
Diagnostic Sub-Functions...................................................185
Device Identification Objects ..............................................186
Exception Responses..........................................................186

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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...................................................................26
Figure 5 Mounting with Wall Mounting Kit..............................................27
Figure 6 Dimensions of the Plastic Mounting Plate (mm/inch)...............27
Figure 7 Mounting with Metal Wall Mounting Plate................................28
Figure 8 Dimensions of the Metal Mounting Plate (in mm) ....................29
Figure 9 Mounting with DIN Rail Installation Kit.....................................30
Figure 10 Vertical Pole Installation...........................................................31
Figure 11 Horizontal Pole Installation.......................................................31
Figure 12 Mounting the Rain Shield with Installation Kit..........................32
Figure 13 Panel Mounting Frame.............................................................33
Figure 14 Panel Mounting Dimensions (mm/inch) ...................................33
Figure 15 DMT345 Probe Dimensions (mm/inch)....................................34
Figure 16 Flange Installation Kit...............................................................34
Figure 17 DMT346 Probe Dimensions (in mm)........................................35
Figure 18 Cooling Set Dimensions (in mm)..............................................36
Figure 19 Measurement Ranges with and without the Cooling Fins........37
Figure 20 Parts of the Cooling Set (Dimensions in mm)..........................37
Figure 21 Mounting Flange Dimensions (in mm) .....................................38
Figure 22 Installing the Probe through Process Wall...............................39
Figure 23 Installing Probe through Thick Walls........................................39
Figure 24 Cable Bushings........................................................................41
Figure 25 Grounding the Screen of Electrical Cable................................42
Figure 26 Screw Terminal Block on the Motherboard..............................43
Figure 27 Connections to 24 VAC Power Supply.....................................45
Figure 28 Power Supply Module ..............................................................46
Figure 29 Galvanic Output Isolation Module............................................51
Figure 30 Third Analog Output.................................................................51
Figure 31 Third Analog Output Selection.................................................52
Figure 32 Relay Module ...........................................................................54
Figure 33 RS-485 Module ........................................................................55
Figure 34 4-Wire RS-485 Bus Connections, Part A.................................57
Figure 35 2-Wire RS-485 Bus ..................................................................58
Figure 36 LAN Interface Module...............................................................60
Figure 37 WLAN Interface Module...........................................................61
Figure 38 Data Logger Module.................................................................63
Figure 39 Pinout of the Optional 8-Pin Connector....................................64
Figure 40 Basic Display............................................................................66
Figure 41 Graphical Display.....................................................................67
Figure 42 Graphical Display with Data Logger.........................................68
Figure 43 Main Views...............................................................................69
Figure 44 Alarm Limit Shown on Graph Screen.......................................73
Figure 45 Display Alarm Active ................................................................73
Figure 46 Display Alarms .........................................................................74
Figure 47 Modifying an Alarm Limit..........................................................74
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

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Figure 53 Entering Network SSID.............................................................84
Figure 54 Selecting the Wireless Network Type.......................................84
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...................................102
Figure 59 Device Information on Display...............................................105
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 Availability ....................................................................128
Figure 64 Following AutoCal on the Display...........................................132
Figure 65 Sensor Purge Settings............................................................133
Figure 66 Performing Sensor Purge.......................................................134
Figure 67 Serial Interface Settings .........................................................139
Figure 68 IP Configuration......................................................................141
Figure 69 Wireless LAN Settings............................................................141
Figure 70 Communication Protocol ........................................................142
Figure 71 MODBUS Counters................................................................144
Figure 72 Error Indicator and Error Message.........................................148
Figure 73 Inserting the Sensor in Reference Humidity 1........................153
Figure 74 Waiting for Readings to Stabilize............................................154
Figure 75 Following Stabilization............................................................156
Figure 76 Proceeding with T d/f Adjustment............................................157
Figure 77 Completing T d/f Adjustment....................................................157
Figure 78 Dewpoint Measurement Accuracy Graph DMT345................163
Figure 79 Dewpoint Measurement Accuracy Graph DMT346................165
Figure 80 DMT345/346 Transmitter Body Dimensions ..........................171
Figure 81 WLAN Antenna Dimensions...................................................172
Figure 82 Cooling Set Installation...........................................................173
Figure 83 Insulation with Mineral Wool...................................................174