Vaisala DMT346 User Manual

USER'S GUIDE

Vaisala DRYCAP® Dewpoint 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 Mounting Plate ........................	25
Wall Mounting with Wall Mounting Kit.................................	26
Mounting with DIN Rail Installation Kit ................................	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 Mounting Instructions.......	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 Wiring .........................................	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 Activation State ....................................	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 Protocol .....................................................	86
Web Configuration for LAN and WLAN...............................	86
Terminal Program Settings .................................................	87
Opening a Serial/USB Connection.................................	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 Message .........................................	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 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............................................................	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 AND ADJUSTMENT.........................................................	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 Using Serial 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

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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 Kit .....................................	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 Cooling Fins........	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 Connections, Part 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 Availability.....................................................................	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 Protocol ........................................................	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 Stabilization ............................................................	155
Figure 76 Proceeding with T d/f Adjustment ............................................		155
Figure 77 Completing T d/f Adjustment....................................................		156
Figure 78 Dewpoint Measurement Accuracy Graph DMT345................		161
Figure 79 Dewpoint Measurement Accuracy Graph DMT346................		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 Wool...................................................		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 Resolution........................................	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	Modbus Diagnostics ...............................................................	183
Table 54	Modbus Device Identification..................................................	184
Table 55	Modbus Exception Responses ...............................................	184

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Chapter 1 _________________________________________________________ General Information

CHAPTER 1

GENERAL INFORMATION

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.

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-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
	Manual Code		Description
	M210726EN-G		June 2014. This manual. Added Sensor Saturation
			Rate (SSR) and Sensor Temperature (Ts) to the list
			of Modbus registers, corrected the screenshot in
			completing T d/f adjustment, small corrections.
	M210726EN-F		December 2013. Previous version. Added new
			command descriptions: ALSEL, AOVER, CON,
			DSEND, and MODS. Updated FILT command
			description. Updated technical specification. Various
			small corrections.
	M210726EN-E		Applicable from transmitter software version 5.10
			onward. Added Modbus protocol. Updated serial
			line command descriptions. Updated storage
			temperature range.

Related Manuals

Table 2		Related Manuals
	Manual Code		Manual Name
	M010091EN		Vaisala DRYCAP® Hand-Held Dewpoint Meter
			DM70 User's Guide
	M210185EN		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.

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Chapter 1 _________________________________________________________ General Information

NOTE Note highlights important information on using the product.

Safety

		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:
	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,
	lead to malfunction, or make the product noncompliant with applicable
	legislation.

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.

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Recycling

Recycle all applicable material.

Dispose of the unit according to statutory regulations. Do not dispose of with regular household refuse.

Regulatory Compliances

EU Declaration of Conformity

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 Interface

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

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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 NMB003 du Canada.

Patent Notice

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.

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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 OVERVIEW

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 = TSensor) of the cooled Vaisala DRYCAP® sensor. Because the 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.

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Table 3	Output Quantities for DMT345
Quantity		Abbreviation	Metric Unit	Non-Metric Unit
Dewpoint/frost point temperature (Td/f )		TDF	ºC	ºF
Mixing ratio (x)		X	g/kg	gr/lb
Relative humidity RH		RH	%RH	%RH
Temperature T		T	ºC	ºF

Table 4	Optional Output Quantities and for DMT345
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		ANTP	g/m3	gr/ft3
temperature (NTP)
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 Td/f (∆T)		DT	ºC	ºF

Table 5	Output Quantities for DMT346
Quantity		Abbreviation	Metric Unit	Non-Metric Unit
Dewpoint temperature (Td/f)		TDF	ºC	ºF
Mixing ratio (x)		X	g/kg	gr/lb
Sensor saturation rate		SSR	%	-
Sensor temperature		TS	ºC	ºF

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Basic Features and 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.

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Structure of the Transmitter

1104-001

Figure 1 Transmitter Body

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

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Chapter 2 ___________________________________________________________ Product Overview

0604-006

Figure 2 Inside the Transmitter

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.

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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.

*) = Optional mounting flange for DMT345 probe

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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 without Mounting

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

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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

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)
			(0.41)	6.5 (0.26)	4.5 (0.18)	8.5 (0.33)	(0.24)
116 (4.57)	104 (4.09)	84 (3.30)	10.5			59 (2.32)	Thickness
							9.5 (0.37)
				59 (2.32)			Ø6.2

0804-065

Figure 6 Dimensions of the Plastic Mounting Plate (mm/inch)

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Chapter 3 ________________________________________________________________ Installation

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

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.

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0604-012

Figure 8 Dimensions of the Metal Mounting Plate (in mm)

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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

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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

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)

0604-015

Figure 11 Horizontal Pole Installation

The following numbers refer to Figure 11 above: 1 = Mounting nuts M8 (4 pcs)

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