USER'S GUIDE
Vaisala HUMIC AP ® Humi dit y and
Temperature Transmitter S eries
HMT330
M210566EN-K
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 http://www.vaisala.com/
© Vaisala 2013
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 .......................................................................... 11
About This Manual ................................................................. 11
Contents of This Manual ..................................................... 11
Version Information ............................................................. 12
Documentation Conventions ............................................... 12
Safety ....................................................................................... 13
ESD Protection .................................................................... 13
Recycling ................................................................................ 14
Regulatory Compliances ....................................................... 14
EU Declaration of Conformity .............................................. 14
DNV Type Approval ............................................................ 15
Transmitters with LAN or WLAN Interface .......................... 16
Transmitters with WLAN Interface ...................................... 16
Patent Notice .......................................................................... 17
Trademarks ............................................................................. 17
Software License .................................................................... 17
Warranty .................................................................................. 17
CHAPTER 2
PRODUCT OVERVIEW ................................................................................ 19
Introduction to HMT330 ......................................................... 19
Basic Features and Options ................................................ 20
Structure of the Transmitter ................................................ 21
Probe Options ..................................................................... 23
Warmed Probe HMT337 ..................................................... 25
Filter Options .......................................................................... 25
Catalytic VHP Filter ............................................................. 25
CHAPTER 3
INSTALLATION ............................................................................................ 27
Mounting the Housing ........................................................... 27
Standard Mounting without Moun t ing Pla te ........................ 27
Wall Mounting with Wall Mounting Kit ................................. 28
Mounting with DIN Rail Installation Kit ................................ 30
Pole Installation with Installation Kit for Pole or Pipeline .... 30
Mounting Rain Shield with Installation Kit ........................... 32
Panel Mounting Frame ........................................................ 33
Wiring ...................................................................................... 34
Cable Bushings ................................................................... 34
Grounding the Cables ......................................................... 35
Grounding the Transmitter Housing .................................... 36
Signal and Power Supply W iring ......................................... 37
Connections to a 24 VAC Power Supply ............................ 38
Probe Mounting ...................................................................... 40
VAISALA _________________________________________________________________________ 1
User's Guide _______________________________________________________________________
General Instructions for Probes with a Cable ...................... 41
HMT333 for Ducts and Tight Spaces .................................. 43
HMT334 for High Pressure and Vacuum Applications ........ 43
HMT335 for High Temperatures .......................................... 45
HMT337 for High Humidity Applications .............................. 46
Temperature Probe (Optional) ....................................... 46
HMT338 for Pressurized Pipelines ...................................... 46
Tightening the Clasp Nut ................................................ 48
Optional Modules.................................................................... 49
Power Supply Module.......................................................... 49
Installation ...................................................................... 50
Warnings ........................................................................ 51
Galvanic Isolation of the Power Supply ............................... 54
Third Analog Output ............................................................ 54
Installation and Wiring .................................................... 55
Relays .................................................................................. 56
Installation and Wiring .................................................... 56
Selecting the Activation State of the Relay .................... 56
RS-422/485 Interface .......................................................... 57
Installation and Wiring .................................................... 58
LAN Interface ....................................................................... 62
WLAN Interface ................................................................... 63
Attaching the WLAN Antenna......................................... 64
Data Logger Module ............................................................ 64
8-Pin Connector ................................................................... 66
CHAPTER 4
OPERATION ................................................................................................. 67
Getting Started ........................................................................ 67
Display/Keypad (Optional) ..................................................... 67
Basic Display ....................................................................... 67
Graphic History .................................................................... 68
Menus and Navigation ......................................................... 70
Changing the Language ................................................. 71
Rounding Setting ............................................................ 71
Display Backlight Setting ................................................ 71
Display Contrast Setting ................................................. 72
Using Display/Keypad ............................................... 72
Using Serial Line ....................................................... 72
Keypad Lock (Keyguard) ................................................ 73
Menu PIN Lock ............................................................... 73
Factory Settings ............................................................. 74
Configuring Display Alarms ................................................. 74
Using Display/Keypad .................................................... 75
Using Serial Line ............................................................ 77
MI70 Link Program for Data Handling .................................. 78
Serial Line Communication ................................................... 79
User Port Connection .......................................................... 80
User Port Operating Modes ............................................ 80
Service Port Connection ...................................................... 81
Connection Cables ......................................................... 81
Installing the Driver for the USB Cable .......................... 81
Using the Service Port .................................................... 82
LAN Communication .............................................................. 82
IP Configuration ................................................................... 83
Using Display/Keypad .................................................... 84
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Using Serial Line ............................................................ 85
Wireless LAN Configuration ................................................ 86
Using Display/Keypad .................................................... 87
Using Serial Line ............................................................ 88
Communication Protoco l ..................................................... 89
Web Configuration for LAN and WLAN ............................... 89
Terminal Program Settings ................................................. 90
Opening a Serial/USB connection ................................. 90
Opening a Telnet session (LAN/WLAN) ........................ 91
List of Serial Commands ....................................................... 93
Getting Measurement Message from Serial Line ................ 95
Starting Continuous Outputting ...................................... 95
Stopping Continuous Outputting .................................... 96
Outputting Reading Once .............................................. 96
Assign an Alias for the SEND Command ...................... 96
Outputting Reading Once From All Transmitters ........... 97
Communicating with a Transmitter in POLL Mode ............. 97
OPEN .................................................................................. 97
CLOSE ................................................................................ 97
Formatting Serial Line Message ........................................... 98
FTIME and FDATE .............................................................. 98
FST ...................................................................................... 99
General Settings ................................................................... 100
Changing Quantities and Units ......................................... 100
Using Display/Keypad .................................................. 100
Using Serial Line .......................................................... 101
FORM...................................................................... 101
UNIT ........................................................................ 103
Pressure Compensation Setting ....................................... 104
Using Display/Keypad .................................................. 104
Using Serial Line .......................................................... 104
PRES and XPRES .................................................. 104
Limit RH Output Range ..................................................... 105
Date and Time ................................................................... 106
Using Display/Keypad .................................................. 106
Using Serial Line .......................................................... 106
Data Filtering ..................................................................... 107
Using Display/Keypad .................................................. 107
Using Serial Line .......................................................... 107
Device Information ............................................................ 108
? ................................................................................... 109
LIGHT ........................................................................... 109
HELP ............................................................................ 110
ERRS ........................................................................... 110
MODS .......................................................................... 110
VERS ........................................................................... 111
Resetting Transmitter Using Serial Line ........................... 111
RESET ......................................................................... 111
Locking Menu/Keypad Using Serial Line .......................... 111
LOCK ........................................................................... 111
Serial Output Settings .......................................................... 112
Using Display/Keypad ....................................................... 112
Using Serial Line ............................................................... 113
SERI ............................................................................. 113
SMODE ........................................................................ 114
ADDR ........................................................................... 114
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User's Guide _______________________________________________________________________
INTV ............................................................................. 115
SDELAY ....................................................................... 115
ECHO ........................................................................... 115
Data Recording ..................................................................... 116
Selecting Data Recording Quantities ................................ 116
DSEL ............................................................................ 116
View Recorded Data .......................................................... 116
DIR ............................................................................... 116
PLAY ............................................................................ 118
Deleting the Recorded Files .............................................. 119
UNDELETE .................................................................. 119
Analog Output Settings ....................................................... 120
Changing Output Mode and Range ................................... 120
Analog Output Quantities .................................................. 121
AMODE/ASEL .............................................................. 122
Analog Output Tests .......................................................... 123
ITEST ........................................................................... 123
Analog Output Fault Indication Setting .............................. 124
AERR ............................................................................ 124
Extend Analog Output Range ............................................ 125
Operation of Relays .............................................................. 125
Quantity for Relay Output .................................................. 125
Measurement-Based Relay Output Modes ....................... 125
Relay Setpoints ............................................................ 125
Hysteresis ..................................................................... 127
Relay Indicating Transmitter Error Status ......................... 127
Enabling/Disabling Re lays ................................................. 129
Setting Relay Outputs........................................................ 129
RSEL ............................................................................ 130
Testing Operation of Relays .............................................. 132
RTEST .......................................................................... 132
Sensor Functions ................................................................. 133
Chemical Purge (Optional) ................................................ 133
Automatic Chemical Purge (Interval Purge) ................. 134
Manual Chemical Purge ............................................... 134
Chemical Purge in Power Up ....................................... 134
Starting and Configuring Chemical Purge ......................... 135
Using Buttons on Motherboard..................................... 135
Using Display/Keypad (Optional) ................................. 135
Using Serial Line .......................................................... 136
PURGE .................................................................... 136
PUR ......................................................................... 136
RGLIMIT .................................................................. 137
Sensor Heating .................................................................. 138
Setting Humidity Sensor Heating ................................. 138
XHEAT .................................................................... 138
CHAPTER 5
MODBUS .................................................................................................... 141
Overview of Modbus Protocol Support .............................. 141
Taking Modbus into Use .................................................... 142
Enabling Serial Modbus ....................................................... 143
Using Display/Keypad (Optional) ...................................... 143
Using Serial Line ............................................................... 143
Enabling Ethernet Modbus .................................................. 144
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Using Display/Keypad (Optional) ...................................... 144
Using Serial Line ............................................................... 146
Diagnostic Modbus Counters ............................................. 147
Viewing Counters Using Display/Keypad .......................... 147
Viewing Counters Using Service Port ............................... 148
Disabling Modbus ................................................................ 148
CHAPTER 6
MAINTENANCE ......................................................................................... 149
Periodic Maintenance .......................................................... 149
Cleaning ............................................................................ 149
Changing the Probe Filter ................................................. 149
Changing the Sensor ........................................................... 150
Error States ....................................................................... 151
Technical Support ................................................................ 153
Product Returns ................................................................... 153
CHAPTER 7
CALIBRATI O N AND AD JUSTMENT ......................................................... 155
Opening and Closing the Adjustment Mode ..................... 155
Relative Humidity Adjustment ............................................ 157
Using Push Buttons ........................................................... 157
Using Display/Keypad ....................................................... 158
Using Serial Line ............................................................... 159
Multipoint Adjustment Using Serial Line ........................... 161
MPC Command Syntax ............................................... 161
Example Multipoint Adjustment Procedure .................. 162
Relative Humidity Adjustment after Sensor Change ........ 164
Using Display/Keypad ....................................................... 164
Using Serial Line ............................................................... 164
FCRH ........................................................................... 164
Temperature Adjustment ..................................................... 165
Using Display/Keypad ....................................................... 165
Using Serial Line ............................................................... 165
Analog Output Adjustment.................................................. 167
Using Display/Keypad ....................................................... 167
Using Serial Line ............................................................... 167
ACAL ............................................................................ 167
Feeding Adjustment Information ........................................ 168
Using Display/Keypad ....................................................... 168
Using Serial Line ............................................................... 168
CTEXT ......................................................................... 168
CDATE ......................................................................... 168
CHAPTER 8
TECHNICAL DATA .................................................................................... 169
Specifications ....................................................................... 169
Performance ...................................................................... 169
Relative Humidity ......................................................... 169
Temperature (+ Operating Pressure Ranges) ............. 170
Optional Temperature Probe ....................................... 170
Calculated Variables .................................................... 171
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User's Guide _______________________________________________________________________
Accuracies of Calculated Variables ................................... 171
Accuracy of Dewpoint Temperature °C ........................ 171
Accuracy of Mixing Ratio g/kg (Ambient Pressure 1013
mbar) ............................................................................ 171
Accuracy of Wet Bulb Temperature °C ........................ 172
Accuracy of Absolute Humidity g/m³ ............................ 172
Dewpoint Temperature (HMT337 Warmed Probe Option) 173
Operating Environm ent...................................................... 173
Inputs and Outputs ............................................................ 174
Mechanics ......................................................................... 175
Technical Specifications of Optional Modules ................... 176
Power Supply Module .................................................. 176
Analog Output Module .................................................. 176
Relay Module ............................................................... 176
RS-485 Module ............................................................ 177
LAN Interface Module ................................................... 177
WLAN Interface Module ............................................... 177
Data Logger Module ..................................................... 177
Spare Parts and Accessories .............................................. 178
Dimensions (mm/inch) ......................................................... 180
HMT331 ............................................................................. 182
HMT333 ............................................................................. 183
HMT334 ............................................................................. 183
HMT335 ............................................................................. 183
HMT337 ............................................................................. 184
HMT338 ............................................................................. 184
Temperature Probe ........................................................... 184
APPENDIX A
PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES ......... 185
Duct Installation Kits (for HMT333/337/335) ....................... 185
Duct Installation Kit for Temper ature Probe (for HMT337)
................................................................................................ 186
Pressure Tight Swagelok Install ation Kits (for HMT337) .. 187
RH Probe Installation ......................................................... 187
Temperature Probe Installation ......................................... 187
Examples of Vapor Tight Installations with Cable Gland . 188
RH-Probe Installations (for HMT333/337) ......................... 188
T- Probe Installations (HMT337) ....................................... 189
Example of Climate Chamber Installation ......................... 190
Example of Installation Through Roof ............................... 191
Ball Valve Installation Kit for HMT338 ................................ 192
Meteorological Installa tion Kit (for HMT337) ..................... 194
APPENDIX B
CALCULATION FORMULAS ..................................................................... 195
APPENDIX C
MODBUS REFERENCE ............................................................................. 199
Function Codes..................................................................... 199
Register Map ......................................................................... 200
Data Encoding ................................................................... 200
32-Bit Floating Point Format ......................................... 200
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16-Bit Integer Format ................................................... 201
Measurement Data (Read-Only) ....................................... 202
Status Registers (Read-Only) ........................................... 202
Configuration Registers ..................................................... 203
Exception Status Outputs ................................................... 204
Diagnostic Sub-Functions ................................................... 204
Device Identification Objects .............................................. 205
Exception Responses .......................................................... 206
VAISALA _________________________________________________________________________ 7
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List of Figures
Figure 1 Transmitter Body ...................................................................... 21
Figure 2 Inside the Transmitter ............................................................... 22
Figure 3 HMT331 Fixed Probe ............................................................... 23
Figure 4 HMT331 Short Cable Probe ..................................................... 23
Figure 5 Probe Options ........................................................................... 24
Figure 6 Standard Mounting ................................................................... 27
Figure 7 Mounting with Wall Mounting Kit .............................................. 28
Figure 8 Dimensions of the Plastic Mounting Plate (mm/inch) ............... 28
Figure 9 Dimensions of the Probe Holder Plate (mm/inch) .................... 29
Figure 10 Mounting with the DIN Rail Installat ion Kit ............................... 30
Figure 11 Vertical Pole .............................................................................. 30
Figure 12 Horizontal Pole ......................................................................... 31
Figure 13 Mounting with Metal Wall Mounting Plate ................................ 31
Figure 14 Dimensions of the Metal Mounting Plate (mm/inch) ................. 32
Figure 15 Mounting the Rain Shield with the Installation Kit .................... 32
Figure 16 Panel Mounting Frame ............................................................. 33
Figure 17 Panel Mounting Dimensions (mm/inch) .................................... 34
Figure 18 Cable Bushings......................................................................... 34
Figure 19 Grounding the Screen of Electrical Cable ................................ 35
Figure 20 Screw Terminal Block on Motherboard .................................... 37
Figure 21 Connections to 24 VAC Power Supply ..................................... 39
Figure 22 Measurement Error at 100 %RH .............................................. 40
Figure 23 Horizontal Mounting of Probe ................................................... 41
Figure 24 Vertical Mounting of Probe ....................................................... 42
Figure 25 HMT344 Probe ......................................................................... 44
Figure 26 Tightening the Nut .................................................................... 44
Figure 27 Cleaning of Tightening Cone .................................................... 45
Figure 28 HMT338 Probe ......................................................................... 47
Figure 29 Sealing of Fitting Body into Process ......................................... 47
Figure 30 Tightening the Clasp Nut .......................................................... 48
Figure 31 Power Su pp l y Module ............................................................... 49
Figure 32 Galvanic Isolation Module ........................................................ 54
Figure 33 Third Analog Output ................................................................. 54
Figure 34 Third Analog Output Selection .................................................. 55
Figure 35 Relay Module ............................................................................ 57
Figure 36 RS-422/485 Module .................................................................. 58
Figure 37 4-Wire RS-485 Bus ................................................................... 60
Figure 38 2-Wire RS-485 Bus ................................................................... 61
Figure 39 LAN Interface Module ............................................................... 62
Figure 40 WLAN Interface Module ........................................................... 63
Figure 41 Data Logger Module ................................................................. 65
Figure 42 Pinout of the Optional 8-Pin Connector .................................... 66
Figure 43 Basic Display ............................................................................ 67
Figure 44 Graphical Display...................................................................... 68
Figure 45 Graphical Display with Data Logger ......................................... 69
Figure 46 Main Menus .............................................................................. 70
Figure 47 Alarm Limits Shown on Graph Screen ..................................... 75
Figure 48 Display Alarm Active ................................................................. 75
Figure 49 Disp lay A l arms .......................................................................... 76
Figure 50 Modifying an Alarm Limit .......................................................... 76
Figure 51 Service Port Connector and User Port Terminal on
Motherboard ............................................................................. 79
Figure 52 Connection Example between PC Serial Port and User Port .. 80
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Figure 53
Figure 54 IP Configuration Menu .............................................................. 84
Figure 55 Wireless LAN Settings .............................................................. 87
Figure 56 Entering Network SSID ............................................................ 87
Figure 57 Selecting the Wireless Network Type ...................................... 87
Figure 58 Web Configuration Interface for LAN ....................................... 90
Figure 59 Opening a Serial Connection ................................................... 91
Figure 60 Opening a Telnet Connection .................................................. 92
Figure 61 Device Information on Display ............................................... 108
Figure 62 Current/Voltage Switches of Output Modules ........................ 120
Figure 63 Measurement-Based Relay Output Modes ............................ 126
Figure 64 FAULT/ONLINE STATUS Relay Output Modes .................... 128
Figure 65 Relay Indicators on Display .................................................... 130
Figure 66 Decrease of Sensor Gain ....................................................... 133
Figure 67 Purge Buttons on Motherboar d .............................................. 135
Figure 68 Chemical Purge Settings ........................................................ 135
Figure 69 Performing Chemical Purge ................................................... 136
Figure 70 Serial Interface Settings ......................................................... 143
Figure 71 IP Configuration ...................................................................... 145
Figure 72 Wireless LAN Settings ............................................................ 145
Figure 73 Communication Protoco l ........................................................ 145
Figure 74 Modbus Counters ................................................................... 147
Figure 75 Changing the Sensor .............................................................. 150
Figure 76 Error Indicator and Error Message ......................................... 151
Figure 77 Adjustment and Purge Buttons .............................................. 156
Figure 78 Adjustment Menu ................................................................... 156
Figure 79 Selecting Point 1 Reference Type .......................................... 158
Figure 80 Accuracy over Temperature Range ....................................... 170
Figure 81 Accuracy in Dewpoint Measurement ...................................... 173
Figure 82 Transmitter Body Dimensions ................................................ 180
Figure 83 WLAN Antenna Dimensions ................................................... 181
Figure 84 HMT331 Fixed Probe Dimensions ......................................... 182
Figure 85 HMT331 Short Cable Probe Dimensions ............................... 182
Figure 86 HMT333 Probe Dimensions ................................................... 183
Figure 87 HMT334 Probe Dimensions ................................................... 183
Figure 88 HMT335 Probe Dimensions ................................................... 183
Figure 89 HMT337 Probe Dimensions ................................................... 184
Figure 90 HMT338 Probe Dimensions ................................................... 184
Figure 91 Optional Temperature Probe Dimensions .............................. 184
Figure 92 Duct Mounting Installation Kit ................................................. 185
Figure 93 Duct Mounting Installation Kit for T-Probe ............................. 186
Figure 94 Swagelok Installation Kit for RH-probe .................................. 187
Figure 95 Swagelok Installation Kit for T-Probe ..................................... 187
Figure 96 Cable Installation with Cable Gland ....................................... 188
Figure 97 Probe Installation with Cable Gland ....................................... 188
Figure 98 Vapor Tight Installation ........................................................... 189
Figure 99 Wall Mounting Installation ...................................................... 189
Figure 100 Climate Chamber Installation (not Available from Vaisala) .... 190
Figure 101 Example of Installation through Roof ..................................... 191
Figure 102 Installing the HMT338 Probe Through a Ball Valve
Figure 103 Meteorological Installation Kit for Outdoor Installation ........... 194
Network Interface Menu ........................................................... 84
Assembly ................................................................................ 192
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User's Guide _______________________________________________________________________
List of Tables
Table 1 Manual Revisions ..................................................................... 12
Table 2 Application, Location Classes ................................................... 15
Table 3 Quantities Measured by HMT330 ............................................. 19
Table 4 Optional Quantities Measured by HMT330 .............................. 19
Table 5 HMT338 Probe Dimensions ..................................................... 47
Table 6 Connecting the Twisted Pair Wires to the Screw Terminals .... 59
Table 7 4-Wire (Switch 3: On) ............................................................... 60
Table 8 2-Wire (Switch 3: Off) ............................................................... 61
Table 9 Observation Periods and Res olut io n ........................................ 64
Table 10 Wiring of the Optional 8-Pin Connector .................................... 66
Table 11 Periods for Trend and Max/Min Calculations ........................... 68
Table 12 Graph Information Messages in Cursor Mode ......................... 69
Table 13 ALSEL Parameters ................................................................... 77
Table 14 Default Serial Communication Settings for the User Port ........ 80
Table 15 Communication Settings for the Service Port ........................... 82
Table 16 IP Settings for the LAN and WLAN Interfaces .......................... 83
Table 17 Wireless LAN Settings .............................................................. 86
Table 18 Measurement Commands ........................................................ 93
Table 19 Communication Commands ..................................................... 93
Table 20 Formatting Commands ............................................................. 93
Table 21 Data Recording Commands ..................................................... 94
Table 22 Chemical Purge Commands ..................................................... 94
Table 23 Calibration and Adjustment Commands ................................... 94
Table 24 Setting and Testing the Analog Outputs ................................... 94
Table 25 Setting and Testing the Relays ................................................. 94
Table 26 Other Commands ..................................................................... 95
Table 27 FORM Command Modifiers .................................................... 102
Table 28 Conversion Factors for Pressure Units .................................. 105
Table 29 Filtering Levels ........................................................................ 107
Table 30 Selection of Output Modes ..................................................... 114
Table 31 Relay State Examples ............................................................ 129
Table 32 Supported Modbus Variants ................................................... 141
Table 33 Error Messages ...................................................................... 152
Table 34 Indicator Led Functions .......................................................... 156
Table 35 Example List for Multipoint Correction .................................... 162
Table 36 Calculated Variables (Typical Ranges) .................................. 171
Table 37 Standard Probe Cable Lengths and Approximate
Transmitter Weight (in kg/lb) .................................................. 175
Table 38 Spare Parts and Accessories ................................................. 178
Table 39 Supported Function Codes ..................................................... 199
Table 40 HMT330 Modbus Register Blocks .......................................... 200
Table 41 Measurement Data Registers ................................................. 202
Table 42 Status Registers ..................................................................... 202
Table 43 Configuration Parameter Registers ........................................ 203
Table 44 Configuration Flag Registers .................................................. 203
Table 45 HMT330 Exception Status Outputs ........................................ 204
Table 46 HMT330 Modbus Diagnostics ................................................ 204
Table 47 HMT330 Modbus Device Identification ................................... 205
Table 48 HMT330 Modbus Exception Responses ................................ 206
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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 HUMICAP® Humidity and Temperature
Transmitter Series HMT330.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, Gen er al In for m ati on , provides general notes for the manual
and the product.
- Chapter 2, Product Overview, introduces the features, advantages, and
the product nomenclature of HMT330.
- Chapter 3, Installation, provides you with information that is intended
to help you install the 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, contains information that is needed in basic
maintenance of the product.
- Chapter 7, Calibration and Adjustment, provides information and
instructions concerning calibration and adjustment of HMT330.
- Chapter 8, Technical Data, provides the technical data of the product.
- Appendix A, Probe Installation Kits and Installation Examples,
presents the installation kits available for HMT330 and provides some
installation examples.
- Appendix B, Calculation Formulas, presents the equations used in
HMT330 to calculate values of dewpoint, mixing ratio, absolute
humidity and enthalpy in normal pressure.
- Appendix C, Modbus Reference, describes the Modbus functions and
data of the transmitter.
VAISALA ________________________________________________________________________ 11
User's Guide _______________________________________________________________________
Manual Code
Description
M210566EN-K
December 2013. This manual. Applicable from
description. Various small corrections.
M210566EN-J
Previous version. Updated Chapter 2 Product
Overview. Updated Appendix C Modbus Reference.
M210566EN-I
Applicable from transmitter software version 5.10
temperature range.
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 warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged or
important data could be lost.
Note highlights important information on using the product.
Version Information
Table 1 Manual Revisions
transmitter software version 5.14 onward. Added
description of VHP filter option. Added new
command descriptions: ALSEL, AOVER, CON,
DSEND, MODS, RGLIMIT, RHLIMIT, and MPC
(multipoint RH calibration). Updated FILT command
onward. Added Modbus protocol. Updated serial line
command descriptions. Updated storage
Documentation Conventions
WARNING
CAUTION
NOTE
Throughout the manual, important safety considerations are highlighted
as follows:
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Chapter 1 _________________________________________________________ General Information
Ground the product, and verify outdoor installation
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.
Safety
The Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT330 delivered to you has been tested for safety and approved as
shipped from the factory. Note the following precautions:
WARNING
CAUTION
grounding
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 ________________________________________________________________________ 13
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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 Conformity
Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT330 is in conformity with the provisions of the following EU
directives:
- Low Voltage Directive
- EMC-Directive
- ROHS Directive
Conformity is shown by compliance with the following standards:
- EN 60950-1: Information technology equipment – Safety – Part 1:
General requirements.
- 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.
- EN 61000-3-2: Limits for harmonic current emissions.
- EN 61000-3-3: Limitation of voltage changes, voltage fluctuations
and flicker in public low-voltage supply systems.
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Chapter 1 _________________________________________________________ General Information
Type
HMT330
Temperature
B
Humidity
B
Vibration
A
EMC
B
Enclosure
B/IP65
DNV Type Approval
The Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT330 is found to comply with Det Norske Veritas' Rules for
Classification of Ships, High Speed & Light Craft and Det Norske
Veritas' Offshore standards.
Applicable tests carried out according to Standard for Certification
No. 2.4, April 2006.
Table 2 Application, Location Classes
TYPE APPROVED PRODUCT
CERTIFICATE NO.: A-13529
VAISALA ________________________________________________________________________ 15
User's Guide _______________________________________________________________________
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
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 equipment 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.
16 ___________________________________________________________________ M210566EN-K
Chapter 1 _________________________________________________________ General Information
Patent Notic e
The Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT330 is 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
HUMICAP® is a registered trademark of Vaisala Oyj.
All other trademarks are the property of their respective owners.
Software License
Warranty
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.
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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User's Guide _______________________________________________________________________
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Chapter 2 ___________________________________________________________ Product Overview
Quantity
Abbreviation
Metric Unit
Non-Metric Unit
Relative humidity (RH)
RH
%RH
%RH
Temperature (T)
T
ºC
ºF
Quantity
Abbreviation
Metric Unit
Non-Metric Unit
Dewpoint / Frostpoint
Temperature (T
d/f
)
TDF
ºC
ºF
Dewpoint Temperature (Td)
TD
ºC
ºF
Absolute humidity (a)
A
g/m3
gr/ft3
Mixing ratio (x)
X
g/kg
gr/lb
Wetbulb temperature (Tw)
TW
ºC
ºF
Humid air volume / dry air
weight) (H2O)
H2O
ppmv/ppmw
ppmv/ppmw
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
CHAPTER 2
PRODUCT OVERVIE W
This chapter introduces the features, advantages, and the product
nomenclature of the Vaisala HUMICAP® Humidity and Temperature
Transmitter Series HMT330.
Introduction to HMT330
The HMT330 transmitter provides reliable humidity measurement in a
wide range of applications. Analog outputs can be chosen between
current and voltage signals. Alternatively, digital outputs RS-232
(standard) or RS-422/485 (optional) can be selected.
The quantities measured and calculated by HMT330 are presented in
Table 3 below. The quantities available as an option are presented in
Table 4 below.
Table 3 Quantities Measured by HMT330
Table 4 Optional Quantities Measured by HMT330
volume (by volume or by
VAISALA ________________________________________________________________________ 19
User's Guide _______________________________________________________________________
Basic Features an d Options
- Several probes for various applications
- User-friendly display and keypad interface (optional)
- Calculated output quantities available
- Different probe mounting kits, sensor protection options and probe
cable lengths
- Transmitter mounting kits for multiple installation purposes
- Chemical purge for applications where interfering chemicals in the
measuring environment pose a risk
- Warmed probe and sensor heating for high humidity conditions
(HMT337)
- Additional temperature sensor (HMT337)
- Support for Modbus serial communications protocol
- USB connectivity for service connections via the optional
USB-RJ45 cable
- Optional modules:
- Isolated power supply
- 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
- Relay module
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Chapter 2 ___________________________________________________________ Product Overview
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
VAISALA ________________________________________________________________________ 21
User's Guide _______________________________________________________________________
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 = Humidity probe cable
9 = Temperature probe cable (optional)
10 = Galvanic isolation module (optional)
11 = Adjustment buttons (chemical purge buttons) with indicator
LED
0508-010
Figure 2 Inside the Transmitter
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Chapter 2 ___________________________________________________________ Product Overview
Probe Options
The HMT331 is intended for demanding wall-mounted applications. The
standard version has a fixed probe.
1102-025
Figure 3 HMT331 Fixed Pro be
The HMT331 short cable probe is a special version for use with the
WLAN module and when LAN module and power supply module are
simultaneously installed. It has the HMT333 probe on a short cable
(21 cm), and a mounting plate with a probe holder.
1102-024
Figure 4 HMT331 Short Cable Probe
VAISALA ________________________________________________________________________ 23
User's Guide _______________________________________________________________________
The following numbers refer to Figure 5:
1 = HMT333 for ducts and tight spaces
2 = HMT334 for high pressure and vacuum applications
(up to 100 bars)
3 = HMT335 for high temperatures (up to 180 ºC, vapor tight)
*) Flange available as an opti on
4 = HMT337 for high humidity applications
(optional warmed probe)
5 = HMT338 for pressurized pipelines (up to 40 bar)
Figure 5 Probe Options
For probe cable lengths, see Table 37 on page 175.
0911-066
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Chapter 2 ___________________________________________________________ Product Overview
Warmed Probe HMT337
Temperature difference between the probe and external environment can
cause a risk of condensation on the sensor. A wet probe cannot observe
the actual humidity in the ambient air. If the condensed water is
contaminated, the life span of the probe may shorten and calibration may
change.
HMT337 probe shall be used in applications where condensation can
occur due to high humidity and rapid humidity changes. The warmed
probe is heated continuously so that its temperature is always higher than
in environment. This prevents condensation on the probe. The power
consumption of the warmed probe is slightly higher than other probes.
Filter Options
There are several filter types for HMT330. All filters are 12 mm in
diameter with a female thread, and are compatible with all HMT330
probe models. The filters recommended for a probe type can be selected
on the corresponding HMT330 order form.
Fore more information, see section Spare Parts and Accessories on page
178
Catalytic VHP Filter
Vaporized hydrogen peroxide (VHP) is a gaseous form of hydrogen
peroxide that is commonly used in decontamination and sterilization.
Hydrogen peroxide has relatively low saturation pressure which increases
the possibility of saturation when used in humid conditions. When
saturation conditions occur, liquid hydrogen peroxide will form on
surfaces in the decontaminated space.
Vaisala HUMICAP® sensor is compatible with direct VHP exposure
even at high concentrations and hundreds of VHP cycles up to saturation.
The long term performance is very good at concentrations higher than
typically used for sterilization. However, for the applications where full
saturation is possible, Vaisala recommends using the catalytic VHP filter
to protect the sensor and extend the calibration interval.
The catalytic filter is based on a generally known method where the H2O2
is split to H2O and O2. This reaction is produced by the catalyst layer that
has been applied to the filter. As the filter prevents the VHP from
reaching the humidity sensor, the sensor responds to humidity only. The
catalytic filter affects the reading approximately +1 %RH at 300 pmm
VHP, or +3 %RH at 900 ppm VHP (at 23 °C / 73.4 °F).
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Chapter 3 ________________________________________________________________ Installation
CHAPTER 3
INSTALLATION
This chapter provides you with information that is intended to help you
install the product.
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 by attaching the transmitter to a wall with 4 screws,
for example, M6 (not provided).
0804-066
Figure 6 Standard Mounting
VAISALA ________________________________________________________________________ 27
User's Guide _______________________________________________________________________
The following numbers refer to Figure 7 above:
1 = Plastic mounting plate
2 = Mount the plate to wall with 4 screws M6 (not provided)
3 = Arched side up
4 = Attach the HMT330 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.
0503-004
Figure 7 Mounting with Wall Mounting Kit
Figure 8 Dimensions of the Plastic Mounting Plate (mm/inch)
28 ___________________________________________________________________ M210566EN-K
0804-065
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