Vaisala HUMICAP HMT330 SERIES User manual

USER'S GUIDE
Vaisala HUMICAP® Humidity and
Temperature Transmitter Series
HMT330
M210566EN-J

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

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Table of Contents
CHAPTER 1
GENERAL INFORMATION..........................................................................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..........................15
Transmitters with WLAN Interface ......................................16
Patent Notice ..........................................................................16
Trademarks.............................................................................16
License Agreement................................................................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
CHAPTER 3
INSTALLATION............................................................................................27
Mounting the Housing ...........................................................27
Standard Mounting without Mounting Plate........................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 Wiring.........................................37
Connections to a 24 VAC Power Supply ............................38
Probe Mounting......................................................................40
General Instructions for Probes with a Cable .....................41
HMT333 for Ducts and Tight Spaces..................................43

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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 for Output...............................................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............................................................65
8-Pin Connector...................................................................67
CHAPTER 4
OPERATION.................................................................................................69
Getting Started........................................................................69
Display/Keypad (Optional).....................................................69
Basic Display.......................................................................69
Graphic History....................................................................70
Menus and Navigation.........................................................72
Changing the Language.................................................73
Rounding Setting............................................................73
Display Backlight Setting................................................73
Display Contrast Setting.................................................74
Keypad Lock (Key guard)...............................................74
Menu PIN Lock...............................................................74
Factory Settings .............................................................75
Display Alarms.....................................................................75
Configuring a Display Alarm...........................................76
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
Using Serial Line............................................................85
Wireless LAN Configuration................................................86
Using Display/Keypad....................................................87
Using Serial Line............................................................88
Communication Protocol .....................................................89

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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
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
Date and Time...................................................................105
Using Display/Keypad..................................................105
Using Serial Line..........................................................106
Data Filtering.....................................................................106
FILT..............................................................................107
Device Information............................................................107
? ...................................................................................108
LIGHT...........................................................................108
HELP............................................................................109
ERRS...........................................................................109
VERS ...........................................................................109
Resetting Transmitter Using Serial Line ...........................109
RESET.........................................................................109
Locking Menu/Keypad Using Serial Line..........................110
LOCK ...........................................................................110
Serial Output Settings..........................................................110
Using Display/Keypad.......................................................111
Using Serial Line...............................................................112
SERI.............................................................................112
SMODE........................................................................113
ADDR...........................................................................113
INTV.............................................................................114
SDELAY.......................................................................114
ECHO...........................................................................115
Data Recording.....................................................................115
Selecting Data Recording Quantities................................115
DSEL............................................................................115
View Recorded Data.........................................................116
DIR...............................................................................116
PLAY............................................................................117

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Deleting the Recorded Files..............................................118
UNDELETE..................................................................119
Analog Output Settings .......................................................119
Changing Output Mode and Range...................................119
Analog Output Quantities..................................................121
AMODE/ASEL..............................................................122
Analog Output Tests..........................................................123
ITEST ...........................................................................123
Analog Output Fault Indication Setting..............................124
AERR............................................................................124
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 Relays.................................................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
Sensor Heating..................................................................137
Setting Humidity Sensor Heating.................................138
XHEAT ....................................................................138
CHAPTER 5
MODBUS ....................................................................................................139
Overview of MODBUS Protocol Support............................139
Taking MODBUS into Use.................................................140
Enabling Serial MODBUS.....................................................141
Using Display/Keypad (Optional) ......................................141
Using Serial Line ...............................................................141
Enabling Ethernet MODBUS................................................143
Using Display/Keypad (Optional) ......................................143
Using Serial Line ...............................................................144
Diagnostic MODBUS Counters ...........................................146
Viewing Counters Using Display/Keypad..........................146
Viewing Counters Using Service Port ...............................146
Disabling MODBUS ..............................................................147

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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
CALIBRATION AND ADJUSTMENT.........................................................155
Opening and Closing the Adjustment Mode .....................155
Relative Humidity Adjustment ............................................157
Using Push Buttons...........................................................157
Using Display/Keypad.......................................................158
Using Serial Line...............................................................159
CRH .............................................................................159
Relative Humidity Adjustment after Sensor Change........160
Using Display/Keypad.......................................................160
Using Serial Line...............................................................160
FCRH...........................................................................160
Temperature Adjustment.....................................................161
Using Display/Keypad.......................................................161
Using Serial Line...............................................................161
Analog Output Adjustment..................................................163
Using Display/Keypad.......................................................163
Using Serial Line...............................................................163
ACAL............................................................................163
Feeding Adjustment Information........................................164
Using Display/Keypad.......................................................164
Using Serial Line...............................................................164
CTEXT .........................................................................164
CDATE.........................................................................164
CHAPTER 8
TECHNICAL DATA....................................................................................165
Specifications.......................................................................165
Performance......................................................................165
Relative Humidity.........................................................165
Temperature (+ Operating Pressure Ranges).............166
Optional Temperature Probe .......................................166
Calculated Variables....................................................167
Accuracies of Calculated Variables ..................................167
Accuracy of Dewpoint Temperature °C .......................167
Accuracy of Mixing Ratio g/kg (Ambient Pressure
1013 mbar)...................................................................167
Accuracy of Wet Bulb Temperature °C........................168
Accuracy of Absolute Humidity g/m³............................168
Dewpoint Temperature (HMT337 Warmed Probe Option)169
Operating Environment.....................................................169
Inputs and Outputs............................................................170
Mechanics.........................................................................170

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Transmitter Weight.......................................................171
Technical Specifications of Optional Modules...................171
Power Supply Module ..................................................171
Analog Output Module..................................................171
Relay Module ...............................................................172
RS-485 Module ............................................................172
LAN Interface Module...................................................172
WLAN Interface Module...............................................172
Data Logger Module.....................................................173
Options and Accessories ....................................................173
Dimensions (mm/inch).........................................................175
HMT331.............................................................................177
HMT333.............................................................................178
HMT334.............................................................................178
HMT335.............................................................................179
HMT337.............................................................................179
HMT338.............................................................................180
Temperature Probe ...........................................................180
APPENDIX A
PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES .........181
Duct Installation Kits (for HMT333/337/335).......................181
Duct Installation Kit for Temperature Probe
(for HMT337)..........................................................................182
Pressure Tight Swagelok Installation Kits (for HMT337)..183
RH Probe Installation.........................................................183
Temperature Probe Installation.........................................183
Examples of Vapor Tight Installations with Cable Gland.184
RH-Probe Installations (for HMT333/337).........................184
T- Probe Installations (HMT337).......................................185
Example of Climate Chamber Installation.........................186
Example of Installation Through Roof...............................187
Ball Valve Installation Kit for HMT338................................188
Meteorological Installation Kit (for HMT337).....................190
APPENDIX B
CALCULATION FORMULAS.....................................................................191
APPENDIX C
MODBUS REFERENCE.............................................................................195
Function Codes.....................................................................195
Register Map.........................................................................196
Data Encoding...................................................................196
32-Bit Floating Point Format ........................................196
16-Bit Integer Format ...................................................197
Measurement Data (Read-Only).......................................198
Status Registers (Read-Only) ...........................................199
Configuration Registers.....................................................199
Exception Status Outputs....................................................200
Diagnostic Sub-Functions...................................................201
Device Identification Objects ..............................................202
Exception Responses..........................................................202

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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 Installation 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 Supply Module ..............................................................49
Figure 32 Galvanic Output 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...............................................................63
Figure 40 WLAN Interface Module...........................................................64
Figure 41 Data Logger Module.................................................................66
Figure 42 Pinout of the Optional 8-Pin Connector....................................67
Figure 43 Basic Display............................................................................70
Figure 44 Graphical Display.....................................................................70
Figure 45 Graphical Display with Data Logger.........................................71
Figure 46 Main Menus..............................................................................72
Figure 47 Alarm Limits Shown on Graph Screen.....................................76
Figure 48 Display Alarm Active ................................................................76
Figure 49 Display Alarms .........................................................................77
Figure 50 Modifying an Alarm Limit..........................................................77
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 Network Interface Menu ...........................................................84
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...............................................107
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 Motherboard ..............................................135
Figure 68 Chemical Purge Settings........................................................135
Figure 69 Performing Chemical Purge ...................................................136
Figure 70 Serial Interface Settings .........................................................141
Figure 71 IP Configuration......................................................................143
Figure 72 Wireless LAN Settings............................................................143
Figure 73 Communication Protocol ........................................................144
Figure 74 MODBUS Counters................................................................146
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........................................166
Figure 81 Accuracy in Dewpoint Measurement......................................169
Figure 82 Transmitter Body Dimensions ................................................175
Figure 83 WLAN Antenna Dimensions...................................................176
Figure 84 HMT331 Fixed Probe Dimensions..........................................177
Figure 85 HMT331 Short Cable Probe Dimensions...............................177
Figure 86 HMT333 Probe Dimensions ...................................................178
Figure 87 HMT334 Probe Dimensions ...................................................178
Figure 88 HMT335 Probe Dimensions ...................................................179
Figure 89 HMT337 Probe Dimensions ...................................................179
Figure 90 HMT338 Probe Dimensions ...................................................180
Figure 91 Optional Temperature Probe Dimensions..............................180
Figure 92 Duct Mounting Installation Kit.................................................181
Figure 93 Duct Mounting Installation Kit for T-Probe..............................182
Figure 94 Swagelok Installation Kit for RH-probe...................................183
Figure 95 Swagelok Installation Kit for T-Probe.....................................183
Figure 96 Cable Installation with Cable Gland .......................................184
Figure 97 Probe Installation with Cable Gland .......................................184
Figure 98 Vapor Tight Installation...........................................................185
Figure 99 Wall Mounting Installation.......................................................185
Figure 100 Climate Chamber Installation (not Available from Vaisala)....186
Figure 101 Example of Installation through Roof .....................................187
Figure 102 Installing the HMT338 Probe Through a Ball Valve
Assembly................................................................................188
Figure 103 Meteorological Installation Kit for Outdoor Installation...........190

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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 Resolution........................................65
Table 10 Wiring of the Optional 8-Pin Connector....................................67
Table 11 Periods for Trend and Max/Min Calculations...........................71
Table 12 Graph Information Messages in Cursor Mode.........................72
Table 13 Default Serial Communication Settings for the User Port........80
Table 14 Communication Settings for the Service Port ..........................82
Table 15 IP Settings for the LAN and WLAN Interfaces .........................83
Table 16 Wireless LAN Settings..............................................................86
Table 17 Measurement Commands........................................................93
Table 18 Communication Commands.....................................................93
Table 19 Formatting Commands.............................................................93
Table 20 Data Recording Commands.....................................................94
Table 21 Chemical Purge Commands ....................................................94
Table 22 Calibration and Adjustment Commands...................................94
Table 23 Setting and Testing the Analog Outputs ..................................94
Table 24 Setting and Testing the Relays................................................94
Table 25 Other Commands.....................................................................95
Table 26 FORM Command Modifiers....................................................102
Table 27 Conversion Factors for Pressure Units..................................105
Table 28 Filtering Levels.......................................................................106
Table 29 Selection of Output Modes.....................................................113
Table 30 Relay State Examples............................................................129
Table 31 Supported MODBUS Variants................................................139
Table 32 Error Messages......................................................................152
Table 33 Indicator Led Functions..........................................................156
Table 34 Calculated Variables (Typical Ranges)..................................167
Table 35 Transmitter Weight (in kg/lb)..................................................171
Table 36 Supported Function Codes ....................................................195
Table 37 HMT330 MODBUS Register Blocks.......................................196
Table 38 Measurement Data Registers ................................................198
Table 39 Status Registers.....................................................................199
Table 40 Configuration Parameter Registers........................................199
Table 41 Configuration Flag Registers..................................................200
Table 42 HMT330 Exception Status Outputs........................................200
Table 43 HMT330 MODBUS Diagnostics.............................................201
Table 44 HMT330 MODBUS Device Identification ...............................202
Table 45 HMT330 MODBUS Exception Responses.............................202

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Chapter 1 ________________________________________________________ General Information
VAISALA_______________________________________________________________________ 11
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 HUMICAP® Humidity and Temperature
Transmitter Series HMT330.
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, 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.

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- 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.
Version Information
Table 1 Manual Revisions
Manual Code Description
M210566EN-J May 2011. This manual. Updated Chapter 2 Product
Overview. Updated Appendix C MODBUS
Reference.
M210566EN-I Previous version. Applicable from transmitter
software version 5.10 onward.
Added MODBUS protocol. Updated serial line
command descriptions. Updated storage
temperature range.
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
WARNING Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or even
death.
CAUTION Caution warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged or
important data could be lost.
NOTE Note highlights important information on using the product.

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VAISALA_______________________________________________________________________ 13
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 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 batteries and the unit according to statutory regulations. Do
not dispose of with regular household refuse.
Regulatory Compliances
EU Declaration of Conformity
The Vaisala Vaisala HUMICAP® Humidity and Temperature
Transmitter Series HMT330 is in conformity with the provisions of the
following EU directives:
- Low Voltage Directive (2006/95/EC)
- EMC-Directive (2004/108/EC)
- ROHS Directive (2002/95/EEC)
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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VAISALA_______________________________________________________________________ 15
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 HMT330
Temperature B
Humidity B
Vibration A
EMC B
Enclosure B/IP65
TYPE APPROVED PRODUCT
CERTIFICATE NO.: A-11440
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,

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16 __________________________________________________________________ M210566EN-J
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 dB are strictly prohibited for
use with this device. The required 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 (e.i.r.p.) is not more than that permitted for successful
communication.
This Class [B] digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe [B] est conforme à la norme
NMB-003 du Canada.
Patent Notice
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.
Windows® is a registered trademark of Microsoft Corporation in the
United States and/or other countries.

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VAISALA_______________________________________________________________________ 17
License Agreement
All rights to any software are held by Vaisala or third parties. The
customer is allowed to use the software only to the extent that is provided
by the applicable supply contract or Software License Agreement.
Warranty
Visit our Internet pages for more information and our standard warranty
terms and conditions: www.vaisala.com/services/warranty.html.
Please observe that any such warranty may not be valid in case of
damage due to normal wear and tear, exceptional operating conditions,
negligent handling or installation, or unauthorized modifications. Please
see the applicable supply contract or Conditions of Sale for details of the
warranty for each product.

User's Guide ______________________________________________________________________
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