Vaisala HUMICAP HMT100 User manual

USER'S GUIDE
Vaisala HUMICAP
®
Humidity and
Temperature Transmitter Series
HMT100
M210701EN-D

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 2009
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.

________________________________________________________________________________
VAISALA________________________________________________________________________ 3
Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................6
About This Manual...................................................................6
Version Information...............................................................6
Related Manuals...................................................................6
General Safety Considerations.............................................7
Feedback...............................................................................7
Product Related Safety Precautions......................................7
ESD Protection .........................................................................7
Recycling ..................................................................................8
Patent Notice ............................................................................8
Trademarks...............................................................................9
License Agreement..................................................................9
Warranty....................................................................................9
CHAPTER 2
PRODUCT OVERVIEW................................................................................11
Introduction to the HMT100 Humidity and Temperature
Transmitter..............................................................................11
Fixed and Remote Probe Models .......................................12
Optional Display..................................................................12
HMT100 Transmitter Components......................................12
CHAPTER 3
INSTALLATION............................................................................................15
Mounting .................................................................................15
Wall Mounting .....................................................................15
With Plastic Wall Assembly Plate (Provided).................15
With Optional Aluminum Wall Installation Plate.............16
Installation with Rain Shield................................................17
Installation with Radiation Shield ........................................18
Duct Installation Kit .............................................................19
Probe Assembly with Duct Installation Kit .....................20
Drilling Instructions for Duct Installation Kit ...................21
Connections............................................................................22
CHAPTER 4
MAINTENANCE ...........................................................................................25
Replacing the HUMICAP®Sensor.........................................25
Fixed Probe Model..............................................................25
Remote Probe Model..........................................................25
Removing and Fastening the Probe.....................................26
Fixed Probe Model..............................................................26
Remote Probe Model..........................................................27

User's Guide ______________________________________________________________________
4 ___________________________________________________________________ M210701EN-D
Calibration and Adjustment...................................................28
Relative Humidity Adjustment Using Push Buttons.............28
Adjustment with HM70 ........................................................29
Field Checking and Adjustment Using a Calibrated
Reference Probe............................................................30
One-Point Adjustment Using a Calibrator......................31
Two-Point Adjustment Using a Calibrator......................32
LiCl-NaCl Adjustment.....................................................32
Temperature Field Check and Adjustment by Using a
Calibrated Reference Probe...........................................33
Adjustment with HMI41 .......................................................34
Connections and Selecting the Calibrator Function.......35
Offset and Gain Adjustments .........................................36
HMI41 as a Reference Meter....................................36
HMI41 as a Terminal.................................................37
Troubleshooting..............................................................39
Analog Output Tests ..............................................................40
CHAPTER 5
TROUBLESHOOTING..................................................................................41
Error Mode...............................................................................41
Current Output.....................................................................41
Voltage Output.....................................................................41
Technical Support ..................................................................41
Return Instructions ................................................................42
Vaisala Service Centers.........................................................43
CHAPTER 6
TECHNICAL DATA ......................................................................................45
Specifications .........................................................................45
Dimensions in mm (inches)...................................................49

________________________________________________________________________________
VAISALA________________________________________________________________________ 5
List of Figures
Figure 1 HMT100 Components..............................................................13
Figure 2 Plastic Wall Assembly Plate (Spare Part No. GM45160).........15
Figure 3 Plastic Wall Assembly Plate with Aluminum Installation Plate.16
Figure 4 Installation with Rain Shield (Spare Part No. 215109).............17
Figure 5 Installation of the Humidity Probe with the Radiation Shield....18
Figure 6 Probe Installation with the Duct Installation Kit........................19
Figure 7 Assembly of the Humidity Probe with the Duct Installation Kit.20
Figure 8 Drilling Instructions...................................................................21
Figure 9 HMT100 Connection Board......................................................22
Figure 10 (1) Isolated Current-Loop Wiring, (2) Voltage Output Wiring...23
Figure 11 Removing the Humidity Probe (Fixed Probe Model)................26
Figure 12 Removing the Humidity Probe (Remote Probe Model)............27
Figure 13 Adjustment Buttons..................................................................28
Figure 14 Location of the MI70 Probe and Cable Connector Ports .........29
Figure 15 Example of the MI70 Adjustment Menu...................................31
Figure 16 Example of the MI70 Adjustment Mode Graph Display...........31
Figure 17 Location of the HMI41 Calibration Connector..........................34
Figure 18 Accuracy of Temperature Measurement..................................46
Figure 19 Dimensions HMT100 Fixed Probe Model ................................49
Figure 20 Dimensions HMT100 Remote Probe Model.............................50
List of Tables
Table 1 Manual Revisions.......................................................................6
Table 2 Related Manuals ........................................................................6
Table 3 Wiring Table.............................................................................23
Table 4 Common Problems During Adjustment and Their Remedies..39
Table 5 Relative Humidity Measurement Specifications.......................45
Table 6 Temperature Measurement Specifications ..............................45
Table 7 Dewpoint Temperature (Calculated) Measurement
Specifications...........................................................................46
Table 8 Accuracy of Dewpoint Temperature Measurement..................46
Table 9 Operating Environment Specifications.....................................46
Table 10 Inputs and Outputs...................................................................47
Table 11 Mechanics Specifications.........................................................47
Table 12 Options and Accessories..........................................................48

User's Guide ______________________________________________________________________
6 ___________________________________________________________________ M210701EN-D
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 the Humidity and Temperature Transmitter HMT100.
Version Information
Table 1 Manual Revisions
Manual Code Description
M210701EN-A June 2005 - First version
M210701EN-B April 2006 - Corrected Wiring table (Table 3)
M210701EN-C May 2007 - Updated Product Overview,
Figure 9, and duct installation kit order code.
Corrected calibration instructions in the
Maintenance chapter.
M210701EN-D June 2009 - Added spare part numbers of
installation accessories to installation instructions.
Updated calibration and adjustment instructions.
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M210185EN-B Humidity Calibrator HMK15 User's Guide
M210297EN-C Hand-held Humidity and Temperature Meter
HM70 User's Guide
M210316EN-A HMI41 Indicator and HMP41/45/46 Probes
Operating Manual

Chapter 1 ________________________________________________________ General Information
VAISALA________________________________________________________________________ 7
General Safety Considerations
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.
Feedback
Vaisala Customer Documentation Team welcomes your comments and
suggestions on the quality and usefulness of this publication. If you find
errors or have other suggestions for improvement, please indicate the
chapter, section, and page number. You can send comments to us by e-
mail: [email protected]
Product Related Safety Precautions
The Humidity and Temperature Transmitter HMT100 delivered to you
has been tested for safety and approved as shipped from the factory. Note
the following precautions:
CAUTION Do not modify the unit. Improper modification can damage the product
or lead to malfunction.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage to
electronic circuits. Vaisala products are adequately protected against

User's Guide ______________________________________________________________________
8 ___________________________________________________________________ M210701EN-D
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.
Recycling
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations. Do
not dispose of with regular household refuse.
Patent Notice
The HMT100 is protected by the following patents and their
corresponding national rights:
Finnish patent 98861, French patent 6650303, German patent 69418174,
Japanese patent 3585973, UK patent 0665303, U.S. patent 5607564.

Chapter 1 ________________________________________________________ General Information
VAISALA________________________________________________________________________ 9
Trademarks
HUMICAPis a registered trademark of Vaisala Oyj.
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
For certain products Vaisala normally gives a limited one-year 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

User's Guide ______________________________________________________________________
10 __________________________________________________________________ M210701EN-D
This page intentionally left blank.

Chapter 2 __________________________________________________________ Product Overview
VAISALA_______________________________________________________________________ 11
CHAPTER 2
PRODUCT OVERVIEW
Thank you for choosing the Vaisala HUMICAP® Humidity and
Temperature Transmitter Series HMT100. This chapter introduces you to
its features.
The Vaisala range of relative humidity measurement instruments covers
all the applications from ventilation to process control in demanding
explosive areas. For more information about other Vaisala relative
humidity instruments, please contact your Vaisala representative or visit
www.vaisala.com.
Introduction to the HMT100 Humidity and
Temperature Transmitter
The Vaisala HUMICAP®Humidity and Temperature Transmitter Series
HMT100 measures relative humidity, temperature and dewpoint. It is
powered with a 10 ... 35 VDC or 24 VAC input voltage and it outputs an
analog signal of either 4 ... 20 mA, 0 ... 1 V, 0 ... 5 V or 0 ... 10 V.
The HMT100 transmitter can be configured to output either one or two
quantities, in the following combinations:
- simple RH transmitter
- simple Tdtransmitter
- RH and T transmitter
- Tdand T transmitter
The output quantities and the analog signal type (current or voltage
output) are set during order time, and cannot be changed later by the user.
The following accessories are optionally available:
- Wall installation plate (aluminium)
- Duct installation kit
- Rain shield with installation kit
- Rain/solar radiation shield installation kit (for pole installation)

User's Guide ______________________________________________________________________
12 __________________________________________________________________ M210701EN-D
Fixed and Remote Probe Models
The HMT100 is available either with a fixed probe (0.1 m probe cable)
or a remote probe with different cable lengths (3/5/10 m cable lengths. A
10 m extension cable is also available; see Table 12 Options and
Accessories on page 48).
The HMP100 relative humidity probe used in the HMT100 transmitter is
fully interchangeable. You can easily remove the probe and replace it
with a new one without having to adjust the transmitter.
Optional Display
The HMT100 is also available with an optional one-line display. The
display shows the measurement results of selected parameters in selected
units (selected at the time of ordering). The parameters are displayed in
turns one at a time. The display backlight is turned on and off with a
jumper on the transmitter electronics motherboard.
HMT100 Transmitter Components
Figure 1 on page 13 illustrates the main features of HMT100. On the left
is a remote probe model without display, and on the right is a fixed probe
model with the optional display. The numbers and arrows indicate the
main components of the transmitters.

Chapter 2 __________________________________________________________ Product Overview
VAISALA_______________________________________________________________________ 13
0603-048
Figure 1 HMT100 Components
The following numbers refer to Figure 1 above:
1 = Transmitter housing; transmitter cover
2 = Probe cover
3 = Probe cable
4 = HMP100 probe
5 = Filter
See Table 12 on page 48 for spare part numbers.

User's Guide ______________________________________________________________________
14 __________________________________________________________________ M210701EN-D
This page intentionally left blank.

Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 15
CHAPTER 3
INSTALLATION
Mounting
Wall Mounting
With Plastic Wall Assembly Plate (Provided)
1. Attach the wall assembly plate to the wall with two screws.
2. Press the transmitter down so that it slides along the rails of the
mounting plate.
0505-171
Figure 2 Plastic Wall Assembly Plate (Spare Part No.
GM45160)

User's Guide ______________________________________________________________________
16 __________________________________________________________________ M210701EN-D
With Optional Aluminum Wall Installation Plate
1. Attach the aluminum plate to the wall.
2. Attach the plastic wall assembly plate (provided) to the aluminum
plate with two screws.
3. Press the transmitter down so that it slides along the rails of the
wall assembly plate.
0505-339
Figure 3 Plastic Wall Assembly Plate with Aluminum
Installation Plate
The following numbers refer to Figure 3 above:
1 = Plastic wall assembly plate (provided) (spare part no.
GM45160)
2 = Aluminum wall installation plate (optional accessory,
see order form; spare part no. DRW010712)

Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 17
Installation with Rain Shield
The installation kit with rain shield includes a metal mounting plate and
a rain shield for the transmitter. Vaisala order code: 215109.
0505-340
Figure 4 Installation with Rain Shield (Spare Part No. 215109)
1. Fasten the metal mounting plate to the wall or pole with screws
(see Figure 4 above). Note the arrow on the mounting plate. Attach
the mounting plate with the arrow pointing upwards.
2. Fasten the plastic wall assembly plate (provided) to the metal
mounting plate with three screws.
3. Fasten HMT100 Humidity and Temperature Transmitter to the wall
assembly plate by pressing the transmitter down so that it slides
along the rails of the mounting plate.
4. Fasten the rain shield to the metal mounting plate with two (M6)
mounting screws.
NOTE Remove the rain shield before taking out the HMT100.

User's Guide ______________________________________________________________________
18 __________________________________________________________________ M210701EN-D
Installation with Radiation Shield
DTR502 with probe installation kit includes a rain/solar radiation shield
DTR502 and a plastic installation support for the humidity probe. Vaisala
order code: DTR502B. If you already have the DTR502 shield and need
only the installation support for the probe, it is available with Vaisala
order code 210623.
1. Fasten the probe to the installation support with two cable ties
(items 3 and 4 in Figure 5 below).
2. Insert and attach the support to the radiation shield by tightening
the plastic nut (item 2 in Figure 5).
3. Attach the entire radiation shield/probe assembly to a pole mast
(pole mast diameter: 30 ... 60 mm/1.2 ... 2.3") with the U-bolt and
support arm. See Figure 5.
1
2
3
4
5
6
0505-248
Figure 5 Installation of the Humidity Probe with the
Radiation Shield
The following numbers refer to Figure 5 above:
1 = DTR502
2 = Plastics nut
3, 4 = Cable tie
5 = Adapter DRW212054 (installation support)
6 = Probe

Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 19
Duct Installation Kit
The duct installation kit includes a plastic pipe with a flange (Vaisala
order code: 215619). To install the HMP100 probe with the duct
installation kit, drill a hole to the duct wall, assemble the probe to the
duct installation kit, slide the probe head through the hole, and attach the
flange to the duct wall with four screws. See pages 20 and 21 for details.
24
L
1
0505-176
Figure 6 Probe Installation with the Duct Installation Kit
The following explanations refer to Figure 6 above:
1 = Tension screw
Distance L can be adjusted and locked in place with the tension screw.

User's Guide ______________________________________________________________________
20 __________________________________________________________________ M210701EN-D
Probe Assembly with Duct Installation Kit
2
1
3
0505-177
Figure 7 Assembly of the Humidity Probe with the Duct
Installation Kit
The following numbers refer to Figure 7 above:
1 = HMP100
2 = Duct installation kit
3 = Probe cable
1. Slide the probe cable through the duct installation kit plastic pipe.
2. Attach the probe cable to the HMP100 Humidity Probe.
3. Attach probe assembly to the duct.