Vaisala HUMICAP HMT130 User manual

M211280EN-D
User Guide
Vaisala HUMICAPâHumidity and Temperature
Transmitter Series
HMT130

PUBLISHED BY
Vaisala Oyj
Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
P.O. Box 26, FI-00421 Helsinki, Finland
[phone]
Visit our Internet pages at www.vaisala.com.
© Vaisala 2021
No part of this document 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 documents 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 document are subject
to change without prior notice.
Local rules and regulations may vary and
they shall take precedence over the
information contained in this document.
Vaisala makes no representations on this
document’s compliance with the local
rules and regulations applicable at any
given time, and hereby disclaims any and
all responsibilities related thereto.
This document 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.
This product contains software developed
by Vaisala or third parties. 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.

Table of contents
1. About this document.....................................................................................7
1.1 Version information.......................................................................................... 7
1.2 Related manuals................................................................................................7
1.3 Documentation conventions........................................................................... 8
1.4 Trademarks........................................................................................................ 8
2. Product overview............................................................................................ 9
2.1 Introduction to HMT130................................................................................... 9
2.2 Accessories........................................................................................................ 9
2.3 Fixed and remote probe models................................................................... 10
2.4 Optional display.............................................................................................. 10
2.5 Interchangeable probe................................................................................... 10
2.6 Constant output probe.................................................................................... 11
2.7 Transmitter parts.............................................................................................. 11
2.8 Safety................................................................................................................ 12
2.8.1 ESD Protection..........................................................................................13
3. Installation........................................................................................................14
3.1 Opening the transmitter cover...................................................................... 14
3.2 Wall mounting................................................................................................. 14
3.3 Installation with rain shield.............................................................................16
3.4 Installation with radiation shield....................................................................17
3.5 Duct installation kit......................................................................................... 18
3.5.1 Probe assembly with duct installation kit............................................. 19
3.5.2 Drilling instructions for duct installation kit........................................ 20
3.6 Probe mounting clamp..................................................................................20
3.7 Probe mounting flange................................................................................... 21
3.8 Connections.....................................................................................................22
3.8.1 Wiring....................................................................................................... 23
3.8.2 RS-485 bus termination......................................................................... 24
4. Serial line operation.....................................................................................25
4.1 Using the service port....................................................................................25
4.2 Serial interface settings................................................................................. 25
4.3 Installing driver for the USB service cable...................................................25
4.4 Connecting with a computer........................................................................ 26
4.5 List of serial commands.................................................................................28
4.6 Device information and status......................................................................30
4.7 Serial line output and communication.........................................................34
4.8 Calibration commands...................................................................................35
4.9 Configuring serial line operation.................................................................. 39
4.10 Measurement parameter configuration commands..................................40
4.11 Analog output configuration commands..................................................... 41
4.12 Relay output configuration...........................................................................44
4.13 Other commands............................................................................................46
4.14 User port (RS-485) commands..................................................................... 51
Table of contents
1

5. Maintenance....................................................................................................55
5.1 Removing and fastening fixed probe...........................................................55
5.2 Removing and fastening remote probe.......................................................56
5.3 Testing analog outputs.................................................................................. 56
5.4 Replacing the HUMICAPâsensor.................................................................57
6. Calibration and adjustment......................................................................58
6.1 Calibration and adjustment overview ......................................................... 58
6.2 Push-button calibration.................................................................................59
6.2.1 Adjusting humidity and temperature with push buttons...................59
6.3 Adjusting RH and T with MI70 handheld indicator.................................... 62
6.3.1 Field checking and adjustment using a calibrated
reference probe....................................................................................... 63
6.3.2 1-point adjustment using a calibrator...................................................64
6.3.3 2-point adjustment using a calibrator..................................................64
6.3.4 LiCl-NaCl adjustment..............................................................................65
6.3.5 Temperature field check and adjustment using a
calibrated reference probe.................................................................... 66
7. Troubleshooting............................................................................................ 67
7.1 Error codes...................................................................................................... 67
7.2 Solving typical problems...............................................................................68
7.3 Analog output error notification.................................................................. 69
8. Technical data................................................................................................ 70
8.1 Specifications..................................................................................................70
8.2 Spare parts and accessories..........................................................................73
8.3 Transmitter dimensions..................................................................................74
Appendix A: Calculation formulas..............................................................76
A.1 Calculation formulas overview......................................................................76
A.2 Dew point temperature..................................................................................76
A.3 Dew/frost point temperature calculation.................................................... 77
A.4 Mixing ratio calculation..................................................................................77
A.5 Saturation vapor pressure calculation......................................................... 77
A.6 Water vapor pressure calculation.................................................................78
A.7 Absolute humidity calculation...................................................................... 78
A.8 Enthalpy calculation.......................................................................................79
A.9 Accuracies of calculated variables............................................................... 79
A.9.1 Accuracy of dew point temperature °C................................................79
A.9.2 Accuracy of mixing ratio g/kg (ambient pressure 1013 mbar)..........80
A.9.3 Accuracy of wet bulb temperature °C..................................................80
A.9.4 Accuracy of absolute humidity g/m3.....................................................81
Index................................................................................................................... 83
Warranty............................................................................................................ 85
Technical support............................................................................................ 85
HMT130 User Guide M211280EN-D
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Recycling........................................................................................................... 85
Table of contents
3

List of figures
Figure 1 Main transmitter parts..................................................................................... 12
Figure 2 Opening the transmitter cover......................................................................14
Figure 3 Wall mounting measurements...................................................................... 15
Figure 4 Installation with rain shield............................................................................ 16
Figure 5 Probe Installation with radiation shield...................................................... 17
Figure 6 Probe installation with the duct installation kit........................................18
Figure 7 Probe assembly with duct installation kit..................................................19
Figure 8 Drilling instructions......................................................................................... 20
Figure 9 Optional probe mounting clamp.................................................................. 21
Figure 10 Optional probe mounting flange..................................................................21
Figure 11 HMT130 component board............................................................................22
Figure 12 Power supply and voltage outputs (A), and serial
communication and relay (B)....................................................................... 23
Figure 13 Removing the probe (fixed probe model)................................................55
Figure 14 Removing the probe (remote probe model)........................................... 56
Figure 15 HMT130 output voltage measurement.......................................................57
Figure 16 Adjustment buttons........................................................................................ 59
Figure 17 Fixed probe model dimensions in mm [in]............................................... 74
Figure 18 Remote probe model dimensions in mm [in].......................................... 75
HMT130 User Guide M211280EN-D
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List of tables
Table 1 Document versions (English)...........................................................................7
Table 2 Related manuals.................................................................................................. 7
Table 3 Wiring Table........................................................................................................23
Table 4 Default serial interface settings.................................................................... 25
Table 5 List of serial commands.................................................................................. 28
Table 6 ? command.........................................................................................................30
Table 7 CALCS command..............................................................................................30
Table 8 CDATE command...............................................................................................31
Table 9 CTEXT command.............................................................................................. 32
Table 10 AOUT command................................................................................................32
Table 11 SYSTEM command............................................................................................33
Table 12 VERS command.................................................................................................33
Table 13 R command........................................................................................................ 34
Table 14 S command.........................................................................................................34
Table 15 INTV command..................................................................................................34
Table 16 SEND command................................................................................................ 35
Table 17 CRH command...................................................................................................36
Table 18 CRHCLR command...........................................................................................36
Table 19 CT command...................................................................................................... 37
Table 20 CTCLR command.............................................................................................. 38
Table 21 ACAL command................................................................................................ 38
Table 22 SERI command.................................................................................................. 39
Table 23 ECHO command................................................................................................39
Table 24 SMODE command............................................................................................ 40
Table 25 ENV command.................................................................................................. 40
Table 26 AMODE command.............................................................................................41
Table 27 AERR command................................................................................................42
Table 28 ASEL command.................................................................................................42
Table 29 ATEST command.............................................................................................. 44
Table 30 RSEL command.................................................................................................44
Table 31 RMODE command............................................................................................ 45
Table 32 ROUT command................................................................................................45
Table 33 DSEL command.................................................................................................46
Table 34 FORM command................................................................................................47
Table 35 HELP command.................................................................................................48
Table 36 ERRS command................................................................................................ 48
Table 37 SAVE command.................................................................................................49
Table 38 RESTORE command........................................................................................ 49
Table 39 RESET command.............................................................................................. 50
Table 40 FRESTORE command......................................................................................50
Table 41 UNIT command................................................................................................. 50
Table 42 SERI command................................................................................................... 51
Table 43 SERI2 command.................................................................................................51
Table 44 ECHO command................................................................................................52
Table 45 SMODE command.............................................................................................52
List of tables
5

Table 46 SDELAY command............................................................................................52
Table 47 INTV command..................................................................................................53
Table 48 ADDR command................................................................................................53
Table 49 SEND command................................................................................................ 53
Table 50 OPEN command................................................................................................54
Table 51 CLOSE command..............................................................................................54
Table 52 Error codes, descriptions, and texts............................................................ 67
Table 53 Problems and solutions...................................................................................68
Table 54 HMT130 measurement performance...........................................................70
Table 55 HMT130 operating environment.................................................................... 71
Table 56 HMT130 inputs and outputs............................................................................ 71
Table 57 HMT130 mechanical specifications.............................................................. 72
Table 58 HMT130 spare parts and accessories...........................................................73
Table 59 Temperature dependence for A, m, and Tn............................................... 76
Table 60 Temperature dependence for A, m, and Tn............................................... 77
Table 61 Accuracy of dew point temperature °C...................................................... 79
Table 62 Accuracy of mixing ratio g/kg (ambient pressure 1013 mbar).............80
Table 63 Accuracy of wet bulb temperature °C........................................................ 80
Table 64 Accuracy of absolute humidity g/m3........................................................... 81
HMT130 User Guide M211280EN-D
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1. About this document
1.1 Version information
Table 1 Document versions (English)
Document code Date Description
M211280EN-D December 2021 This version. Information on temperature transmitter
model TMT130 added.
Updated sections:
• Description and example for ct command in Calibration
commands (page 35)
• Temperature measurement accuracy specifications and
spare part probe models in Specifications (page 70)
• Visual and textual style updates
Removed sections:
• Patent notice
• Regulatory compliances (now listed in Specifications
(page 70))
• Adjustment with HMI41 (following the discontinuation of
HMI41)
M211280EN-C January 2018 Previous version. Factory calibration uncertainty
specification updated. Spare parts list updated. Document
template updated, content structure revised.
M211280EN-B June 2013 Previous version. New probe options added. Installation
and operating instructions updated.
1.2 Related manuals
Table 2 Related manuals
Document code Description
M210185EN Vaisala Humidity Calibrator HMK15 User Guide
M210297EN Vaisala Handheld Humidity and Temperature Meter HM70 User Guide
M211060EN Vaisala Humidity and Temperature Probes HMP60 and HMP110 Series User
Guide
Chapter 1 – About this document
7

1.3 Documentation conventions
Warning alerts you to a serious hazard. If you do not read and
follow instructions carefully at this point, there is a risk of injury or even death.
WARNING!
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.
CAUTION!
Note highlights important information on using the product.
Tip gives information for using the product more eciently.
Lists tools needed to perform the task.
Indicates that you need to take some notes during the task.
1.4 Trademarks
Vaisalaâand HUMICAPâare registered trademarks of Vaisala Oyj.
All other product or company names that may be mentioned in this publication are trade
names, trademarks, or registered trademarks of their respective owners.
HMT130 User Guide M211280EN-D
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2. Product overview
2.1 Introduction to HMT130
Vaisala HMT130 Series HUMICAPâHumidity and Temperature Transmitters measure relative
humidity and temperature and convert the measurements to voltage outputs and RS-485.
Other measurement parameters, such as dew point (Td) can be calculated from the basic RH
and T values according to the device configuration. HMT130 is powered with a 10 … 35 V DC or
a 24 V AC supply (15 … 35 V DC or 24 V AC required when using 0 … 10 V output). It outputs
two analog voltage signals with nominal 0 … 10 V range. HMT130 has also an RS-485 digital
interface and a relay.
The HMP110 series measurement probes used with HMT130 incorporate the reliable Vaisala
HUMICAPâhumidity sensor technology.
The HMT130 transmitter's output parameters are configurable. Available parameters for
outputs are limited to two at a time. These two parameters can be used freely at any outputs
(display, service port, and voltage outputs).
Available parameters are RH, T, Td, Td/f, a, x, h, Tw, pws, and pw.
The default output parameters are set at the factory during order time. These factory preset
parameters selections can be changed afterwards via the service port if necessary.
The TMT130 transmitter is a single-parameter model, with temperature as the only output
parameter.
Vaisala relative humidity measurement instruments
The Vaisala range of relative humidity measurement instruments covers all the applications
from ventilation to process control in demanding conditions. For more information about other
Vaisala relative humidity instruments, please contact your Vaisala representative or visit
www.vaisala.com.
2.2 Accessories
The following accessories are optionally available:
• Duct installation kit
• Rain shield with installation kit
• Rain/solar radiation shield installation kit (for pole installation)
• Probe mounting flange
• Probe mounting clamp
• Constant output probe (HMP1100REF, gives constant RH and T values)
More information
‣Spare parts and accessories (page 73)
Chapter 2 – Product overview
9

2.3 Fixed and remote probe models
The transmitter is available either with a fixed probe directly attached to the transmitter
housing or a remote probe with dierent (3/5/10/20 m (10/16/33/66 ft)) cable lengths. All
extension cables can be easily cascaded in order to obtain longer reach.
More information
‣Spare parts and accessories (page 73)
2.4 Optional display
The transmitter is also available with an optional graphical 128×64 pixel resolution LCD display.
The display shows the measurement results of selected parameters in selected units (metric or
non-metric, defined when ordering the transmitter). The parameters are displayed
simultaneously on two separate rows on the display.
More information
‣Transmitter parts (page 11)
2.5 Interchangeable probe
The probes used in the transmitter are fully interchangeable. You can easily remove the probe
and replace it with a new one without having to adjust the transmitter. You have the following
options when purchasing a new probe from Vaisala:
• Order a new probe and keep your current one.
• Order a new probe and return the old one to Vaisala (replacement probe).
Only probes that have a compatible digital output (VDIGI mode) can be used with
the transmitter. Compatible probes have the letter "V" as the first letter in their
order code. The order code is written on the probe.
More information
‣Removing and fastening fixed probe (page 55)
‣Removing and fastening remote probe (page 56)
‣Technical support (page 85)
HMT130 User Guide M211280EN-D
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2.6 Constant output probe
The constant output probe HMP110REF is a testing accessory that can be used to check the
transmitter's functions and measurement signal transfer chain all the way to the control
system. The constant output probe does not measure humidity and temperature; instead, it
outputs constant humidity and temperature readings.
The values output by the constant output probe are specified when ordering. These values are
written on an additional label on the probe body.
The procedure for using the constant output probe is simply to replace the original probe for
the duration of the testing.
1. Disconnect the standard probe from the transmitter.
2. Connect the constant output probe to the transmitter.
3. Check that all used outputs (analog, display, serial line) show the correct measurement
values.
4. After checking the outputs, disconnect the constant output probe and reconnect the
original probe.
The transmitter goes to error state for a short time when the probe is changed.
This is normal.
More information
‣Removing and fastening fixed probe (page 55)
‣Removing and fastening remote probe (page 56)
2.7 Transmitter parts
Figure 1 (page 12) shows the main transmitter parts. On the left is a remote probe model
without display, and on the right is a fixed probe model with the optional display.
Chapter 2 – Product overview
11

3
1
5
2
4
Figure 1 Main transmitter parts
1Transmitter enclosure
2Probe cable
3Probe
4Plastic grid filter
5Cable bushing: cable gland, cable grommet, or conduit fitting
More information
‣Spare parts and accessories (page 73)
2.8 Safety
The transmitter delivered to you has been tested for safety and approved as shipped from the
factory. Note the following precautions:
HMT130 User Guide M211280EN-D
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Do not modify the unit or use it in ways not described in the
documentation. Improper modification or use may lead to safety hazards,
equipment damage, failure to perform according to specification, or decreased
equipment lifetime.
CAUTION!
2.8.1 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. It is possible to
damage the product, however, 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 an ESD workbench is not available, ground yourself to the equipment chassis with a
wrist strap and a resistive connection cord.
• If you are unable to take either of the above precautions, touch a conductive part of the
equipment chassis with your other hand before touching ESD sensitive components.
• Always hold component boards by the edges and avoid touching the component
contacts.
Chapter 2 – Product overview
13

3. Installation
3.1 Opening the transmitter cover
Figure 2 Opening the transmitter cover
To open the transmitter cover:
1. If the transmitter is not mounted already, hold it against a flat surface.
2. Push on the cover with your thumb, and pull the bottom part of the cover towards
yourself.
3.2 Wall mounting
To mount the transmitter on a wall:
HMT130 User Guide M211280EN-D
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1. Remove the transmitter cover.
2. Make sure that the transmitter is correctly aligned and attach it directly to the wall with up
to four screws (not included in the package). Figure 3 (page 15) shows the distances
between attachment points.
It is possible to damage the display when tightening the
screws, as there is not much room between the upper fastening holes and
the exposed display component. Be particularly careful when using a
cordless drill.
CAUTION!
78 [3.1]
91 [3.6]
92 [3.6]
mm
[in]
Figure 3 Wall mounting measurements
Select the size and type of the fastening screws according to the wall
material (for example, wood or stone). Even though using all four screws is
strongly recommended, the transmitter enclosure fastening holes are initially
covered with a thin plastic membrane, so less than four screws could also be
used without sacrificing the ingress protection (IP) class of the enclosure.
The diameter of the fastening screws is typically 3.5 … 4 mm (0.14 … 0.16 in).
More information
‣Opening the transmitter cover (page 14)
Chapter 3 – Installation
15

3.3 Installation with rain shield
The installation kit with rain shield (Vaisala item code 215109) includes a metal mounting plate
and a rain shield for the transmitter.
1
2
3
Figure 4 Installation with rain shield
To install the transmitter with the rain shield:
1. Fasten the metal mounting plate to the wall or pole with screws. Note the arrow on the
mounting plate. Attach the mounting plate with the arrow pointing upwards.
2. Drill holes for the screws in the transmitter frame, and fasten the transmitter to the metal
mounting plate with four (M4) screws.
3. Fasten the rain shield to the metal mounting plate with two (M6) mounting screws.
HMT130 User Guide M211280EN-D
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3.4 Installation with radiation shield
1
2
3
4
5
DTR504 with probe installation kit (Vaisala
item code DTR504A) includes the rain/
solar radiation shield DTR504 and a plastic
installation support for the humidity probe.
If you already have the DTR504 shield and
need only the installation support for the
probe, the installation support is available
with Vaisala item code 227777.
Figure 5 Probe Installation with radiation
shield
1DTR504
2Probe
3Plastic nut
4Installation support (item code
227777)
5Cable tie
To install the probe with a radiation shield:
1. Fasten the probe (2) to the installation support with a cable tie (5).
2. Insert and attach the support to the radiation shield by tightening the plastic nut (3).
3. Attach the entire radiation shield/probe assembly to a pole mast (pole mast diameter:
30 … 60 mm (1.2 … 2.3 in) with a U-bolt and a support arm.
Chapter 3 – Installation
17

3.5 Duct installation kit
The duct installation kit includes a plastic pipe with a flange (Vaisala item code 215619). To
install the probe with the duct installation kit, drill a hole in 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.
L
1
Ø24 [0.9]
mm
[in]
Figure 6 Probe installation with the duct installation kit
1Tension screw
The installation depth (distance L) can be adjusted and locked in place with the tension screw.
HMT130 User Guide M211280EN-D
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