M212259EN-A
User Guide
Vaisala HUMICAPâ Humidity and Temperature
Module
HMM170
PUBLISHED BY
Vaisala Oyj
Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
P.O. Box 26, FI-00421 Helsinki, Finland
+358 9 8949 1
Visit our Internet pages at www.vaisala.com.
© Vaisala Oyj 2019
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
Table of Contents
1. About This Document................................................................................... 5
1.1 Version Information..........................................................................................5
1.2 Related Manuals................................................................................................5
1.3 Documentation Conventions...........................................................................5
1.4 Trademarks........................................................................................................ 6
2. Product Overview........................................................................................... 7
2.1 Introduction to HMM170...................................................................................7
2.2 Basic Features and Options.............................................................................7
2.3 Sensor Types..................................................................................................... 8
2.4 Output Parameters........................................................................................... 9
2.5 Probe Head...................................................................................................... 10
2.6 Chemical Purge............................................................................................... 10
2.7 Filter Types........................................................................................................11
2.8 LED Indicator.....................................................................................................11
2.9 Safety................................................................................................................12
2.9.1 ESD Protection..........................................................................................12
2.10 Regulatory Compliances.................................................................................13
3. Installation........................................................................................................14
3.1 Installing Module............................................................................................. 14
3.2 Installing Probe................................................................................................15
3.3 Vaisala Insight Software................................................................................. 16
3.3.1 Connecting to Insight Software..............................................................16
3.3.2 Configuration Options............................................................................. 16
4. Operation.......................................................................................................... 18
4.1 Using Service Port...........................................................................................18
4.1.1 Installing the Driver for the USB Service Cable....................................18
4.2 Modbus.............................................................................................................19
4.3 Operating with MI70 Indicator.......................................................................19
4.3.1 MI70 Indicator Parts............................................................................... 20
4.3.2 Connecting HMM170 to MI70 Indicator................................................ 20
4.3.3 Basic Display............................................................................................. 21
4.3.4 Graphical Display......................................................................................21
4.3.5 Main Menu................................................................................................ 22
4.3.6 Holding and Saving the Display.............................................................22
4.3.7 Recording Data........................................................................................23
5. Maintenance....................................................................................................24
5.1 Cleaning Probe............................................................................................... 24
5.2 Replacing Filter...............................................................................................24
5.3 Calibration and Adjustment.......................................................................... 25
5.3.1 Adjustment Points and Requirements..................................................26
5.3.2 Adjusting Measurement with Insight Software...................................26
5.3.3 Calibration and Adjustment Using MI70...............................................27
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HMM170 User Guide M212259EN-A
6. Technical Data................................................................................................29
6.1 HMM170 Specifications.................................................................................. 29
6.2 Spare Parts and Accessories......................................................................... 32
Appendix A: Modbus Reference................................................................. 33
A.1 Default Communication Settings................................................................. 33
A.2 Function Codes...............................................................................................33
A.3 Data Encoding.................................................................................................33
A.3.1 32-Bit Floating Point or Integer Format...............................................34
A.3.2 16-Bit Integer Format............................................................................. 34
A.4 Modbus Registers...........................................................................................34
A.4.1 Measurement Data Registers.................................................................35
A.4.2 Configuration Registers..........................................................................37
A.4.3 Device Identification Objects..................................................................41
A.4.4 Test Value Registers................................................................................. 41
A.4.5 Modbus Communication Examples...................................................... 42
Warranty............................................................................................................45
Technical Support........................................................................................... 45
Recycling...........................................................................................................45
2
List of Figures
Figure 1 HMM170 Probe Head Dimensions................................................................ 10
Figure 2 HMM170 Component Board...........................................................................14
Figure 3 HMM170 Probe Installation.............................................................................15
Figure 4 Connecting Module to Insight.......................................................................16
Figure 5 MI70 Indicator Parts........................................................................................20
Figure 6 MI70 Basic Display............................................................................................21
Figure 7 Recording/Viewing Menu..............................................................................23
Figure 8 Accuracy over Temperature Range in Temperature Measurement... 30
Figure 9 Probe Head Dimensions..................................................................................31
Figure 10 Component Board Dimensions.....................................................................31
List of Figures
3
HMM170 User Guide M212259EN-A
List of Tables
Table 1 Document Versions (in English).......................................................................5
Table 2 Related Manuals....................................................................................................5
Table 3 HMM170 Sensor Types.........................................................................................8
Table 4 Availability of Output Parameters................................................................... 9
Table 5 Filter Types and Properties...............................................................................11
Table 6 LED Indicator States...........................................................................................12
Table 7 Measurement Performance.............................................................................29
Table 8 Operating Environment................................................................................... 30
Table 9 Inputs and Outputs........................................................................................... 30
Table 10 Spare Parts and Accessories...........................................................................32
Table 11 Default Modbus Serial Communication Settings.......................................33
Table 12 Modbus Function Codes...................................................................................33
Table 13 16-bit Signed Integer Format Details........................................................... 34
Table 14 Modbus Measurement Data Registers (Read-Only).................................35
Table 15 Modbus Configuration Data Registers (Writable).....................................37
Table 16 Device Identification Objects.......................................................................... 41
Table 17 Modbus Test Registers (Read-Only)..............................................................41
4
Chapter 1 – About This Document
1. About This Document
1.1 Version Information
This document provides instructions for installing, operating, and maintaining Vaisala
HUMICAPâ Humidity and Temperature Module HMM170.
Table 1 Document Versions (in English)
Document Code Date Description
M212259EN-A June 2019 First version.
1.2 Related Manuals
Table 2 Related Manuals
Document Code Name
M212260EN HMM170 Quick Guide
1.3 Documentation Conventions
WARNING!
follow instructions carefully at this point, there is a risk of injury or even death.
CAUTION!
follow instructions carefully at this point, the product could be damaged or
important data could be lost.
Note highlights important information on using the product.
Tip gives information for using the product more eciently.
Warning alerts you to a serious hazard. If you do not read and
Caution warns you of a potential hazard. If you do not read and
5
HMM170 User Guide M212259EN-A
Lists tools needed to perform the task.
Indicates that you need to take some notes during the task.
1.4 Trademarks
Vaisalaâ and HUMICAPâ are 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.
6
Chapter 2 – Product Overview
2. Product Overview
2.1 Introduction to HMM170
Vaisala HUMICAPâ Humidity and Temperature Module HMM170 is an open frame OEM module
for integration into demanding environmental chambers and harsh conditions. The module
provides a digital RS-485/Modbus RTU output and three freely configurable analog output
channels. The module provides relative humidity, temperature, dew point, and other calculated
parameters.
HMM170 probe covers the full temperature range -70 ... +180 °C (-94 ... +356 °F) used in
climate chambers and the whole humidity range up to condensation. The small probe and
compact component board oer easy and flexible installation. The probe cable options (2, 5,
or 10 m (6.5, 16.4, or 32.8 ft)) oer excellent cost optimization and flexibility to any OEM
application. By ordering HMM170 with the appropriate sensor, you can use the module in
environments that are frequently sterilized with vaporized hydrogen peroxide (H2O2) or to
measure humidity in oil medium, for example, for transformer and engine monitoring
applications.
The latest general purpose HUMICAPâ R2 sensor has an improved corrosion resistance. The
sensor can tolerate typical chemicals, such as cleaning agents used in climate chambers. The
automatic sensor chemical purge function keeps the sensor clean from typical chemical fumes
and the additional probe warming function prevents condensation. In case HMM170 gets in
contact with water, the automatic heating rapidly dries the sensor to enable fast and accurate
humidity measurement.
HMM170 is easy to install and convenient to use. It provides both digital and analog outputs for
multiple needs. An integrated service port enables a quick and simple way to configure, check,
and calibrate the module with the help of a USB cable and Vaisala Insight software.
2.2
Basic Features and Options
• Three humidity sensor types:
• Vaisala HUMICAPâ R2C (general use)
• Vaisala HUMICAPâ 180VC (for H2O2 use)
• Vaisala HUMICAPâ 180L2 (for moisture in oil)
• Sensor purge provides superior chemical resistance
• Probe and sensor warming functions minimize condensation on probe
• Analog output options:
• 0/4 ... 20 mA
• 0/1 ... 5 V
• 0 ... 5/10 V
• Probe cable lengths:
• 2, 5, or 10 m (6.5, 16.4, or 32.8 ft)
• Various filter types
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HMM170 User Guide M212259EN-A
• Service port for maintenance
• Supports Vaisala MI70 Handheld Measurement Indicator
• Optional USB cable for easy connection to Vaisala Insight software for configuration,
diagnostics, and temporary online monitoring
2.3 Sensor Types
HMM170 is available with three dierent sensor types.
Table 3 HMM170 Sensor Types
Sensor Type Description
HUMICAPâ R2C A general purpose industrial humidity sensor with high humidity
HUMICAPâ 180L2 A sensor that is optimized for measurement of humidity in oil
HUMICAPâ 180VC A composite humidity sensor with catalytic surface for use in
durability, good long term stability, and good tolerance against
chemical exposure.
medium. It has good tolerance against chemicals and moderate
humidity durability.
The HUMICAPâ 180L2 sensor measures moisture in oil in terms
of the water activity (aw) and temperature (T). Water activity
indicates directly whether there is a risk of free water formation.
The measurement is also independent of oil type and age. In
addition to water activity, the HMM170 can output ppm, the
average mass concentration of water in oil.
The HUMICAPâ 180L2 sensor does not support probe heating or
chemical purge.
applications where the sensor is exposed to H2O2 (hydrogen
peroxide).
Catalytic HUMICAPâ 180VC sensor is a good choice when you
want to measure RH between bio-decontamination cycles and
you are not interested in saturation level of the air mixture during
the bio-decontamination phase. Catalytic layer protects the
sensor during the bio-decontamination phase. Catalytic layer
catalyzes H2O2 into water vapor and oxygen. Therefore, the
sensing polymer detects only water vapor and shows correct
Relative Humidity value.
8
Chapter 2 – Product Overview
2.4 Output Parameters
Output parameter is available
Value of output parameter is locked unless temperature is written to register 0334
external source
Value of output parameter is locked
Output parameter is not valid for sensor type
Table 4 Availability of Output Parameters
from an
hex
Output Parameter HUMICAPâ R2C and 180VC Sensor HUMICAPâ
Normal
Operation
Relative humidity
Temperature
Dew point temperature
Dew/frost point temperature
Dew/frost point temperature at 1 atm
Dew point temperature at 1 atm
Absolute humidity
Mixing ratio
Wet-bulb temperature
Water concentration
Water vapor pressure
Water vapor saturation pressure
Enthalpy
Water activity
Dew point temperature dierence
Absolute humidity at NTP
Water concentration in oil
Relative saturation
Water mass fraction
During
Heating
During
Purge
180L2
Sensor
9
mm
[in]
Ø 12
[0.47]
99.5 [3.92]
79.5 [3.13]
37.5 [1.48]
Groove for
lock ring
Ø 12
[0.47]
Ø 5
[0.2]
HMM170 User Guide M212259EN-A
2.5 Probe Head
Figure 1 HMM170 Probe Head Dimensions
HMM170 is designed for applications that involve constant high humidity or rapid changes in
humidity, such as drying and test chambers, combustion air, and other humidifiers and
meteorological measurements, where measurement performance and chemical tolerance are
essential.
• Temperature measurement range −70 ... +180 °C (−94 ... +356 °F)
• Operating temperature range for probe −70 ... +180 °C (−94 ... +356 °F)
• Probe and sensor warming functions minimize condensation on probe
• Vapor and pressure proof construction
• Stainless steel mesh filter standard in delivery
Probe Heating
HMM170 supports probe heating. Probe heating heats up not only the sensor, but the entire
probe head. When probe temperature is heated above dew point temperature, condensation
on the probe can be avoided while measuring the dew point temperature of the process.
Probe heating is normally disabled. If you select to enable probe heating, output parameters
that are dependent on temperature measurement (such as relative humidity) are disabled,
unless the true temperature of the measured environment is updated to the temperature
compensation register of the probe from another measurement instrument. Output
parameters that can be measured or calculated without this external temperature information
(such as dew point temperature) are available even without the temperature input.
2.6
Chemical Purge
Chemical purge is a 4-minute process where the sensors are heated to remove possible
contamination. The purge is essential for the long-term performance and accuracy of the
probe. During the purge, measurements are not available.
Depending on the selected sensor, the purge is automatically performed:
• At probe start-up
• At probe start-up and after every 24 hours
10
Chapter 2 – Product Overview
The HUMICAPâ 180L2 sensor does not support chemical purge.
You can trigger a purge manually at any time with Vaisala Insight software or Modbus, or by
closing the external purge trigger on the component board.
2.7 Filter Types
All filters available for the HMM170 are 12 mm (0.47 in) in diameter. Note the operational
temperature range of each filter.
Table 5 Filter Types and Properties
Filter Type Diameter Pore Size Temperature Range
PPS plastic grid
with stainless steel
net
12 mm
(0.47 in)
15 µm −70 ... +180 °C
(−94 ... +356 °F)
Stainless steel
sintered
Stainless steel
filter for moisture
in oil
Porous PTFE
(general purpose)
More Information
‣
Spare Parts and Accessories (page 32)
2.8
LED Indicator
12 mm
(0.47 in)
12 mm
(0.47 in)
12 mm
(0.47 in)
38 µm −70 ... +180 °C
(−94 ... +356 °F)
3.15 mm −70 ... +180 °C
(−94 ... +356 °F)
8 µm −70 ... +180 °C
(−94 ... +356 °F)
The LED indicator on the component board provides a visual indication of the status of the
HMM170. The alarm LED functionality is preset at the factory according to order form.
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HMM170 User Guide M212259EN-A
Table 6 LED Indicator States
LED Color Meaning
Not lit Module is powered o or LED functionality is disabled.
Green Module is powered on and ready for operation.
Green and blinking Module is powering up or communicating with the probe.
Red Module is in error state.
You can use Vaisala Insight software to disable the LED indicator.
2.9 Safety
This product has been tested for safety. Note the following precautions:
WARNING!
to minimize shock hazard.
CAUTION!
documentation. Improper modification may lead to safety hazards, equipment
damage, failure to perform according to specification, or decreased equipment
lifetime.
Ground the product and verify installation grounding periodically
Do not modify the unit or use it in ways not described in the
2.9.1 ESD Protection
Electrostatic Discharge (ESD) can damage 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 in the
equipment housing.
To avoid delivering high static voltages to the product:
• Handle ESD-sensitive components on a properly grounded and protected ESD workbench
or by grounding yourself to the equipment chassis with a wrist strap and a resistive
connection cord.
• If you are unable to take either precaution, touch a conductive part of the equipment
chassis with your other hand before touching ESD-sensitive components.
• Hold component boards by the edges and avoid touching component contacts.
12
Chapter 2 – Product Overview
2.10 Regulatory Compliances
HMM170 is in conformity with the provisions of the following EU directive(s):
• RoHS Directive
• WEEE Directive
Electromagnetic compatibility of HMM170 has been tested according to the following product
family standard:
EN61326-1 Electrical equipment for measurement, control and laboratory use - EMC
requirements - for use in light industrial environments.
The Electrostatic Discharge test (EN 61000-4-2) was not applied to the open frame module. In
the final product the module PC-board should be installed in a user restricted location /
enclosure for continued ESD protection.
13
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