Vaisala HMP User Manual

M212022EN-F

User Guide

Vaisala Indigo compatible

humidity and temperature probes

HMP Series with MMP8 and TMP1

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.

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.....................................................................................9

1.1 Version information..........................................................................................9

1.2 Related manuals..............................................................................................10

1.3 Documentation conventions..........................................................................10

1.4 Trademarks........................................................................................................11

2. Product overview...........................................................................................12

2.1 Probe structure................................................................................................12

2.2 Basic features and options............................................................................. 12

2.3 Output parameters..........................................................................................13

2.4 Additional features with Indigo transmitters...............................................14

2.5 Safety................................................................................................................ 15

2.6 ESD protection.................................................................................................15

2.7 Regulatory statements................................................................................... 15

2.7.1 FCC Part 15 compliance statement........................................................ 15

2.7.2 Canada ICES-003 compliance statement............................................. 16

3. Functional description.................................................................................17

3.1 HUMICAP technology......................................................................................17

3.2 Chemical purge................................................................................................17

3.3 Condensation prevention functions.............................................................. 18

4. Installation.......................................................................................................20

4.1 Probe holder ASM213582................................................................................21

4.1.1 Mounting the probe body using probe holder ASM213582................ 21

4.2 Wiring...............................................................................................................22

4.3 HMP1 probe......................................................................................................23

4.4 HMP3 probe.....................................................................................................24

4.5 HMP4 probe.................................................................................................... 25

4.6 HMP5 probe.....................................................................................................26

4.7 HMP7 probe..................................................................................................... 27

4.8 HMP8 probe.................................................................................................... 29

4.8.1 Attaching ball valve kit to process........................................................30

4.9 HMP9 probe......................................................................................................31

4.9.1 Installing HMP9 through a cable gland.................................................32

4.9.2 Overview of HMP9 Duct Installation Kit............................................... 33

4.9.3 Mounting HMP9 probe head with Duct Installation Kit......................34

4.10 MMP8 probe.................................................................................................... 36

4.11 TMP1 probe......................................................................................................37

4.12 DTR502B solar radiation shield.....................................................................37

4.12.1 Mounting probe head inside DTR502B................................................ 38

5. Conﬁguration with Insight software......................................................41

5.1 Vaisala Insight software..................................................................................41

5.2 Connecting to Insight software.....................................................................41

5.3 Conﬁguration options....................................................................................42

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

5.4 Conﬁguring condensation prevention.........................................................42

5.5 Diagnostics in Insight.....................................................................................43

6. Using probe with Indigo transmitters..................................................45

6.1 Indigo200 series transmitters...................................................................... 45

6.1.1 Attaching probe to Indigo200 series transmitter............................... 47

6.2 Indigo500 series transmitters...................................................................... 48

7. Maintenance....................................................................................................49

7.1 Cleaning the probe.........................................................................................49

7.1.1 Chemical tolerance................................................................................. 49

7.2 Changing the probe ﬁlter..............................................................................50

7.3 Replacing the HUMICAPâ R2 sensor.......................................................... 50

7.4 Calibration and adjustment........................................................................... 52

7.4.1 Adjustment points and requirements...................................................53

7.4.2 HMK15 Humidity Calibrator with HMP Series probes .........................53

7.4.3 Adjusting measurement with Insight software................................... 55

7.4.4 Adjusting measurement with Indigo200 series transmitter..............56

8. Troubleshooting............................................................................................. 61

8.1 Problem situations...........................................................................................61

8.2 Error messages................................................................................................61

8.3 Restoring factory default settings................................................................63

9. Technical data................................................................................................64

9.1 HMP1 speciﬁcations........................................................................................64

9.2 HMP3 speciﬁcations....................................................................................... 67

9.3 HMP4 speciﬁcations....................................................................................... 70

9.4 HMP5 speciﬁcations....................................................................................... 74

9.5 HMP7 speciﬁcations....................................................................................... 77

9.6 HMP8 speciﬁcations........................................................................................ 81

9.7 HMP9 speciﬁcations....................................................................................... 85

9.8 MMP8 speciﬁcations...................................................................................... 89

9.9 TMP1 speciﬁcations......................................................................................... 91

9.10 Accessories and spare parts......................................................................... 94

Appendix A:

Modbus reference..................................................................99

A.1 Default communication settings.................................................................. 99

A.2 Function codes...............................................................................................99

A.3 Data encoding................................................................................................ 99

A.3.1 32-bit ﬂoating point or 32-bit integer format................................... 100

A.3.2 16-bit integer format.............................................................................100

A.4 Modbus registers........................................................................................... 101

A.4.1 Measurement data registers..................................................................101

A.4.2 Conﬁguration registers.........................................................................104

A.4.3 Status registers...................................................................................... 107

A.4.4 Test value registers................................................................................108

A.5 Device identiﬁcation objects.......................................................................108

Table of contents

A.6 Exception responses....................................................................................109

A.7 Modbus communication examples..............................................................110

Maintenance and calibration services........................................................113

Warranty........................................................................................................... 113

Technical support........................................................................................... 113

Recycling...........................................................................................................113

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

List of ﬁgures

Figure 1 Probe parts........................................................................................................12

Figure 2 Example installation.......................................................................................20

Figure 3 Probe holder ASM213582 dimensions........................................................21

Figure 4 M12 5-pin A-coded male connector pinout............................................. 22

Figure 5 RS-485 wiring.................................................................................................. 23

Figure 6 HMP1 probe dimensions................................................................................23

Figure 7 HMP3 probe dimensions...............................................................................24

Figure 8 HMP4 probe dimensions...............................................................................25

Figure 9 HMP5 probe dimensions...............................................................................26

Figure 10 Optional mounting ﬂange 210696 dimensions...................................... 26

Figure 11 HMP7 probe dimensions...............................................................................27

Figure 12 HMP8 probe dimensions...............................................................................29

Figure 13 HMP9 probe dimensions................................................................................31

Figure 14 Installing HMP9 probe head through a cable gland..............................32

Figure 15 Duct Installation Kit ASM214055 dimensions......................................... 33

Figure 16 Duct installation overview............................................................................34

Figure 17 MMP8 dimensions...........................................................................................36

Figure 18 TMP1 probe dimensions.................................................................................37

Figure 19 DTR502B dimensions.................................................................................... 38

Figure 20 Mounting DTR502B on a pole mast...........................................................39

Figure 21 HMP9 probe head with sensor head support 215130...........................40

Figure 22 Connecting probe to Insight using Indigo USB adapter.......................41

Figure 23 HMP5 in Insight software..............................................................................42

Figure 24 HMP5 diagnostics in Insight (advanced mode)..................................... 44

Figure 25 Probe attached to Indigo200 series transmitter directly....................45

Figure 26 Probe attached to Indigo200 series transmitter with a cable...........46

Figure 27 Attaching the probe to Indigo200 series transmitter.......................... 47

Figure 28 Attaching probes to Indigo500 transmitter........................................... 48

Figure 29 HMP3 probe head with ﬁlter removed.......................................................51

Figure 30 HMP5 calibration with HMK15 using 211302SP adapter.......................54

Figure 31 Using HMP9 calibration adapter with HMK15......................................... 55

Figure 32 Calibration page in the Indigo200 wireless

conﬁguration interface..................................................................................59

Figure 33 HMP1 humidity measurement accuracy as a function of

Figure 34 HMP1 temperature measurement accuracy over full range................ 65

Figure 35 HMP1 probe dimensions................................................................................66

Figure 36 HMP3 humidity measurement accuracy as a function of

Figure 37 HMP3 temperature measurement accuracy over full range............... 68

Figure 38 HMP3 probe dimensions...............................................................................70

Figure 39 HMP4 humidity measurement accuracy as a function of

Figure 40 HMP4 temperature measurement accuracy over full range................ 71

Figure 41 HMP4 probe dimensions...............................................................................73

temperature.....................................................................................................64

temperature..................................................................................................... 68

temperature.......................................................................................................71

Figure 42 HMP5 humidity measurement accuracy as a function of

temperature......................................................................................................75

Figure 43 HMP5 temperature measurement accuracy over full range................75

Figure 44 HMP5 probe dimensions...............................................................................77

Figure 45 HMP7 humidity measurement accuracy as function of

temperature......................................................................................................78

Figure 46 HMP7 temperature measurement accuracy over full range............... 79

Figure 47 HMP7 probe dimensions................................................................................81

Figure 48 HMP8 humidity measurement accuracy as a function of

temperature......................................................................................................82

Figure 49 HMP8 temperature measurement accuracy over full range............... 82

Figure 50 HMP8 probe dimensions...............................................................................84

Figure 51 Optional ball valve installation kit dimensions.......................................85

Figure 52 HMP9 humidity measurement accuracy as a function of

temperature..................................................................................................... 86

Figure 53 HMP9 temperature measurement accuracy over full range...............86

Figure 54 HMP9 probe dimensions...............................................................................88

Figure 55 MMP8 Aw measurement accuracy............................................................. 89

Figure 56 MMP8 dimensions............................................................................................91

Figure 57 TMP1 temperature measurement accuracy over full range.................92

Figure 58 TMP1 probe dimensions................................................................................94

Figure 59 Optional duct kit 215003 dimensions....................................................... 94

List of ﬁgures

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

List of tables

Table 1 Document versions (English)...........................................................................9

Table 2 Related manuals................................................................................................ 10

Table 3 Availability of output parameters..................................................................13

Table 4 Suitability of cleaning agents........................................................................49

Table 5 Troubleshooting table...................................................................................... 61

Table 6 HMP1 measurement performance................................................................64

Table 7 HMP1 operating environment........................................................................65

Table 8 HMP1 inputs and outputs................................................................................ 65

Table 9 HMP1 output parameters................................................................................ 65

Table 10 HMP1 compliance..............................................................................................66

Table 11 HMP1 mechanical speciﬁcations...................................................................66

Table 12 HMP3 measurement performance............................................................... 67

Table 13 HMP3 operating environment.......................................................................68

Table 14 HMP3 inputs and outputs...............................................................................69

Table 15 HMP3 output parameters............................................................................... 69

Table 16 HMP3 compliance............................................................................................. 69

Table 17 HMP3 mechanical speciﬁcations.................................................................. 69

Table 18 HMP4 measurement performance...............................................................70

Table 19 HMP4 operating environment....................................................................... 72

Table 20 HMP4 inputs and outputs............................................................................... 72

Table 21 HMP4 output parameters............................................................................... 72

Table 22 HMP4 compliance............................................................................................. 73

Table 23 HMP4 mechanical speciﬁcations.................................................................. 73

Table 24 HMP5 measurement performance............................................................... 74

Table 25 HMP5 operating environment....................................................................... 75

Table 26 HMP5 inputs and outputs............................................................................... 76

Table 27 HMP5 output parameters............................................................................... 76

Table 28 HMP5 compliance............................................................................................. 76

Table 29 HMP5 mechanical speciﬁcations.................................................................. 76

Table 30 HMP7 measurement performance............................................................... 77

Table 31 HMP7 operating environment....................................................................... 79

Table 32 HMP7 inputs and outputs............................................................................... 79

Table 33 HMP7 output parameters............................................................................... 79

Table 34 HMP7 compliance.............................................................................................80

Table 35 HMP7 mechanical speciﬁcations..................................................................80

Table 36 HMP8 measurement performance................................................................81

Table 37 HMP8 operating environment.......................................................................83

Table 38 HMP8 inputs and outputs............................................................................... 83

Table 39 HMP8 output parameters............................................................................... 83

Table 40 HMP8 compliance.............................................................................................84

Table 41 HMP8 mechanical speciﬁcations..................................................................84

Table 42 HMP9 measurement performance...............................................................85

Table 43 HMP9 operating environment.......................................................................86

Table 44 HMP9 inputs and outputs............................................................................... 87

Table 45 HMP9 output parameters............................................................................... 87

Table 46 HMP9 compliance............................................................................................. 87

Table 47 HMP9 mechanical speciﬁcations..................................................................88

Table 48 MMP8 measurement performance.............................................................. 89

Table 49 MMP8 operating environment.......................................................................89

Table 50 MMP8 inputs and outputs.............................................................................. 90

Table 51 MMP8 compliance............................................................................................ 90

Table 52 MMP8 mechanical speciﬁcations................................................................. 90

Table 53 TMP1 measurement performance................................................................. 91

Table 54 TMP1 operating environment.........................................................................92

Table 55 TMP1 inputs and outputs.................................................................................92

Table 56 TMP1 compliance...............................................................................................93

Table 57 TMP1 mechanical speciﬁcations....................................................................93

Table 58 Connection cables............................................................................................ 95

Table 59 HMP3 accessories............................................................................................. 95

Table 60 HMP3 spare parts..............................................................................................95

Table 61 HMP4 spare parts............................................................................................. 96

Table 62 HMP5 accessories............................................................................................. 96

Table 63 HMP5 spare parts..............................................................................................96

Table 64 HMP7 accessories............................................................................................. 96

Table 65 HMP7 spare parts..............................................................................................97

Table 66 HMP8 accessories............................................................................................. 97

Table 67 HMP8 spare parts..............................................................................................97

Table 68 HMP9 accessories............................................................................................. 97

Table 69 MMP8 accessories.............................................................................................98

Table 70 MMP8 spare parts............................................................................................. 98

Table 71 TMP1 accessories...............................................................................................98

Table 72 Default Modbus serial communication settings.......................................99

Table 73 Modbus function codes...................................................................................99

Table 74 Interpretation of 16-bit signed integer values........................................ 100

Table 75 Floating point measurement data registers (read-only)...................... 101

Table 76 Integer measurement data registers (read-only).................................. 103

Table 77 Modbus conﬁguration data registers (writable).................................... 104

Table 78 Modbus status data registers (read-only)................................................107

Table 79 Error codes in register 0203

................................................................... 108

hex

Table 80 Modbus test registers (read-only)..............................................................108

Table 81 Device identiﬁcation objects....................................................................... 108

Table 82 Modbus exception responses......................................................................109

List of tables

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

Chapter 1 – About this document

1. About this document

1.1 Version information

This document provides instructions for installing, using, and maintaining Vaisala HUMICAPâ Humidity and Temperature Probes HMP1, HMP3, HMP4, HMP5, HMP7, HMP8, HMP9, Moisture in Oil Probe MMP8, and Temperature Probe TMP1.

Table 1 Document versions (English)

Document code Date Description

M212022EN-F March 2021 Applicable from software version 1.2.0 onward. Added

content for HMP1 probe model and updated technical data for all models.

Added sections:

• HUMICAP technology (page 17)

• Chemical purge (page 17)

• Condensation prevention functions (page 18)

• Mounting the probe body using probe holder

ASM213582 (page 21)

• Conﬁguring condensation prevention (page 42)

• HMK15 Humidity Calibrator with HMP Series probes

(page 53)

Updated sections:

• Product overview (page 12)

• Probe structure (page 12)

• Output parameters (page 13)

• Installation (page 20)

• HMP7 probe (page 27)

• Indigo200 series transmitters (page 45)

• Indigo500 series transmitters (page 48)

• Vaisala Insight software (page 41)

• Problem situations (page 61)

• Restoring factory default settings (page 63)

• Measurement data registers (page 101)

• Conﬁguration registers (page 104)

• Status registers (page 107)

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

Document code Date Description

M212022EN-E June 2020 Added sections:

• DTR502B solar radiation shield (page 37)

• Mounting probe head inside DTR502B (page 38)

• Diagnostics in Insight (page 43)

• Indigo500 series transmitters (page 48)

• Exception responses (page 109)

• Maintenance and calibration services (page 113)

Updated sections:

• Additional features with Indigo transmitters (page 14)

• Using probe with Indigo transmitters (page 45)

• Corrected CRC values in section Modbus communication

examples (page 110)

M212022EN-D March 2020 Added content for HMP3 and MMP8 probe models.

1.2 Related manuals

Table 2 Related manuals

Document code Name

M211982EN HMP Series with MMP8 and TMP1 Quick Guide

M211877EN Indigo201 Analog Output Transmitter User Guide

M211966EN Indigo202 Digital Transmitter User Guide

M212287EN Indigo520 Transmitter User 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.

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

Chapter 1 – About this document

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

Vaisalaâ and HUMICAPâ are registered trademarks of Vaisala Oyj.

Modbusâ is a registered trademark of Schneider Automation Inc.

All other product or company names that may be mentioned in this publication are trade names, trademarks, or registered trademarks of their respective owners.

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

2. Product overview

HMP series probes are humidity and temperature measurement probes with a digital output (Modbusâ protocol). The probes are designed for demanding humidity and temperature measurement applications. The probes have a two-part structure, with measurement electronics contained in the probe body and sensor(s) in the probe head. The probe body and the probe head are connected by a cable, except on the HMP1 model. Length options for this connecting cable depend on the probe model.

The probes are compatible with Vaisala Indigo transmitters. They can also be connected to Vaisala Insight software for conﬁguration, calibration, adjustment, diagnostics, and temporary online monitoring.

2.1 Probe structure

Figure 1 Probe parts

1 Protection cap (remove before use) 2 5-pin M12 connector 3 Probe body with type label 4 Status indicator LED:

Green Power on and probe online,

Red Error

O Power o, or indicator

5 Probe cable. HMP1 model does not

have a probe cable, as its probe head

is directly attached to the probe body.

6 Probe head (HMP7 model shown) 7 Location of sensor(s) on the probe

head. Other probe models have a

removable ﬁlter over the sensors but

HMP1, HMP9, and TMP1 do not.

8 Protection cap (remove before use)

ﬂashes when communicating

disabled

To prevent the warming of the indicator LED from causing a slight measurement

2.2 Basic features and options

error, HMP1 keeps the indicator normally o (even when power is on). If the probe is in error state, the red LED is shown.

• Comprehensive list of output parameters. See Output parameters (page 13).

Chapter 2 – Product overview

• Sensor purge provides superior chemical resistance (HMP models only)

• Condensation prevention feature minimizes condensation on probe (HMP models with composite sensors only)

• Traceable calibration certiﬁcate:

• HMP and MMP models: 6 points for humidity, 1 point for temperature

• TMP1: 2 points for temperature

• Standalone Modbusâ RTU over RS-485

• Compatible with Indigo series of transmitters

• Can be connected to Vaisala Insight PC software for conﬁguration, calibration, diagnostics, and temporary online monitoring

2.3 Output parameters

On HMP probe models, the values of all available output parameters are locked when the sensor is being warmed by the chemical purge function.

Output parameter is available on this model. Output parameter is available on this model, but its value is unavailable when condensation prevention functions are warming the sensor. Writing temperature to Modbus register 0334

condensation prevention. Output parameter is not available on this model.

Table 3 Availability of output parameters

from an external source makes the output value available during

hex

Output parameter Output unit HMP1, 3, 4, 5,

Absolute humidity

Absolute humidity at NTP

Dew/frost point temperature °C

Dew/frost point temperature at 1 atm °C

Dew point temperature °C

Dew point temperature at 1 atm °C

Dew point temperature dierence °C

Enthalpy kJ/kg

Mixing ratio g/kg

Relative humidity %RH

Relative humidity (dew/frost) %RH

Relative saturation %RS

g/m

7, 8, and 9

MMP8 TMP1

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

Output parameter Output unit HMP1, 3, 4, 5,

Temperature °C

Water activity -

Water concentration ppm

Water concentration in oil ppm

Water concentration (wet basis) vol-%

Water mass fraction ppm

Wet-bulb temperature °C

Water vapor pressure hPa

Water vapor saturation pressure hPa

7, 8, and 9

MMP8 TMP1

2.4 Additional features with Indigo transmitters

Connecting the probe to an Indigo transmitter provides a wide range of additional options for outputs, measurement viewing, status monitoring, and conﬁguration interface access.

Examples of additional features available with Indigo500 series transmitters:

• Touchscreen display for real-time data viewing and conﬁguration

• Support for 2 probes simultaneously

• 4 conﬁgurable analog outputs

• 2 conﬁgurable relays

• Ethernet connection with web interface for remote access

• Modbus TCP/IP protocol

Examples of additional features available with Indigo200 series transmitters:

• 3.5” TFT LCD color display or non-display model with LED indicator

• Digital output or 3 analog outputs (depending on the transmitter model)

• 2 conﬁgurable relays

• Wireless browser-based conﬁguration interface for mobile devices and computers (IEEE

802.11 b/g/n WLAN)

Available features vary depending on the Indigo transmitter model. For more information on Indigo transmitters, see www.vaisala.com/indigo.

2.5 Safety

Chapter 2 – Product overview

WARNING!

has not been exposed to dangerous contamination, and is safe to handle without special precautions.

CAUTION!

serviceable parts inside the probe body.

CAUTION!

deposit impurities on the probe head.

CAUTION!

condensation prevention heating or chemical purge functions are active.

When returning a product for calibration or repair, make sure it

Do not attempt to open the probe body. There are no user

Do not touch the probe head with your bare hands. Touching will

Be aware that the probe head may become hot to touch when

2.6 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 an electrostatic discharge when touching, removing or inserting any objects inside the equipment housing.

Avoid touching component contacts or connectors when working with the device.

2.7

Regulatory statements

2.7.1 FCC Part 15 compliance statement

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. 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 the 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 o and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit dierent from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

CAUTION!

by the party responsible for compliance could void the user's authority to operate the equipment.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modiﬁcations to this equipment not expressly approved

2.7.2 Canada ICES-003 compliance statement

This Class B digital apparatus complies with Canadian ICES‑003.

Cet appareil numerique de la classe B est conforme a la norme NMB‑003 du Canada.

Chapter 3 – Functional description

3. Functional description

3.1 HUMICAP technology

Vaisala HUMICAPâ is a capacitive thin-ﬁlm polymer sensor consisting of a substrate on which a thin ﬁlm of polymer is deposited between two conductive electrodes. The sensing surface is coated with a porous metal electrode to protect it from contamination and exposure to condensation. The substrate is typically glass or ceramic.

The thin-ﬁlm polymer either absorbs or releases water vapor as the relative humidity of the measurement environment rises or falls. The dielectric properties of the polymer ﬁlm depend on the amount of absorbed water. As the relative humidity around the sensor changes, the dielectric properties of the polymer ﬁlm change, and so does the capacitance of the sensor. Capacitance is converted into a humidity reading. The HUMICAP sensor is complemented by a temperature sensor, which is bonded together with the capacitive polymer on some of the sensor variants. Additional output parameters such as dew point are calculated from the readings measured by the sensors.

HUMICAP sensors with bonded temperature sensors are also known as composite sensors. Probes with composite sensors can use the chemical purge function to maintain sensor performance. They also implement condensation prevention functions that are a key element in achieving an excellent stability and good condensation resistance in high humidity applications.

The integrated sensor arrangement on the HMP1 and HMP9 probes is dierent from the composite sensors used in the other HMP probes. However, they are also capable of using condensation prevention heating and chemical purge.

3.2

Chemical purge

Chemical purge heats the sensor to a high temperature, which evaporates excess molecules out of the sensor polymer. This minimizes the drift at the wet end of humidity readings, and removes contaminants from the sensor element. The heating phase is followed by a cooling phase where the sensor cools down to ambient temperature.

During chemical purge the values of the output parameters stay frozen at their last measured values. Chemical purge takes a few minutes to complete, after which measurement continues normally and updated values of output parameters are again available.

When ordered with chemical purge enabled, HMP model probes perform the purge at one day intervals (known as interval purge). If desired, chemical purge can also be performed when the probe is powered on (known as startup purge). Purge settings can be conﬁgured with Insight software or using Modbus protocol.

To allow the chemical purge to be completed in a reasonable time, it will not be started if the ambient temperature is below 0 °C (+32 °F).

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

3.3 Condensation prevention functions

Condensation prevention heating prevents water from condensing on the sensor and interfering with humidity measurement. Use of condensation prevention is controlled by a single setting that can be changed with Insight software or using Modbus protocol. The setting is only available if your probe supports condensation prevention.

By default, condensation prevention is o. However, the HMP7 model can be ordered from Vaisala with the feature enabled.

When condensation prevention is enabled, the probe will automatically use its available condensation prevention functions. When warming is active, values of output parameters that depend on temperature measurement (for example, relative humidity) are unavailable unless temperature is written to register 0334

be measured or calculated without this external temperature information, such as dew point temperature, are available even without the temperature input.

Sensor warming

Sensor warming is available to all HMP series probes with composite sensors, HMP1, and HMP9. Warms the humidity sensor when necessary to keep its temperature above the dew point of the measurement environment. When sensor warming is activated, all temperature dependent output parameters become unavailable unless external temperature information is provided to the probe. The output parameters become available again 4 minutes after the warming is stopped.

Sensor warming is intended for improving the condensation tolerance of the probe in measurement environments that may occasionally cause condensation to form. It is not intended for environments where continous warming is needed.

from an external source. Output parameters that can

hex

Probe heating

Probe heating is available on HMP7 model only. Probe heating warms up the entire probe head instead of just the sensor. It is intended for use in challenging measurement environments where condensation on the probe would otherwise present a problem.

Probe heating always applies some heating power even when the sensor is not near condensation, so temperature-dependent output parameters are permanently unavailable when probe heating is used, unless external temperature information is provided to the probe.

If the ambient dew point rises close to current sensor temperature, the heating power is increased to avoid condensation. Heating power also increases as supply voltage increases.

If you use probe heating, be sure to mount the HMP7 probe head in a way that prevents the heat from being conducted away from the probe. Tightly connecting the HMP7 probe head to a metal structure may prevent the probe from maintaining probe temperature above the dew point. It will also heat the structure which may be undesirable.

Even if condensation prevention has been turned on, probe heating is not active if supply voltage is below 18 V DC. For example, this is the case when HMP7 probe is connected to Insight software using the Indigo USB Adapter.

More information

‣

Conﬁguring condensation prevention (page 42)

Chapter 3 – Functional description

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

4. Installation

When you choose the installation location for the probe, consider the following:

• Verify the operating environment speciﬁcation of the probe model. The probe head typically has a much wider operating temperature range than the probe body.

• If the temperature of the measured environment diers greatly from ambient temperature, the entire probe head and preferably plenty of cable must be inside the measured environment. This prevents measurement inaccuracy caused by heat conduction along the cable.

• Probe mounting options are model-speciﬁc.

Figure 2 Example installation

Mount the probe head horizontally to prevent any water condensing on the probe head

from running to the sensors.

2 Let the cable hang loosely to prevent condensed water from running along the cable to

the probe body or probe head.

3 Attach the probe body to a wall or other surface using supplied probe holder (item code

ASM213582).

4 Cable to Modbus master or Indigo transmitter.

More information

‣

Default communication settings (page 99)

4.1 Probe holder ASM213582

52 [2.05]

Ø 5.9 [0.23]

4 mm hex

57 [2.24]

38 [1.50]

mm [in]

25 mm

1 Wall plugs (2 pcs included, 6×30 nylon) 2 Base of the probe holder 3 Screws (2 pcs included, 4.8×25 DIN7981C PZ A4) 4 Ø 25 mm (0.98 in) probe body 5 Top of the probe holder with 2 hex screws (4-mm socket)

Chapter 4 – Installation

Figure 3 Probe holder ASM213582 dimensions

4.1.1 Mounting the probe body using probe holder ASM213582

Probe holder ASM213582 is designed for attaching a 25 mm probe body to a wall or other surface with screws.

534

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

1. Use a 4-mm Allen key to open the hex screws and remove the top part of the probe holder.

2. Hold the base part against the mounting surface and mark the locations of the 2 screw holes.

3. Drill holes at the marked locations using a 6-mm drill bit. Make the holes at least 30 mm deep.

4. Insert the wall plugs in the holes.

5. Mount the base part using screws.

6. Insert the probe body in the holder.

7. Place the top part on the base and tighten the hex screws with a 4-mm Allen key.

4.2 Wiring

Figure 4 M12 5-pin A-coded male connector pinout

Pin #

1 Power supply Operating voltage:

2 RS-485 - White

3 Power GND and

4 RS-485 + Black

5 Not connected Gray

Function Notes Wire colors in Vaisala cables

Brown

• HMP7: 18 ... 30 V DC

• Other models: 15 ... 30 V DC

Current consumption: 10 mA typical, 500 mA max.

Blue

RS-485 common

RS-485 host

DC power supply

RS-485 +

RS-485 -

RS-485 common

Pin #1

Power supply

Pin #2

RS-485 -

Pin #3

Power GND

RS-485 common

Pin #4

RS-485 +

Pin #5

Probe

Figure 5 RS-485 wiring

112 [4.41]

162 [6.38]

Ø 25

[0.98]

M12/5

Ø 5

[0.20]

[0.63]

50 [1.97]

mm [in]

Recommended maximum length of the RS-485 line is 30 m (98 ft).

4.3 HMP1 probe

Chapter 4 – Installation

Figure 6 HMP1 probe dimensions

Vaisala HUMICAPâ Humidity and Temperature Probe HMP1 is designed for ambient measurement in indoor spaces. Its probe head and body are integrated into a single unit with no cable between them. HMP1 can be directly connected to Indigo200 series transmitters to form a single wall-mounted unit.

136 [5.35]

Probe cable 2 m [6.56 ft]

Ø 25

[0.98]

M12/5

98.5 [3.88]

78.5 [3.09]

37.5 [1.48]

Ø 5

[0.2]

Ø 12

[0.47]

M9x1

mm [in]

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

See Attaching probe to Indigo200 series transmitter (page 47).

• Operating temperature −40 … +60 °C (−40 … +140 °F)

• Integrated ﬁlter (non-replaceable)

Do not damage the probe head by bending, crushing, or striking it.CAUTION!

4.4 HMP3 probe

Figure 7 HMP3 probe dimensions

Vaisala HUMICAPâ Humidity and Temperature Probe HMP3 is a general purpose probe designed for various industrial processes. The probe structure allows for replacing the sensor without tools, making it suitable for applications such as paint booths and other industrial applications where periodic recalibration alone is not sucient for maintaining the probe performance. Other suitable applications include, for example, industrial HVAC systems, cleanrooms, and environmental chambers.

• Operating temperature for probe head −40 … +120 °C (−40 … +248 °F)

• Operating temperature for probe body −40 … +80 °C (−40 … +176 °F)

136 [5.35]

Probe cable 2 m [6.56 ft]

Ø 25

[0.98]

M12/5

183 [7.20]

120 [4.72]

41 [1.61]

Ø 5

[0.2]

Fitting body NPT1/2” or M22×1.5 with sealing ring Ø22×27×1.5 Cu

Ø 12

[0.47]

32 mm 27 mm

mm [in]

Chapter 4 – Installation

If purchased with a composite sensor instead of the ﬁeld replaceable HUMICAPâ R2 sensor, HMP3 can use the chemical purge feature. In environments with high concentrations of chemicals and cleaning agents, the chemical purge option helps to maintain measurement accuracy between calibration intervals.

More information

‣

Mounting probe head inside DTR502B (page 38)

4.5 HMP4 probe

Figure 8 HMP4 probe dimensions

Vaisala HUMICAPâ Humidity and Temperature Probe HMP4 is designed for high-pressure applications such as compressed air systems in maritime, breathing air, and industrial applications, where measurement performance and chemical tolerance are essential.

• Temperature measurement range −70 … +180 °C (−94 … +356 °F)

• Operating pressure 0 … 10 MPa (0 … 100 bar)

• Operating temperature for probe body −40 … +80 °C (−40 … +176 °F)

• M22×1.5 or NPT1/2” ﬁtting body

Use a sealing ring (Ø22×27×1.5 Cu) with the M22×1.5 ﬁtting. Replace the sealing ring every time the probe is detached. Three sealing rings are supplied with the

ﬁtting.

136 [5.35]

Ø 25

[0.98]

M12/5

41 [1.61]

253 [9.96]

243 [9.57]

Ø 12

[0.47]

Ø 13.5

[0.53]

Probe cable 2 m [6.56 ft] or 10 m [32.8 ft]

Ø 5

[0.2]

[in]

75 [2.95]

50 [1.96] 19 [0.75]

mm [in]

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

4.6 HMP5 probe

Figure 9 HMP5 probe dimensions

Figure 10 Optional mounting ﬂange 210696 dimensions

Vaisala HUMICAPâ Humidity and Temperature Probe HMP5 is designed for high-temperature applications such as baking ovens, pasta dryers, and industrial drying kilns, where measurement performance and chemical tolerance are essential.

• Temperature measurement range −70 … +180 °C (−94 … +356 °F)

• Operating temperature of probe body −40 … +80 °C (−40 … +176 °F)

136 [5.35]

Ø 25

[0.98]

M12/5

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]

Probe cable 2 m [6.56 ft] or 10 m [32.8 ft]

mm [in]

• 250-mm (9.84 in) probe allows easy process installation through insulation

4.7 HMP7 probe

Chapter 4 – Installation

Figure 11 HMP7 probe dimensions

Vaisala HUMICAPâ Humidity and Temperature Probe HMP7 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 of probe body −40 … +80 °C (−40 … +176 °F)

• Condensation prevention with probe heating

• Vapor and pressure proof construction

Condensation prevention with probe heating

Condensation prevention on HMP7 uses a combination of probe heating and sensor warming. Probe heating keeps the entire probe head above the current dew point temperature, which prevents condensation from forming on the probe.

HMP Series with MMP8 and TMP1 User Guide M212022EN-F

The values of output parameters that are dependent on temperature measurement (such as relative humidity) are unavailable when the probe is warming itself, unless the true temperature of the measured environment is updated to the temperature compensation register of the probe from another measurement instrument (for example, TMP1 model probe). 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.

Indigo500 transmitters support HMP7 temperature compensation from TMP1. For more information, see Indigo520 User Guide (M212287EN).

HMP7 in fuel cell applications

Probe heating makes HMP7 ideal for use in fuel cell applications, speciﬁcally proton-exchange membrane fuel cells (PEMFC). Humidity measurements in fuel cell applications are performed in a high-humidity environment, typically over 80% relative humidity. Performing humidity measurements in hot, near-condensing environments is a challenging task, and the humidity sensor must be adequately protected against saturation to allow continuous measurement. Probe heating accomplishes just that.

HMP7 can be ordered from Vaisala with special settings that have been optimized for the fuel cell application. These settings include a faster probe heating control that allows the probe to quickly heat the probe to stay ahead of the rising dew point temperature.

WARNING!

potentially explosive atmospheres. Make sure no part of the probe is placed in a potentially explosive gas mixture.

More information

‣

Mounting probe head inside DTR502B (page 38)

HMP7 is not designed for use in hazardous environments with

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