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

[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
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

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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

2

		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

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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
		temperature.....................................................................................................	64
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
		temperature.....................................................................................................	68
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
		temperature.......................................................................................................	71
Figure 40		HMP4 temperature measurement accuracy over full range................	71
Figure 41		HMP4 probe dimensions...............................................................................	73

4

		List of figures
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

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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

6

List of tables

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 0203hex...................................................................	108
Table 80	Modbus test registers (read-only)..............................................................	108
Table 81	Device identification objects.......................................................................	108
Table 82	Modbus exception responses......................................................................	109

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HMP Series with MMP8 and TMP1 User Guide

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8

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)

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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! 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.

CAUTION! Caution warns you of a potential hazard. If you do not read and follow instructions carefully at this point, the product could be damaged or important data could be lost.

10

Chapter 1 – About this document

Note highlights important information on using the product.

Tip gives information for using the product more efficiently.

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.

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HMP Series with MMP8 and TMP1 User Guide

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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
	1	Figure 1 Probe parts
		1	Protection cap (remove before use)
	2	2	5-pin M12 connector
		3	Probe body with type label
		4	Status indicator LED:
	6		Green	Power on and probe online,
	3			flashes when communicating
			Red	Error
			Off	Power off, or indicator
				disabled
	7	5	Probe cable. HMP1 model does not
			have a probe cable, as its probe head
	4		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
	8		removable filter over the sensors but
	5		HMP1, HMP9, and TMP1 do not.
		8	Protection cap (remove before use)

To prevent the warming of the indicator LED from causing a slight measurement error, HMP1 keeps the indicator normally off (even when power is on). If the probe is in error state, the red LED is shown.

2.2 Basic features and options

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

12

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 0334hex from an external source makes the output value available during

condensation prevention.

Output parameter is not available on this model.

Table 3 Availability of output parameters

	Output parameter	Output unit	HMP1, 3, 4, 5,	MMP8	TMP1
			7, 8, and 9
	Absolute humidity	g/m3
	Absolute humidity at NTP	g/m3
	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 difference	°C
	Enthalpy	kJ/kg
	Mixing ratio	g/kg
	Relative humidity	%RH
	Relative humidity (dew/frost)	%RH
	Relative saturation	%RS

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HMP Series with MMP8 and TMP1 User Guide				M212022EN-F
Output parameter	Output unit	HMP1, 3, 4, 5,	MMP8		TMP1
		7, 8, and 9
Temperature	°C
Water activity	-
Water concentration	ppmv
Water concentration in oil	ppmv
Water concentration (wet basis)	vol-%
Water mass fraction	ppmw
Wet-bulb temperature	°C
Water vapor pressure	hPa
Water vapor saturation pressure	hPa

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

802.11b/g/n WLAN)

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

14

Chapter 2 – Product overview

2.5 Safety

WARNING! When returning a product for calibration or repair, make sure it has not been exposed to dangerous contamination, and is safe to handle without special precautions.

CAUTION! Do not attempt to open the probe body. There are no user serviceable parts inside the probe body.

CAUTION! Do not touch the probe head with your bare hands. Touching will deposit impurities on the probe head.

CAUTION! Be aware that the probe head may become hot to touch when condensation prevention heating or chemical purge functions are active.

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 off 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.

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HMP Series with MMP8 and TMP1 User Guide

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•Increase the separation between the equipment and receiver.

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

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

CAUTION! Changes or modifications to this equipment not expressly approved 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.

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.

16

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 different 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).

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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 off. 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 0334hex from an external source. 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.

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.

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.

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Chapter 3 – Functional description

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)

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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 differs 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.

4

1

3

2

Figure 2 Example installation

1Mount the probe head horizontally to prevent any water condensing on the probe head from running to the sensors.

2Let the cable hang loosely to prevent condensed water from running along the cable to the probe body or probe head.

3Attach the probe body to a wall or other surface using supplied probe holder (item code ASM213582).

4Cable to Modbus master or Indigo transmitter.

More information

Default communication settings (page 99)

20

Chapter 4 – Installation

4.1 Probe holder ASM213582

1

2

3

4

5

1Wall plugs (2 pcs included, 6×30 nylon)

2Base of the probe holder

3Screws (2 pcs included, 4.8×25 DIN7981C PZ A4)

4Ø 25 mm (0.98 in) probe body

5Top of the probe holder with 2 hex screws (4-mm socket)

52 [2.05]

4 mm hex Ø 5.9 [0.23]

38 [1.50]

25 mm

<![if ! IE]>

<![endif]>57 [2.24]

mm [in]

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.

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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

4	3
	5
1	2

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

	Pin #	Function	Notes	Wire colors in Vaisala cables
	1	Power supply	Operating voltage:	Brown
			• HMP7: 18 ... 30 V DC
			• Other models: 15 ... 30 V DC
			Current consumption: 10 mA typical,
			500 mA max.
	2	RS-485 -		White
	3	Power GND and		Blue
		RS-485 common
	4	RS-485 +		Black
	5	Not connected		Gray

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Chapter 4 – Installation

Probe	RS-485 host
Pin #4	RS-485 +
RS-485 +
Pin #2	RS-485 -
RS-485 -
	RS-485 common
Pin #5
	DC power supply
Pin #1	+
Power supply
Pin #3	-
Power GND
RS-485 common
Figure 5 RS-485 wiring

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

4.3 HMP1 probe

162 [6.38]

112 [4.41] 50 [1.97]

	<![if ! IE]> <![endif]>[0.98]	<![if ! IE]> <![endif]>[0.20]
M12/5	<![if ! IE]> <![endif]>25	<![if ! IE]> <![endif]>Ø5
	<![if ! IE]> <![endif]>Ø

Figure 6 HMP1 probe dimensions

16

[0.63]

mm [in]

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.

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

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

•Integrated filter (non-replaceable)

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

4.4 HMP3 probe

136 [5.35]

M12/5	<![if ! IE]> <![endif]>Ø 25	<![if ! IE]> <![endif]>[0.98]

<![if ! IE]> <![endif]>Ø 5 [0.2]

<![if ! IE]> <![endif]>M9x1

Figure 7 HMP3 probe dimensions

mm [in]

Probe cable 2 m [6.56 ft]

98.5[3.88]

78.5[3.09]

37.5 [1.48]

<![if ! IE]>

<![endif]>Ø 12 [0.47]

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 sufficient 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)

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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

136 [5.35]
									mm
									[in]

M12/5

<![if ! IE]>

<![endif]>Ø 25 [0.98]

Probe cable 2 m [6.56 ft]

183 [7.20]

120 [4.72]

<![if ! IE]>

<![endif]>Ø 12 [0.47]

41 [1.61]

<![if ! IE]>

<![endif]>Ø 5 [0.2]

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

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.

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HMP Series with MMP8 and TMP1 User Guide M212022EN-F

4.6 HMP5 probe

136 [5.35]
									mm
									[in]

M12/5	<![if ! IE]> <![endif]>Ø 25	<![if ! IE]> <![endif]>[0.98]

<![if ! IE]>

<![endif]>Ø 5 [0.2]

Figure 9 HMP5 probe dimensions

75 [2.95]

50 [1.96]

Probe cable

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

	253 [9.96]
	243 [9.57]
	41 [1.61]
<![if ! IE]> <![endif]>Ø 13.5 [0.53]	<![if ! IE]> <![endif]>Ø 12 [0.47]

19 [0.75]

mm [in]

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)

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Chapter 4 – Installation

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

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

4.7 HMP7 probe

136 [5.35]

M12/5	<![if ! IE]> <![endif]>Ø 25	<![if ! IE]> <![endif]>[0.98]

<![if ! IE]>

<![endif]>Ø 5 [0.2]

Figure 11 HMP7 probe dimensions

mm [in]

Probe cable

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

99.5[3.92]

79.5[3.13]

37.5 [1.48]

<![if ! IE]> <![endif]>12Ø [0.47]							<![if ! IE]> <![endif]>[0.47]
		Groove for
					<![if ! IE]> <![endif]>12Ø
		lock ring

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.

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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! HMP7 is not designed for use in hazardous environments with 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)

28