Vaisala HUMICAP HM70 User manual

M210297EN-G
User Guide
Vaisala HUMICAPâHandheld Humidity and
Temperature Meter
HM70

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 2020
No part of this document may be
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displayed in any form or by any means,
electronic or mechanical (including
photocopying), nor may its contents be
modified, translated, adapted, sold or
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written permission of the copyright holder.
Translated documents and translated
portions of multilingual documents are
based on the original English versions. In
ambiguous cases, the English versions are
applicable, not the translations.
The contents of this document are subject
to change without prior notice.
Local rules and regulations may vary and
they shall take precedence over the
information contained in this document.
Vaisala makes no representations on this
document’s compliance with the local
rules and regulations applicable at any
given time, and hereby disclaims any and
all responsibilities related thereto.
This document does not create any legally
binding obligations for Vaisala towards
customers or end users. All legally binding
obligations and agreements are included
exclusively in the applicable supply
contract or the General Conditions of Sale
and General Conditions of Service of
Vaisala.
This product contains software developed
by Vaisala or third parties. Use of the
software is governed by license terms and
conditions included in the applicable
supply contract or, in the absence of
separate license terms and conditions, by
the General License Conditions of Vaisala
Group.

Table of contents
1. About this document.....................................................................................7
1.1 Version information.......................................................................................... 7
1.2 Related manuals................................................................................................7
1.3 Documentation conventions........................................................................... 8
1.4 Trademarks........................................................................................................ 9
2. Product overview.......................................................................................... 10
2.1 Introduction to HM70..................................................................................... 10
2.1.1 Basic features and options.......................................................................11
2.1.2 Overview of probes...................................................................................11
3. MI70 indicator................................................................................................. 13
3.1 MI70 indicator parts........................................................................................ 13
3.2 Installing and recharging MI70 batteries......................................................13
3.2.1 MI70 battery status information............................................................ 14
3.3 MI70 first start-up settings.............................................................................15
3.4 Changing the rechargeable battery pack.....................................................15
4. Taking measurements.................................................................................. 17
4.1 Basic measuring steps.................................................................................... 17
4.2 Errors caused by temperature dierences................................................... 17
4.3 Measuring multiple parameters simultaneously..........................................18
5. Displays and menus ....................................................................................20
5.1 Basic display................................................................................................... 20
5.2 Graphical display............................................................................................. 21
5.3 Main menu........................................................................................................ 21
5.4 MI70 status icons............................................................................................ 22
6. Settings.............................................................................................................24
6.1 Setting actual pressure value and unit........................................................ 24
6.2 Display settings...............................................................................................25
6.2.1 Selecting parameters and units.............................................................25
6.2.2 Rounding.................................................................................................. 25
6.2.3 Holding and saving the display............................................................. 26
6.3 User interface settings................................................................................... 27
6.3.1 Selecting language..................................................................................27
6.3.2 Correcting language selection...............................................................27
6.3.3 Configuring automatic power o..........................................................28
6.3.4 Programming shortcut keys...................................................................28
6.3.5 Configuring button tones and backlight.............................................. 29
6.4 Date and time..................................................................................................29
6.5 Setting calibration reminder.........................................................................30
6.6 Device information.........................................................................................30
6.7 Factory settings............................................................................................... 31
Table of contents
1

6.8 Recording and viewing data......................................................................... 32
6.8.1 Recording data........................................................................................ 32
6.8.2 Viewing recorded data........................................................................... 32
6.8.3 Checking MI70 memory status..............................................................32
6.8.4 Clearing data memory............................................................................33
6.8.5 Transferring recorded data to PC with MI70 Link............................... 33
6.9 Other functions...............................................................................................34
6.9.1 Setting an alarm......................................................................................34
6.9.2 Selecting and scaling analog output.................................................... 35
6.9.3 Chemical purge (optional).....................................................................36
6.9.4 Sensor preheat (optional)......................................................................36
7. Calibrating and adjusting transmitters ...............................................39
7.1 HM70 in checking and adjusting.................................................................. 39
7.1.1 Calibration cables....................................................................................39
7.2 Calibrating and adjusting HMT120 and HMT130 series transmitters........39
7.2.1 Field checking and adjustment of HMT120/HMT130
using a calibrated reference probe........................................................ 41
7.2.2 1-point adjustment of HMT120/HMT130 using a calibrator.................41
7.2.3 2-point adjustment of HMT120/HMT130 using a calibrator............... 42
7.2.4 LiCl-NaCl adjustment of HMT120/HMT130...........................................43
7.3 Calibrating and adjusting HMT330 series and PTU300 series
transmitters.....................................................................................................43
7.3.1 Field checking and adjustment of HMT330/PTU300
using a calibrated reference probe....................................................... 45
7.3.2 1-point adjustment of HMT330/PTU300 using a calibrator.............. 45
7.3.3 2-point adjustment of HMT330/PTU300 using a calibrator..............46
7.3.4 LiCl-NaCl adjustment of HMT330/PTU300......................................... 47
7.4 Calibrating and adjusting HMT310 series transmitters..............................48
7.4.1 Field checking and adjustment of HMT310 using a
calibrated reference probe.................................................................... 49
7.4.2 1-point adjustment of HMT310 using a calibrator............................... 49
7.4.3 2-point adjustment of HMT310 using a calibrator.............................. 50
7.4.4 Environment settings for HMT310..........................................................51
7.5 Checking and adjusting HMP155 probes...................................................... 51
8. Calibrating and adjusting HMP70 series probes ............................ 53
8.1 Probe calibration overview............................................................................53
8.2 LiCl-NaCl automatic RH adjustment of HMP70 series probes.................. 53
8.3 2-point RH adjustment of HMP70 series probes........................................ 53
8.4 1-point RH adjustment of HMP70 series probes.........................................55
8.5 Making temperature adjustments................................................................ 55
8.6 1-point T adjustment of HMP70 series probes............................................56
8.7 2-point T adjustment of HMP70 series probes........................................... 56
9. Maintenance....................................................................................................58
9.1 Changing the filter..........................................................................................58
9.2 Error messages............................................................................................... 58
HM70 User Guide M210297EN-G
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10. Technical data................................................................................................60
10.1 HMP75, HMP76, and HMP77 specifications................................................ 60
10.2 MI70 specifications.........................................................................................63
10.3 Dimensions......................................................................................................65
10.4 Spare parts and accessories......................................................................... 66
Maintenance and calibration services........................................................ 69
Technical support............................................................................................69
Warranty............................................................................................................69
Recycling........................................................................................................... 69
Table of contents
3

List of figures
Figure 1 HMP75, HMP76, and HMP77 probes (left to right).................................. 11
Figure 2 MI70 indicator parts........................................................................................ 13
Figure 3 Measurement error at 100 %RH with 1 °C dierence
between the ambient and sensor temperature.......................................18
Figure 4 Display example with carbon dioxide and temperature
and humidity probes connected simultaneously....................................19
Figure 5 HM70 basic display........................................................................................ 20
Figure 6 HM70 menus.....................................................................................................22
Figure 7 Environment menu......................................................................................... 24
Figure 8 Display setting menus....................................................................................25
Figure 9 User interface settings menus..................................................................... 27
Figure 10 Hold/Save replaced by Chemical Purge shortcut..................................29
Figure 11 Calibration reminder menu.......................................................................... 30
Figure 12 Device information menu............................................................................. 30
Figure 13 HM70 device information screens............................................................... 31
Figure 14 Recording/Viewing menu.............................................................................32
Figure 15 Selecting analog output................................................................................35
Figure 16 Response time to high RH/T environment...............................................37
Figure 17 HMT310 adjustment button location.........................................................48
Figure 18 Temperature measurement accuracy over temperature range.......... 61
Figure 19 Accuracy of dew point temperature °C..................................................... 61
Figure 20 Accuracy of mixing ratio g/kg (ambient pressure 1013 mbar)........... 62
Figure 21 Accuracy of wet bulb temperature °C.......................................................62
Figure 22 Accuracy of absolute humidity g/m3.........................................................62
Figure 23 MI70 indicator and HMP75 probe dimensions in mm (inches).......... 65
Figure 24 HMP76 and HMP77 probe with cable, dimensions in mm (inches).. 66
Figure 25 HMP77 probe dimensions in mm (inches)............................................... 66
HM70 User Guide M210297EN-G
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List of tables
Table 1 Document versions (English)............................................................................ 7
Table 2 Related manuals................................................................................................... 7
Table 3 Display parameters............................................................................................ 10
Table 4 HMP75, HMP76, and HMP77 probe features................................................12
Table 5 MI70 battery status indicator.......................................................................... 14
Table 6 MI70 status icons................................................................................................23
Table 7 List of HM70 error messages..........................................................................58
Table 8 HMP75, HMP76, and HMP77 measurement performance......................60
Table 9 Calculated parameters...................................................................................... 61
Table 10 HMP75, HMP76, and HMP77 general specifications.................................63
Table 11 HMP75, HMP76, and HMP77 mechanical specifications..........................63
Table 12 MI70 measurement indicator..........................................................................63
Table 13 MI70 battery operation time...........................................................................65
Table 14 HM70 spare parts and accessories................................................................67
List of tables
5

HM70 User Guide M210297EN-G
6

1. About this document
1.1 Version information
This manual provides information for operating and maintaining Vaisala HUMICAPâHandheld
Humidity and Temperature Meter HM70.
Table 1 Document versions (English)
Document code Date Description
M210297EN-G October 2020 This document.
• The following sections added:
•Setting calibration reminder (page 30)
•Calibrating and adjusting HMT120 and HMT130 series
transmitters (page 39)
•Calibrating and adjusting HMT310 series transmitters
(page 48)
•Checking and adjusting HMP155 probes (page 51)
• The following sections updated:
• Sections introducing the MI70 indicator
•Measuring multiple parameters simultaneously
(page 18)
•HM70 in checking and adjusting (page 39)
•Calibrating and adjusting HMT330 series and PTU300
series transmitters (page 43)
•2-point RH adjustment of HMP70 series probes
(page 53) (the first note)
•Spare parts and accessories (page 66)
• Removed calibration instructions for HMD20/30,
HMW20/30, HMD60/70, HMW60/70, DMW19, HMM210,
HMP130, HMP230/240 and HMT320
• Document format and layout update, quality
improvements, and content reorganization
M210297EN-F October 2007 Previous version. USB connectivity option added, new
display languages (Chinese, Japanese, Russian) added.
M210297EN-E May 2007 Sensor types updated to HUMICAPâ180R and
HUMICAPâ180RC.
1.2 Related manuals
Table 2 Related manuals
Document code Name
M211060EN Vaisala Humidity and Temperature Probes HMP60 and HMP110 Series User Guide
Chapter 1 – About this document
7

Document code Name
M211726EN Vaisala Humidity and Temperature Transmitter HMDW110 Series User Guide
M211399EN Vaisala Humidity and Temperature Transmitter HMW90 Series User Guide
M212016EN Vaisala HMD60 Series Humidity and Temperature Transmitters HMD62 and
TMD62 User Guide
M212243EN Vaisala HMD60 Series Humidity and Temperature Transmitters HMD65
User Guide
M211659EN Vaisala Humidity and Temperature Transmitter GMW90 Series User Guide
1.3 Documentation conventions
Warning alerts you to a serious hazard. If you do not read and
follow instructions carefully at this point, there is a risk of injury or even death.
WARNING!
Caution warns you of a potential hazard. If you do not read and
follow instructions carefully at this point, the product could be damaged or
important data could be lost.
CAUTION!
Note highlights important information on using the product.
Tip gives information for using the product more eciently.
Lists tools needed to perform the task.
Indicates that you need to take some notes during the task.
HM70 User Guide M210297EN-G
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1.4 Trademarks
Vaisalaâand HUMICAPâare registered trademarks of Vaisala Oyj.
Microsoftâ, Windowsâ, and Excelâare either registered trademarks or trademarks of
Microsoft Corporation in the United States and/or other countries.
All other product or company names that may be mentioned in this publication are trade
names, trademarks, or registered trademarks of their respective owners.
Chapter 1 – About this document
9

2. Product overview
2.1 Introduction to HM70
Vaisala HUMICAPâHandheld Humidity and Temperature Meter HM70 measures relative
humidity and temperature accurately in measurement range −70 … +180 °C (−94 … +356 °F),
depending on the probe model. HM70 incorporates the advanced Vaisala HUMICAPâ
technology that enables reliable and high-performance humidity measurement. HM70 consists
of 2 main units: Vaisala Handheld Measurement Indicator MI70 and the HMP75/HMP76/HMP77
probe.
HM70 can be used to measure the following parameters:
Table 3 Display parameters
Parameter Abbreviation Metric unit Non-metric unit
Relative humidity RH %RH %RH
Temperature T °C °F
Dew point/frost point temperature 1) Td/f °C °F
Dew point temperature 2) Td°C °F
Absolute humidity a g/m3gr/ft3
Mixing ratio x g/kg gr/lb
Wet bulb temperature Tw°C °F
Humid air volume/dry air volume H2O ppm ppm
Water vapor pressure pw hPa lb/in2
Saturation water vapor pressure pws hPa lb/in2
Enthalpy h kJ/kg Btu/lb
Water activity awaw aw
1) Td/f shows dew point temperature above the freezing point (0 °C/32 °F) and frost point
temperature Tf(dew point over ice) below the freezing point.
2) Tdshows dew point over water throughout the entire measurement range.
More information
‣Overview of probes (page 11)
‣MI70 indicator parts (page 13)
‣HMP75, HMP76, and HMP77 specifications (page 60)
‣MI70 specifications (page 63)
HM70 User Guide M210297EN-G
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2.1.1 Basic features and options
HM70 has the following basic features and options:
• Displays various humidity parameters
• Numerical and graphical multilingual displays
• Data recording possibility
• Three probes, temperature measurement range −70 … +180 °C (−94 … +356 °F),
depending on probe model
• Sensor preheat and chemical purge options for demanding conditions
• Multiprobe operation; any combination of 2 Vaisala DM70, GM70, HM70, and MM70 series
probes can be used, for example, for simultaneous humidity and CO2measurements
• The optional, ready-to-use MI70 Link Microsoft Windowsâsoftware, which allows an easy
way to handle measurement data using a serial line or a USB instrument cable
• Delivered with a factory calibration certificate
2.1.2 Overview of probes
Figure 1 HMP75, HMP76, and HMP77 probes (left to right)
1Probe filter
2Calibration mode activation button under the screw in the probe handle
Chapter 2 – Product overview
11

Table 4 HMP75, HMP76, and HMP77 probe features
Probe model Overview
HMP75 Basic probe for relative humidity and temperature measurement. Preheat and
chemical purge options available with model HMP75B.
HMP76 Rugged probe with a long stainless steel shaft. Preheat and chemical purge
options available with model HMP76B.
HMP77 Cable probe for industrial processes up to +180 °C (+356 °F). Preheat and
chemical purge options available with model HMP77B.
HM70 User Guide M210297EN-G
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3. MI70 indicator
3.1 MI70 indicator parts
6
5
4
3
2
1
Figure 2 MI70 indicator parts
1Charger socket
2Function key shortcut buttons . The
functions change according to what
you are doing with the indicator.
3Arrow buttons:
Move up in a menu
Move down in a menu
Enter a sub-menu
Return to previous menu level
4Power On/O button
5Battery compartment at the back of
the indicator
62 ports (labeled I and II) for
connecting probes and instruments.
To open menus, press an arrow button and then press the shortcut buttons. To activate a
function shown above the shortcut button, press the shortcut button. To navigate in the
menus, press the arrow buttons.
3.2 Installing and recharging MI70 batteries
If you are using alkaline batteries, unscrew the back plate of the indicator and insert the
batteries. Do not attempt to recharge standard alkaline batteries.
If you ordered MI70 with a rechargeable battery, it is already in place as shipped from the
factory. The delivered batteries have been pre-charged.
To recharge the battery:
1. Plug in the charger connector to the indicator. The socket is located at the top of the
indicator, covered by a rubber seal.
Chapter 3 – MI70 indicator
13

2. Connect the charger to a wall socket. An animated battery icon in the left corner of the
display indicates that the battery is charging. The recharge duration (typically 4 ... 5 h)
depends on the charge level of the battery.
A new battery takes approximately 3 charging cycles to reach its maximum
battery life.
Do not store the batteries empty. Empty batteries may not charge after an
extended storage period.
More information
‣Changing the rechargeable battery pack (page 15)
3.2.1 MI70 battery status information
The status of the MI70 battery is shown by the battery icon in the upper left corner of the
display. Possible statuses are listed in the following table.
Table 5 MI70 battery status indicator
Battery status indicator
graphic
Description
Battery status icon. The icon can show the following info:
• 0 ... 8 bars, no animation:
• batteries are in use, a charger is not connected
• if a charger is connected: non-rechargeable batteries installed
• if a charger is connected: waiting for the battery temperature to
settle between 0 ... +40 °C (+32 ... +104 °F)
• if a charger is connected and the icon remains at 8/8 bars: the
battery is full
• Animated battery status icon: battery is charging (or recovering
after emptying out completely). The charging animation is shown
also when the indicator is powered o.
• Battery icon not present: batteries are not installed
An empty battery icon with an X over it means that the battery
cannot be recharged and must be replaced. If the indicator is
powered on, a notification about not being able to charge the
battery is shown on the MI70 screen.
You can order replacement batteries from Vaisala (item code 26755).
HM70 User Guide M210297EN-G
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To keep the rechargeable MI70 battery in good working condition, recharge MI70
monthly if the indicator is not in use.
3.3 MI70 first start-up settings
When you switch on MI70 for the first time, configure the basic settings (time, date, language)
as instructed below.
1. Press the Power On/O button.
2. Press any of the arrow buttons and open the menu by pressing Open.
3. Select Settings using the buttons and press .
4. Select User interface and press .
5. Select Language and press Set.
6. Select the language using the buttons. Confirm the selection by pressing Select.
7. If you want to set the date at this point, return to the Settings menu by pressing .
The language can be selected also later. For instructions, see Selecting
language (page 27).
8. To change the date, select Date and press Set. Then change the date using the
buttons. To confirm the selection, press Select. As a default, the date format is year-
month-day. You can select from 2 other alternative formats.
9. To change the time, select Time and press Set. Then change the time by using the
arrow buttons. Confirm the selection by pressing OK. As a default, the time format is
based on the 24-hour clock. If you want to use the 12-hour clock, select 12-hour clock and
then press On.
10. To return to the basic display, press Exit.
3.4 Changing the rechargeable battery pack
• New rechargeable battery pack
• Medium-sized flathead screwdriver
In case you are installing a battery pack and you have a device with alkaline batteries, remove
the metal contact from the probe port end of the battery compartment before installing the
battery pack.
Chapter 3 – MI70 indicator
15

1. Open the back plate of the indicator by opening the screw of the back plate.
2. Remove the old battery pack. Detach the black connector by carefully pulling it up from
the wires.
3. Connect the black connector of the new battery pack. Make sure the position of the
connector is as shown in the following figure (red and black wires are on the upper edge
of the connector). Do not push the connector with conducting material.
4. Place the battery pack in the compartment.
5. Close the back plate and tighten the screw.
6. Recharge the indicator before use.
More information
‣Installing and recharging MI70 batteries (page 13)
HM70 User Guide M210297EN-G
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4. Taking measurements
4.1 Basic measuring steps
Before measurements, ensure that the air pressure setting of HM70 is correct: see
Setting actual pressure value and unit (page 24).
For information on starting to use the MI70 indicator, see MI70 first start-up
settings (page 15).
1. Connect the probe cable to the MI70 indicator's connector port.
2. Switch the MI70 indicator on by pressing the Power On/O button.
3. If your probe includes the chemical purge option (available in HM70 series probe versions
B), remember to carry out chemical purge regularly: see Chemical purge (optional)
(page 36).
4. In case there is a risk of condensation, use the optional preheat (HM70 series probe
versions B) when installing the probe: see Sensor preheat (optional) (page 36).
5. Install the probe to the measuring position.
6. The basic display opens. Let the measurement reading stabilize.
Handle the probe carefully. Strong impact or falling can
damage the probe.
CAUTION!
If you need to disconnect the probe, first press the Power On/O button to
switch the indicator o. This ensures that all settings and data are saved
properly.
4.2 Errors caused by temperature dierences
In humidity measurement and especially in calibration, it is essential that the temperature of
the probe and the measurement environment are the same. Even a small temperature
dierence between the environment and the probe causes an error. As the curve in the
following figure shows, if the temperature is +20 °C and relative humidity is 100 %RH, a
dierence of ±1 °C between the environment and the probe causes an error of ±6 %RH. When
the humidity is 90 %RH, the corresponding error is ±5.4 %RH.
Chapter 4 – Taking measurements
17

A temperature dierence of a few degrees can also cause water to condense on the sensor
surface. The HUMICAPâsensor starts to function normally as soon as the water has
evaporated. If the condensed water is contaminated, the life span of the probe may shorten
and calibration may change.
Figure 3 Measurement error at 100 %RH with 1 °C dierence between the ambient and sensor
temperature
More information
‣Sensor preheat (optional) (page 36)
4.3 Measuring multiple parameters simultaneously
MI70 is a generic indicator that can be used with Vaisala interchangeable dew point
(DM70 series), humidity (HM70 series), carbon dioxide (GM70 series), and moisture in oil
(MM70 series) probes. Two dierent types of probes can be connected to MI70 simultaneously.
1. Switch o the MI70 indicator.
2. Connect the 2 probes to the connector ports (port I and II) on the bottom of the indicator.
3. Switch on MI70.
4. Check that the environment settings of the probes in port I and II are the same if you are
taking measurements from the same condition. In this case, select Yes when MI70
prompts you to check the environment settings.
5. When measuring humidity and CO2simultaneously, you can use the HMP70 probe's
temperature data to compensate the CO2measurement.
a. Select temperature (T) and press Set.
b. MI70 asks if you want to link the measured T value to environment parameter: to link,
press Link and then press Exit.
HM70 User Guide M210297EN-G
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