Vaisala HUMICAP HM70 User Manual

USER'S GUIDE

Vaisala HUMICAP® Hand-Held

Humidity and Temperature Mete

r

HM70

M210297EN-D

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PUBLISHED BY

Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland

Visit our Internet pages at http://www.vaisala.com/

© Vaisala 2006

No part of this manual may be reproduced in any form or by any means, electronic or
mechanical (including photocopying), nor may its contents be communicated to a third
party without prior written permission of the copyright holder.

The contents are subject to change without prior notice.

Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or Conditions of
Sale.

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_________________________________________________________________________________

VAISALA_________________________________________________________________________ 1

Table of Contents

CHAPTER 1

GENERAL INFORMATION ............................................................................ 5

Safety......................................................................................... 5

Recycling .................................................................................. 5

Warranty .................................................................................... 6

CHAPTER 2

PRODUCT DESCRIPTION ............................................................................ 7

Vaisala HUMICAP® Hand-Held Temperature and Humidity

Meter HM70 ...............................................................................

7

Display Parameters .................................................................. 7

CHAPTER 3

PREPARATIONS BEFORE USE ................................................................... 9

Installing and Recharging of Batteries .................................. 9

Turning ON the Device........................................................... 10

CHAPTER 4

TAKING MEASUREMENTS ........................................................................ 11

Beware of Temperature Differences..................................... 12

CHAPTER 5

BUTTONS, DISPLAYS AND MENUS.......................................................... 13

Buttons and Navigation ......................................................... 13

Basic Display .......................................................................... 14

Graphical Display ................................................................... 15

Menus ...................................................................................... 15

CHAPTER 6

SETTINGS .................................................................................................... 17

Pressure Setting..................................................................... 17

Display Settings ..................................................................... 18

Quantities and Units ............................................................ 18

Rounding ............................................................................. 18

Hold/Save Display............................................................... 19

Graphic History.................................................................... 19

User Interface ......................................................................... 20

Selecting Language ............................................................ 20

Automatic Power OFF ......................................................... 21

Changing Shortcut Keys ..................................................... 21

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Button Click and Backlight on Button Press ........................

22

Setting Date and Time......................................................... 22

Device Information .................................................................23

Reverting Factory Settings ..................................................23

CHAPTER 7

RECORDING DATA .....................................................................................25

Recording ................................................................................25

Stopping Recording ...............................................................26

Viewing Recorded Data..........................................................26

Checking Memory Status.......................................................27

Deleting All Recorded Files ...................................................27

MI70 Link Program for Transferring Recorded

Data to PC................................................................................

28

MI70 Link Program for Real-Time PC Monitoring................28

CHAPTER 8

OTHER FUNCTIONS....................................................................................29

Setting Alarm Levels ..............................................................29

Chemical Purge (Optional) ....................................................30

Turning Chemical Purge ON ...............................................30

Sensor Preheat (Optional) .....................................................32

Turning Sensor Preheat ON/OFF........................................33

CHAPTER 9

CALIBRATION AND ADJUSTMENT OF TRANSMITTERS .......................35

HM70 in Checking and Adjusting..........................................35

Calibration Cables ..................................................................35

Calibration and Adjustment of HMD/W 60/70, HMD/W 20/30

and HMP130 Series Transmitters..........................................

36

Calibration and Adjustment of HMT100 Series

Transmitters ............................................................................

37

Field Checking and Adjustment Using a Calibrated

Reference Probe .................................................................

38

One-Point Adjustment Using a Calibrator ...........................39

Two-Point Adjustment Using a Calibrator ...........................39

LiCl-NaCl Adjustment ..........................................................40

Calibration and Adjustment of HMP230/240 Transmitters

and HMM210 Modules ............................................................

41

Field Checking and Adjustment of Humidity by Using a

Calibrated Reference Probe ................................................

43

1-Point Humidity Adjustment by Using a Calibrator ............43

2-Point Adjustment by Using a Calibrator ...........................44

Calibration and Adjustment of HMT320 Series

Transmitters ............................................................................

45

Field Checking and Adjustment by Using a Calibrated

Reference Probe .................................................................

46

1-Point Adjustment by Using a Calibrator ...........................46

2-Point Adjustment by Using a Calibrator ...........................47

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VAISALA_________________________________________________________________________ 3

Calibration and Adjustment of HMT330 Series

Transmitters............................................................................

48

Field Checking and Adjustment by Using a Calibrated

Reference Probe .................................................................

49

1-Point Adjustment by Using a Calibrator ........................... 49

2-Point Adjustment by Using a Calibrator ........................... 50

LiCl-NaCl Adjustment .......................................................... 51

Field Checking of DMW19 Transmitter ................................ 52

CHAPTER 10

MEASURING OTHER PARAMETERS SIMULTANEOUSLY ..................... 53

CHAPTER 11

ANALOG OUTPUT CONNECTION ............................................................. 55

Selecting and Scaling the Analog Output ........................... 55

CHAPTER 12

CALIBRATION AND ADJUSTMENT OF HM70 SERIES PROBES ........... 57

General Information about Calibrations .............................. 57

Relative Humidity Adjustment .............................................. 58

LiCl-NaCl Automatic Adjustment......................................... 58

2-Point Adjustment .............................................................. 58

1-Point Adjustment .............................................................. 59

Temperature Adjustment....................................................... 60

1-Point Adjustment .............................................................. 60

2-Point Adjustment .............................................................. 61

Last Adjustment Date ............................................................61

CHAPTER 13

ERROR MESSAGES.................................................................................... 63

CHAPTER 14

MAINTENANCE ........................................................................................... 65

Changing the Filter................................................................. 65

Changing the Battery Pack.................................................... 65

Vaisala Service Centers......................................................... 66

CHAPTER 15

TECHNICAL SPECIFICATIONS .................................................................. 67

Probes HMP75, HMP76 and HMP77...................................... 67

Measured Variables ............................................................ 67

Relative Humidity ...........................................................67

Temperature................................................................... 68

Calculated Variables ..............................................................68

Typical Ranges.................................................................... 68

Accuracies of Calculated Variables ............................... 69

Accuracy of Dewpoint Temperature °C ......................... 69

Accuracy of Mixing Ratio g/kg........................................ 69

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Accuracy of Wet Bulb Temperature °C ..........................

70

Accuracy of Absolute Humidity g/m³ ..............................70

General ....................................................................................70

MI70 Indicator..........................................................................71

Indicator General .................................................................71

Battery Pack ...................................................................72

General about Vaisala Hand-Held Humidity and

Temperature Meter HM70 ..............................................

72

Electromagnetic Compatibility ........................................72

Accessories............................................................................. 73

Dimensions in mm (inches)................................................... 74

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Chapter 1 _________________________________________________________ General Information

VAISALA_________________________________________________________________________ 5

CHAPTER 1

GENERAL INFORMATION

Safety

Throughout the manual, important safety considerations are
highlighted as follows:

WARNING

Warning alerts you to a potential hazard. If you do not read and
follow instructions very 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.

NOTE

Note highlights important information on using the product.

Recycling

Recycle all applicable material.

Dispose of batteries and the unit according to statutory regulations.
Do not dispose of with regular household refuse.

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Warranty

Vaisala hereby represents and warrants all Products
manufactured by Vaisala and sold hereunder to be
free from defects in workmanship or material during
a period of twelve (12) months from the date of
delivery save for products for which a special
warranty is given. If any Product proves however to
be defective in workmanship or material within the
period herein provided Vaisala undertakes to the
exclusion of any other remedy to repair or at its own
option replace the defective Product or part thereof
free of charge and otherwise on the same conditions
as for the original Product or part without extension
to original warranty time. Defective parts replaced in
accordance with this clause shall be placed at the
disposal of Vaisala.

Vaisala also warrants the quality of all repair and
service works performed by its employees to
products sold by it. In case the repair or service
works should appear inadequate or faulty and should
this cause malfunction or nonfunction of the product
to which the service was performed Vaisala shall at
its free option either repair or have repaired or
replace the product in question. The working hours
used by employees of Vaisala for such repair or
replacement shall be free of charge to the client.
This service warranty shall be valid for a period of
six (6) months from the date the service measures
were completed.

This warranty is however subject to following
conditions:

a) A substantiated written claim as to any alleged

defects shall have been received by Vaisala
within thirty (30) days after the defect or fault
became known or occurred, and

b) The allegedly defective Product or part shall,

should Vaisala so require, be sent to the works of
Vaisala or to such other place as Vaisala may
indicate in writing, freight and insurance prepaid
and properly packed and labelled, unless Vaisala
agrees to inspect and repair the Product or
replace it on site.

This warranty does not however apply when the
defect has been caused through

a) normal wear and tear or accident;

b) misuse or other unsuitable or unauthorized use of

the Product or negligence or error in storing,
maintaining or in handling the Product or any
equipment thereof;

c) wrong installation or assembly or failure to

service the Product or otherwise follow Vaisala's
service instructions including any repairs or
installation or assembly or service made by
unauthorized personnel not approved by Vaisala
or replacements with parts not manufactured or
supplied by Vaisala;

d) modifications or changes of the Product as well

as any adding to it without Vaisala's prior
authorization;

e) other factors depending on the Customer or a

third party.

Notwithstanding the aforesaid Vaisala's liability
under this clause shall not apply to any defects
arising out of materials, designs or instructions
provided by the Customer.

This warranty is expressly in lieu of and excludes all
other conditions, warranties and liabilities, express
or implied, whether under law, statute or otherwise,
including without limitation any implied warranties
of merchantability or of fitness for a particular
purpose and all other obligations and liabilities of
Vaisala or its representatives with respect to any
defect or deficiency applicable to or resulting
directly or indirectly from the Products supplied
hereunder, which obligations and liabilities are
hereby expressly cancelled and waived. Vaisala's
liability shall under no circumstances exceed the
invoice price of any Product for which a warranty
claim is made, nor shall Vaisala in any
circumstances be liable for lost profits or other
consequential loss whether direct or indirect or for
special damages.

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Chapter 2 _________________________________________________________ Product Description

VAISALA_________________________________________________________________________ 7

CHAPTER 2

PRODUCT DESCRIPTION

Vaisala HUMICAP® Hand-Held Temperature and
Humidity Meter HM70

HM70 consists of two main units: MI70 indicator and
HMP75/HMP76/HMP77 probe. HM70 Hand-held humidity meter

incorporates Vaisala's advanced HUMICAP® technology which
enables reliable and high performance humidity measurement.

Vaisala HM70 is delivered with a factory calibration certificate.

Display Parameters

- RH relative humidity (% RH)

- T temperature (°C/°F)

- T

d/f

: dewpoint/frostpoint

1)

temperature (°C/°F)

- Td : dewpoint temperature

2)

(°C/°F)

- a : absolute humidity (g/m3/ gr/ft3)

- x : mixing ratio (g/kg / gr/lb)

- T

w

: wetbulb temperature (°C/°F)

- H

2

O: humid air volume/ dry air volume (ppm)

- pw: water vapour pressure (hPa/ lb/in2)

- pws: saturation water vapour pressure(hPa/ lb/in2)

- h : enthalpy (kJ/kg / Btu/lb)

- aw : water activity

1)

T

d/f

shows dewpoint temperature above the freezing point (0°C/32

°F) and frostpoint temperature T

f

(dewpoint over ice) below the

freezing point.

2)

Td shows dewpoint over water throughout the entire measurement
range.

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1 MI70 indicator
2 Recharger connector
3 Connector ports for

probes and cables

4 Calibration button under

the screw

5 Probe HMP75/76/77
6 Probe filter

1

2

4

HMP75 PROBE

Basic probe for relative humidity
and temperature measurement
Preheat and chemical purge
options available (HMP75B).

HMP76 PROBE

Rugged probe with a
long stainless steel
shaft. Preheat and
chemical purge options
available (HMP76B).

HMP77 PROBE

Cable probe for industrial
processes up to 180 °C.
Preheat and chemical purge
options available (HMP77B).

Power ON/OFF

5

6

Port I 3

Port II

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Chapter 3 _____________________________________________________ Preparations Before Use

VAISALA_________________________________________________________________________ 9

CHAPTER 3

PREPARATIONS BEFORE USE

Installing and Recharging of Batteries

1. If you are using alkaline batteries, unscrew the back plate of the

indicator and insert the alkalines. If HM70 is ordered with
rechargeable battery pack, it is already in place as shipped from
the factory.

2. Recharge the battery pack as follows: Plug in recharger connector

to the base of the indicator and connect the recharger to wall
socket. A battery symbol in corner of display starts to roll.

- It is not recommended to use HM70 during the first recharging.

Later on HM70 can be used while recharging.

- Duration of recharging depends on the charge level of the battery

pack being 4 hours typical. The recommended first recharging
time is 6 hours.

3. The battery pack is full when the battery symbol stops rolling.

4. Disconnect the recharger.

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Turning ON the Device

1. Connect the probe to the either of the base connectors of the

indicator.

2. Press button.

3. Select the language by using buttons. Confirm by

pressing SELECT. You can select the language later as well, see
page 20.

4. To change the date, select Date and press SET. Change the date

by using any of the buttons. To confirm the date,
press OK. The default date presentation format is: year-month-

date

. If you want to change the format, see page 22.

5. To change the time, select Time and press SET. Change the

time by using arrow buttons. To confirm the time, press OK.
The default time presentation format is 24-hour clock. If you
want to use 12-hour clock, select 12-hour clock, press ON.

6. Press EXIT. To check and change the pressure setting, select

YES. Otherwise select NO, basic display appears.

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Chapter 4 _______________________________________________________ Taking Measurements

VAISALA________________________________________________________________________ 11

CHAPTER 4

TAKING MEASUREMENTS

See Chapter 3 Preparations Before Use if you are starting the HM70
for the first time, otherwise follow instructions below:

1. Connect the probe to MI70-indicator.

2. Press POWER ON/OFF button.

3. If you have a chemical purge option in your probe (HM70 series

probe versions B), remember to carry out chemical purge
regularly, see page 30.

4. In case there is a risk for condensation, use the optional preheat

(HM70 series probe versions B) when installing the probe, see
page 32.

5. Install the probe to the measuring position. If measuring in

pressurized processes, see the instructions on page 17.

6. Before measurements, ensure that the air pressure setting of

HM70 is correct (see page

17).

7. The basic display opens, let the reading stabilize.

CAUTION

If you need to disconnect the probe from the indicator, first press

POWER ON/OFF button to turn the indicator OFF. This ensures that all

settings and data are saved properly.

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Beware of Temperature Differences

In humidity measurement and especially in calibration it is essential
that temperature of the probe and measuring environment is the same.
Even a small difference in temperature between the environment and
the probe causes an error. As the curve below shows, if the
temperature is +20 °C and the relative humidity 100 %RH, a
difference 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.

A temperature difference of a few degrees can also cause water to
condense on the sensor surface. HUMICAP

®

®

sensor 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. See also information about sensor preheat, page 32.

Temperature (°C)

dRH (%RH)

0

1

2

3

4

5

6

7

8

9

10

-40-200 20406080100

Measurement error at 100 %RH when the difference between the
ambient and sensor temperature is 1 °C.

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Chapter 5 __________________________________________________Buttons, Displays and Menus

VAISALA________________________________________________________________________ 13

CHAPTER 5

BUTTONS, DISPLAYS AND MENUS

Buttons and Navigation

Press down the POWER ON/OFF button until the indicator turns on/off.

Press the SHORTCUT buttons to activate the function shown above the button.

Press any of the ARROW buttons to open the MENUS. In the MENUS you can navigate

with ARROW buttons.

Power ON/OFF

Shortcut buttons

Arrow buttons

To open a menu view

1. Press an arrow button

2. Press this shortcut button

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14 ___________________________________________________________________ M210297EN-D

Basic Display

1. Selected quantities. Up to three of the quantities can be selected at

a time.

- RH relative humidity (% RH)

- T temperature (ºC/ ºF)

- T

d/f

: dewpoint/frostpoint1 temperature (ºC/ ºF)

- Td : dewpoint temperature2) (ºC/ ºF)

- a : absolute humidity (g/m3/ gr/ft3)

- x : mixing ratio (g/kg / gr/lb)

- Tw: wetbulb temperature (ºC/ ºF)

- H2O: humid air volume/ dry air volume (ppm)

- pw: water vapour pressure (hPa/ lb/in2)

- pws: saturation water vapour pressure(hPa/ lb/in2)

- h : enthalpy (kJ/kg / Btu/lb)

- aw : water activity

2. Shortcut button Graphic

1

changes display into curve mode

3. Shortcut button Hold/Sa

1

freezes display and you may save the

reading into the memory.

4. Shortcut button Record

1

takes you to the Recording/Viewing menu.

5. State of battery.

6. Pressure setting.

1

Graphic, Hold/Sa and Record -functions above the shortcut buttons are set

in the factory. You can change them to refer other functions (see page

21).

1

2

3

4

5 6

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Chapter 5 __________________________________________________Buttons, Displays and Menus

VAISALA________________________________________________________________________ 15

Graphical Display

Graphical display shows you the measurements in a form of curve.
From the curve you can examine the data trend and history of the last
minutes. Graphical display shows firstly the curve of the uppermost
quantity shown in a basic display.

1. In basic display, press Graphic or (alternatively open the MENU,

select Display, select Graphic history

2. Graphical display opens. More information on page

19 Graphic

history

.

3. Press BACK to return to the basic display.

Menus

In the menus you can change settings and select the functions.

1. Open the main menu by pressing any of the buttons.

2. Press OPEN within 5 seconds. The basic display returns if you

do not open the MENU shortly. If this happens, begin with the item
1 again.

3. Move in the menus by using buttons.

4. Select the item with buttom.

5. Press to return to the earlier level.

6. EXIT returns back to normal operation.

Main menu Display menu

Functions menu

Recording/Viewing menu

Settings menuEnvironment menu

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Chapter 6 ___________________________________________________________________Settings

VAISALA________________________________________________________________________ 17

CHAPTER 6

SETTINGS

Pressure Setting

In pressurized environments, the actual process pressure value shall be
set to HM70. The pressure can be given in the following units:

hPa: Absolute pressure given in the unit of hPa.

barg

:

Gauge pressure given in the unit of bar. Indicates the pressure
difference between normal atmospheric pressure and the actual
process pressure.

bara: Absolute process pressure given in the unit of bar.

psia: Absolute pressure given in the unit of psi.

Follow the instructions below:

1. Open the MENU; press OPEN

2. Select ENVIRONMENT with and press .

3. Press UNIT to change the pressure unit. Default unit is hPa.

4. Press SET to set the ambient pressure value.

5. Set the pressure value by using buttons. Press +/- to

change the sign of the pressure value. Press OK to save the
value.

6. Press EXIT to return to the basic display.

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Display Settings

→

Quantities and Units

All the quantities and units are shown in page 7.

1. Open the

MENU; press OPEN.

2. Select Display, press .

3. Select Quantities and units, press

4. To select a quantity, move on the quantity you want by using the

arrow buttons, press SELECT.

5. To change the unit, move on the quantity you want by using the

arrow buttons, then press UNIT .

6. To hide a quantity, move on the quantity you want to hide by using

the arrow buttons, then press HIDE.

7. Press EXIT to return to the basic display.

8. If asked, press YES, if you want to check environment settings,

otherwise press

NO.

Rounding

You can turn on the decimal display by using the Rounding function.
The default setting is rounding off .

1. Open the

MENU: press OPEN

2. Select the Display, press

3. Select Rounding.

4. Press ON to have rounding on. Press OFF to deactivate

rounding (two decimal display).

5. Press EXIT to return to the basic display.

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Chapter 6 ___________________________________________________________________Settings

VAISALA________________________________________________________________________ 19

Hold/Save Display

Hold/Save function enables you to freeze a certain display reading.
This reading can be saved into the memory.

1. Open MENU: press OPEN.

2. Select Display, press

3. Select Hold/Save display.

4. Press HOLD to freeze the display. The frozen measurement data is

displayed.

5. Press SAVE to save the reading and CANCEL to return to the

menu.

6. You can save several readings with HOLD-SAVE function. The data

points are identified on the basis of the saving date and time. All
the individual readings (data points) are stored in a same file
marked with . The file remains in the indicator memory even if
the indicator is switched OFF.

7. To view the saved readings, press Record, select View recorded

data,

press .

8. Select the file marked with , press . Now you can see the

saved data readings. Press TIMES to see the recording
timestamps.

9. Press EXIT to return to the basic display.

Graphic History

Graphic history shows the data curve of the last hour. To see longer
graphs, use the data recording function to save the data and then view
it as a graph.

1. Open the MENU: press OPEN.

2. Select Display, press

3. Select Graphic history, press SHOW to have a graphical history

display.

4. To get the statistical info on the graph area (minimum, maximum

and mean values), press INFO.

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20 ___________________________________________________________________ M210297EN-D

5. To get the curve of the other selected quantities, press NEXT.

To get the curves of the all quantities, press NEXT until text
ALL is shown instead of NEXT. Then press ALL.

6. To zoom in the curve, press the arrow button . To zoom out,

press the button . To move the curve in horizontal directions,
press the buttons .

7. Press BACK and EXIT to return to the basic display.

User Interface

→ →

Selecting Language

You can select any of the following languages as an user interface
language: English, German, French, Finnish, Spanish or Swedish.

1. Open the MENU: press OPEN.

2. Select

Settings, press .

3. Select User interface, press .

4. Select Language, press SET.

5. Select the language you want, press SELECT.

6. Press

EXIT to return to the basic display.

If you accidentally select a wrong language, first go back to the basic
display by pressing rightmost key as many times as required, then

go to the language selection menu by pressing: , middle key

, , , middle key.

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Chapter 6 ___________________________________________________________________Settings

VAISALA________________________________________________________________________ 21

Automatic Power OFF

As shipped from factory, HM70 has a default setting which turns the
power off automatically after 15 minutes of inactivity. This is to
conserve the battery. In case you want to change the inactivity time
setting to 60 minutes or turn off the automatic power off function,
follow the instructions.

1. Open the MENU: press OPEN.

2. Select Settings, press

3. Select User interface, press .

4. Select Auto power off, press SET.

5. Select the choice you want, press SELECT.

6. Press EXIT to return to the basic display.

Changing Shortcut Keys

As a default, the three shortcut keys refer to the functions Graphic,

Hold/Save and Record. If needed, a shortcut for the functions can be

changed to correspond to your needs.

1. Open the MENU: press OPEN.

2. Select Settings, press .

3. Select User Interface, press .

4. Select Program shortcut keys, press START.

5. Press the shortcut key you want to change, e.g. Hold/Save.

6. If you want to replace Hold/Save with Chemical purge-function

(as an example), select Chemical Purge by using arrow buttons
( Functions) Chemical Purge, press SELECT. Answer YES to confirm
your selection, otherwise answer NO and continue from item 4.

7. Press EXIT to return to the basic display.

Hold/Save -shortcut key replaced
by Chemical purge -shortcut key

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22 ___________________________________________________________________ M210297EN-D

Button Click and Backlight on
Button Press

1. Open the MENU: press OPEN.

2. Select Settings, press .

3. Select User interface, press .

4. To turn OFF or ON sound effect while pressing the buttons,

select Key Click and press ON/OFF.

5. To turn OFF and ON backlight while pressing the buttons, select

Backlight on key press ON/OFF.

6. Press EXIT to return to the basic display.

Setting Date and Time

To have correct date and time in recorded data files, set the date and
time according to the following instructions.

1. Open the MENU: press OPEN.

2. Select Setting, press .

3. Select Date and time, press .

4. To change the date, select Date and press SET. Change the date

by using arrow buttons. To confirm the date, press. OK. The
default date presentation format is year-month-date, e.g.2002-
06-05. If you want to change the format, select Date format: Y-M-D,
press SET , select either D.M.Y or M/D/Y, press SELECT .

5. To change the time, select Time and press SET. Change the

time by using arrow buttons. To confirm the time, press OK.
The default time presentation format is 24-hour clock. If you
want to change the format, select 12-hour clock, press ON/OFF.

6. Press EXIT.

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Chapter 6 ___________________________________________________________________Settings

VAISALA________________________________________________________________________ 23

Device Information

→
The basic information about the indicator and the probe is found as
follows:

1. Open the MENU: press OPEN

2. Select Settings, press .

3. Select Device information, press SHOW.

4. The first display gives the information on the MI70 indicator.

Press MORE to get the information on the probe. Press OK

and EXIT to return to the basic display.

Reverting Factory Settings

Factory settings can be reverted to clear all changed settings and data
memory of the indicator. Reverting factory settings does not effect on
probe calibration.

1. Open the

MENU: press OPEN.

2. Select Settings, press .

3. Select Factory settings, press REVERT. Press YES to confirm the

reverting.

4. The power turns off automatically. When switching on again,

the factory settings are reverted. You shall set the language, date

and time again. See Chapter 3.

Probe type information

MI70 indicator
information

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Chapter 7 _____________________________________________________________Recording Data

VAISALA________________________________________________________________________ 25

CHAPTER 7

RECORDING DATA

Recording

→

You can record measurement data and view the recorded data on the
display.

1. Press the shortcut Record, (alternatively open the MENU, select

Recording/Viewing).

2. Select Record data, press .

3. To change interval, select Interval, press SET.

4. Select the measurement interval with arrow buttons.

Measurement intervals and the maximum recording times are

shown in the table below.

Maximum recording time (memory full) Recording interval

1

quantity

2

quantities

3

quantities

1 s 45 min 22 min 15 min

5 s 3 h 113 min 75 min
15 s 11 h 5 h 3 h
30 s 22 h 11 h 7 h

1 min 45 h 22 h 15 h

5 min 9 days 4 days 3 days
15 min 28 days 14 days 9 days
30 min 56 days 28 days 18 days

1 h 113 days 56 days 37 days
3 h 339 days 169 days 112 days

12 h 1359 days 678 days 451 days

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26 ___________________________________________________________________ M210297EN-D

5. Press SELECT.

6. To set the recording duration, select Duration, press SET.

7. Select the recording duration (1 min, 5 min, 15 min, 30 min, 1 h, 3

h, 12 h, 24 h, 7 d, 30 d, memory full) with arrow buttons and
press SELECT.

8. Start recording: select Start/Stop recording, press START. If you

chose 'Memory full', you see the maximum recording time on
the display. You can also delete files in order to empty the
memory. Press START again to accept maximum recording
time.

9. You can switch the HM70 off during recording to save battery.

Display message tells you that recording continues undisturbed
even when power is off. If the indicator is switched off during
recording, the progress bar is shown on the display every
10 seconds (all the time, if charger is connected). This bar shows
the amount of recorded data.

CAUTION

Do not disconnect the probe when the data recording is on,
even if the indicator is off. This may cause loss of recorded
data.

Stopping Recording

1. To stop recording press Record, select Record data and press ,

select Start/Stop recording and press STOP.

2. Now you can go and see the recorded file by selecting SHOW.

You can save individual measurement data points with

Hold/Save

function described in page

19.

Viewing Recorded Data

1. Open the MENU: press OPEN .

2. Select Recording/Viewing, press .

3. Select View recorded data, press .

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Chapter 7 _____________________________________________________________Recording Data

VAISALA________________________________________________________________________ 27

4. Select the file you want to view, press . The files are

identified according to the starting date and time of recording.

5. Press GRAPH to get the graphical view, press TIMES to get

the recording timestamps (press VALUES to go back the
recorded values).

6. Press EXIT to return to the basic display.

Checking Memory Status

You can check how much there is free space in the memory.

1. Open the MENU: press OPEN .

2. Select Recording/Viewing, press .

3. Select Memory status, press SHOW to see the amount of memory

in use and the estimated free space.

4. To return to the basic display, press OK and EXIT.

Note that the estimate of the free space is calculated for current
number of active quantities. If you change the displayed quantities, the
estimate is different.

Deleting All Recorded Files

The data memory can be cleared as follows:

1. Open the

MENU: press OPEN.

2. Select

Recording/Viewing, press .

3. Select Clear data memory, press CLEAR. Press YES to confirm

deletion of all recorded data files.

4. To return to the basic display, press EXIT.

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28 ___________________________________________________________________ M210297EN-D

MI70 Link Program for Transferring Recorded
Data to PC

The recorded data can be transferred to a PC by using MI70 Link
program.

MI70 Link program can be ordered from Vaisala, see list of
accessories on page 73. You can examine the recorded data easily in

Windows

environment and transfer it further to a spreadsheet program

(such as Microsoft® Excel) to be modified.

MI70 Link Program for Real-Time PC
Monitoring

You can monitor HM70 readings directly with a PC by using MI70
Link program. MI70 Link program can be ordered from Vaisala, see
list of accessories on page 73.

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Chapter 8 ____________________________________________________________ Other Functions

VAISALA________________________________________________________________________ 29

CHAPTER 8

OTHER FUNCTIONS

Setting Alarm Levels

→

HM70 is alarming by beeping and blinking the backlight. The alarm
turns on when the measured value is not between the alarm limits
(permissible area). Alarm level(s) can be set for only one quantity at a
time. Set the alarm levels as follows:

1. Open the MENU: press OPEN.

2. Select Functions, press .

3. Select

Alarm, press .

4. Select Quantity and press SET to choose a quantity.

5. Select quantity, press

SELECT.(Only one quantity can be
chosen at a time. Only active quantities can be selected. To
change the active quantities, go to

MENU- Display- Quantities and

units

).

6. Select the first limit, press SET (if the alarm function is ON,

take it OFF). Set the alarm level by using arrow buttons. Press

+/- button to choose the sign of the alarm level. Press OK to

save the setting.

7. Select the second limit, then follow instructions in item 6. The

alarm will go off when the upper limit is exceeded or when
lower limit is gone below.

If you have only one limit, e.g. if you want to detect if the
humidity is rising above 50 % RH, set the upper limit to 50 %

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30 ___________________________________________________________________ M210297EN-D

RH and the lower limit so low that it never will be reached (for
example 0 % RH). Thus, the HM70 will alert when RH rises
above 50 % RH.

8. Select Alarm ON/OFF, press ON to activate the alarm and return

back to the basic display.

9. A note picture sign

appears on the upper left corner.

10. When the alarm level is reached, you can stop alarming by

pressing

OK. To reactivate the alarm function, answer YES.

To stop the alarm function completely, answer NO.

NOTE

The alarm is not in function when the device is turned off. Remember
to turn off the automatic power off, see page 21.

Chemical Purge (Optional)

Chemical purge is an optional feature of the HM70 series humidity
probes (B-version probes). In some specific applications the sensor
gain may decrease gradually due to an interference caused by some
particular chemical present in the ambient (see figure). The sensor
polymer absorbs the interfering chemical; this reduces the polymer's
ability to absorb water molecules and so decreases the sensor
sensitivity. In chemical purge the interfering chemical is evaporated
by heating the humidity sensor to a temperature of +160 °C for 2
minutes.

For the most applications it will be sufficient to perform chemical
purge once a week. For applications where HM70 is subject to high
concentrations of chemicals, chemical purge should be performed
more frequently, in extreme cases before each measurement.

Turning Chemical Purge ON

The following applies only with humidity probes HMP75B, HMP76B
and HMP77B:

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Chapter 8 ____________________________________________________________ Other Functions

VAISALA________________________________________________________________________ 31

1. Open the MENU: press OPEN.

2. Select Functions, press .

3. Select Chemical Purge, press START.

4. Confirm the starting by pressing YES. Chemical purge takes up to

6 minutes. During that time there are no readings on a display. A
message display appears once in 15 seconds and it tells you the
time required to complete the chemical purge. The chemical
purge symbol is shown on upper left corner.

5. When the chemical purge is done the basic display with readings

returns.

6. Stabilization of temperature reading can take a few minutes.

You can make a shortcut to the chemical purge function by setting one
shortcut key to refer Chemical Purge function, see page 21.

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Sensor Preheat (Optional)

Sensor preheat is an optional feature of the HM70 series humidity
probes (B-version probes).

In some measurement applications, unwanted dew formation makes
humidity measurement difficult or even impossible. High humidity
combined with rapidly changing outdoor temperature can condense
the water vapour in the air onto the sensor head. Until this dew
evaporates or dries, it is impossible to obtain a true reading. In sensor
preheat the sensor is heated to a temperature level of approximately
+100 °C for up to 4 minutes. This is to prevent possible condensate
from the sensor.

When setting the probe from outdoor conditions into warm and humid
conditions there can be large temperature difference between the
probe head and external environment. In such a conditions turn on the
sensor preheat immediately before installing the probe to prevent
condensation forming on the probe.

Figure below shows how response time can be dramatically shortened
and water condensation on the sensor avoided when using sensor
preheat.

Response time to high RH/T enviroment

0

20

40

60

80

100

120

0 1020304050607080

time (s)

%RH

No Preheat Preheat for 12s

This curve shows how
relative humidity
increases as a
consequence of
condensation on the
sensor. The correct
response is achieved
not until the sensor is
dried.

When using preheat,
response time is
shortened.

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Chapter 8 ____________________________________________________________ Other Functions

VAISALA________________________________________________________________________ 33

Turning Sensor Preheat ON/OFF

The following applies only with humidity probes HMP75B, HMP76B
and HMP77B:

1. Open the MENU: press OPEN.

2. Select Functions, press .

3. Select Sensor Preheat, press START. Confirm the starting by

pressing YES.

4. Insert the probe to the process.

5. When sensor preheat is done, a display message tells that

operation is completed and the basic display with readings
returns.

Sensor preheat is taking about 4 minutes at maximum. During
that time there are no readings on a display. A message display
appears once in 15 seconds and it tells you the time required to
complete the sensor preheat. Sensor preheat symbol is
shown on upper left corner. Stabilization of the temperature can
take a few minutes.

You can make a shortcut to the sensor preheat function by
setting one shortcut key to refer sensor preheat function, see
page 21.

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Chapter 9 _______________________________________ Calibration and Adjustment of Transmitters

VAISALA________________________________________________________________________ 35

CHAPTER 9

CALIBRATION AND ADJUSTMENT OF
TRANSMITTERS

HM70 in Checking and Adjusting

The following transmitters can be calibrated by using HM70: HMDW
60/70, HMW 61/71, HMD/W 20/30, HMP130, HMP230/240 series,
HMT320/330 series, HMM210 series and DMW19 transmitter.

− in the field; check and adjust a fixed transmitter's reading against

HM70's calibrated reference probe

− one or two point calibrations can be done to industrial transmitters

and modules (HMP230/240 series, HMT320/330 series, HMM210
modules) by using a MI70 indicator and Vaisala's humidity
calibrator HMK15.

Calibration Cables

For calibration and adjustment connect HM70 to fixed transmitter by
using one of the following connection cables:

- HMA6070-cable for HMD/W 60/70 and HMW 61/71 transmitters

- HMA2030-cable for HMD/W 20/30 and HMP130 transmitters

- 27159ZZ-cable for HMP230/240 series transmitters and HMM210

series modules.

- 211339-cable for HMT320/330 series transmitters

- 211917ZZ-cable for DMW19 transmitter.

Connector ports for connection
cables

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36 ___________________________________________________________________ M210297EN-D

Calibration and Adjustment of HMD/W 60/70,
HMD/W 20/30 and HMP130 Series Transmitters

For checking and adjusting HM60/70 series and HM20/30/130 series
transmitters you need a MI70 and a HMP70 calibrated reference probe
and a connection cable. Only relative humidity channel of these
transmitters can be checked.

1. Connect the end of the HMA6070 (connection cable for

HM60/70-series) or HMA2030 (connection cable for HM20/30-
series) cable to either of the HM70's connector port located on
the bottom of the indicator, see figure on page 35.

2. Connect the other end of the HMA6070 or HM20/30/130-cable

to the RH TEST connector (or TEST connector) of the transmitter's
motherboard.

3. Turn on MI70 indicator.

4. This concerns ONLY calibration of HM60/70-series: If a

transmitter has voltage output, select the RH input scale setting

0... 20 mA. If a transmitter has current output, set the indicator's
default setting to correspond the transmitter's signal (0... 20
mA/4...20 mA) as follows:

− Open the MENU: press OPEN.

− Select Settings, press

− Select Measurement settings, press

− Select RH scale: 4...20 mA or 0...20 mA, press ON

− To return to the basic display, press EXIT

5. Now the reading of the transmitter is shown on the first or

middle row of the display, depending on the connector port to
which the calibration cable is connected. Value of the port I is
shown on the upper row of the display and the value of the
port II on the lower row of the display. Difference of the
readings is shown in the lowest row.

6. Ensure that the probes are located in the same conditions. You

can have an optional probe holder for the HMP76 probe to

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Chapter 9 _______________________________________ Calibration and Adjustment of Transmitters

VAISALA________________________________________________________________________ 37

attach the probe next to the probe of HMD60/70 or HMD20/30
(order code for the probe holder: HM36915).

7. Wait until the readings have stabilized (can take up to 20

minutes). If the difference between the humidity readings is less
than 2 % RH, there is no immediate need for adjustment.

8. Adjust the transmitters reading to correspond the HM70

reference probe by turning the small screw on the modules on
the transmitter's mother board marked with RH offset/ RH gain. If
the RH reading is < 65 %, turn the RH offset screw and if the RH
reading is >65 %, turn the RH gain screw. Turning to the
clockwise direction increases the reading, turning to opposite
direction decreases the reading.

Do not breathe towards the transmitter probes when adjusting
the reading.

9. When the transmitter reading is equal with the HM70 reference

probe's reading, adjustment is done.

10. Switch off HM70 and detach the cable from the transmitter and

the HM70 indicator.

Calibration and Adjustment of HMT100 Series
Transmitters

You can check and adjust the HMT100 relative humidity
measurement with Vaisala HM70 Hand-Held Humidity and
Temperature meter. A HM70-connection cable is needed, Vaisala
order code: 211339.

There are four types of adjustments available: field checking and
adjustment using a calibrated reference probe, one-point adjustment
using a calibrator, two-point adjustment using a calibrator and LiCl-
NaCl adjustment.

Follow the 7 first steps and continue according to the chosen
adjustment method:

1. Connect the 211339 HM70-connection cable to the SERVICE PORT

connector on the HMT100 motherboard (see Figure 10 on page

19).

2. Connect the other end of the connection cable to either of the

HM70's connector ports located on the bottom of the indicator.

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38 ___________________________________________________________________ M210297EN-D

3. Turn on both devices (or just the HM70 if HMT100 is on

continuously).

4. The reading of the transmitter is shown on the top or middle row

of the indicator display, depending on which connector port the
connection cable is connected to.

5. Press the ADJ button on the HMT100 motherboard to open the

adjustment mode. The indicator led on the HMT100
motherboard starts flashing. From now on the adjustment is
carried out using the MI70 indicator.

6. Press OK to start adjustment.

7. Check the environment settings if needed. Otherwise press NO.

Continue according to the directions of the desired adjustment
method.

Field Checking and Adjustment
Using a Calibrated Reference Probe

Follow steps 1 to 7 on page 37 and continue as follows:

8. Check that the probes are located in equal conditions and wait

until the readings have stabilized (may take 30 minutes or
more). If you are near the probes, do not breath in their
direction.

9. Press ADJUST to continue adjusting.

10. Choose

To same as RH

I/II

from the MI70 adjustment menu, press

SELECT (MI70 automatically recognizes which port the HMP70-

series probe is connected to).

11. Confirm the adjustment by pressing YES.

12. The adjustment is done. Press BACK and EXIT to return to the

basic display.

13. Turn off the MI70 and detach the connection cable.

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Chapter 9 _______________________________________ Calibration and Adjustment of Transmitters

VAISALA________________________________________________________________________ 39

One-Point Adjustment Using a
Calibrator

When adjusting the transmitter in only one reference condition, please
take care that the reference condition represents the measuring
environment. MI70 indicator is used now only as a terminal for
visualizing and setting the transmitter's RH reading.

Follow steps 1 to 7 on page 37 and continue as follows:

8. Remove the filter from the transmitter's probe and insert the

probe head into the reference condition.

9. Press ADJUST to continue adjusting.

10. Choose 1-point adjustment from the MI70 adjustment menu, press

SELECT.

11. Press READY when the reading has stabilized in the reference

condition (may take 30 minutes or more). You can follow the
stabilization from the GRAPH display.

12. Enter the correct reference value with the arrow buttons. Press

OK.

13. Confirm the adjustment by pressing YES.

14. The adjustment is done. Press BACK and EXIT to return to the

basic display.

15. Turn off the MI70 and detach the connection cable.

Two-Point Adjustment Using a
Calibrator

Note that the difference between the two reference humidities must be
at least 50 %. MI70 indicator is used now only as a terminal for
visualizing and setting the transmitter's RH reading.

Follow steps 1 to 7 on page 37 and continue as follows:

8. Remove the filter from the transmitter's probe and insert the

probe head into the lower humidity reference condition.

9. Press ADJUST to continue adjusting.

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40 ___________________________________________________________________ M210297EN-D

10. Choose 2-point adjustment from the MI70 adjustment menu,

press SELECT.

11. Press READY when the reading has stabilized in the first reference

condition (may take 30 minutes or more). You can follow the
stabilization from the GRAPH display.

12. Enter the correct reference value in the first condition with the

arrow buttons. Press OK.

13. Remove the probe from the first reference conditions and insert

the probe head into the higher humidity reference condition.

14. Press READY when the reading has stabilized in the second

reference condition (may take 30 minutes or more). You can
follow the stabilization from the GRAPH display.

15. Enter the correct reference value in the second condition with

the arrow buttons. Press OK.

16. Confirm the adjustment by pressing YES (by pressing NO you

return to adjustment mode display and no changes are made). If
the difference between the two reference conditions is less than
50 %RH, adjustment can not be done.

17. The adjustment is done. Press BACK and EXIT to return to the

basic display.

18. Turn off the MI70 and detach the connection cable.

LiCl-NaCl Adjustment

This adjustment is done using relative humidity references 11.3 % RH
(LiCl) and 75.5 % RH (NaCl).

Follow steps 1 to 7

on page 37 and continue as follows:

8. Remove the filter from the transmitter's probe and insert the

probe head into the LiCl salt chamber.

9. Press ADJUST to continue adjusting.

10. Choose LiCl-NaCl autom. from the MI70 adjustment menu, press

SELECT. Press OK to accept the note telling about references.

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Chapter 9 _______________________________________ Calibration and Adjustment of Transmitters

VAISALA________________________________________________________________________ 41

11. Press READY when the reading has stabilized in the LiCl salt

chamber (may take 30 minutes or more). You can follow the
stabilization from the GRAPH display.

12. Remove probe from the LiCl salt chamber and insert the probe

head into the NaCl salt chamber.

13. Press READY when the reading has stabilized in the NaCl salt

chamber (may take 30 minutes or more). You can follow the
stabilization from the GRAPH display.

14. Confirm the adjustment by pressing YES (by pressing NO you

return to adjustment mode display and no changes are made).

15. The adjustment is done. Press BACK and EXIT to return to the

basic display.

16. Turn off the MI70 and detach the connection cable.

Calibration and Adjustment of HMP230/240
Transmitters and HMM210 Modules

You are able to check and adjust only humidity channel, temperature
channel can only be checked. Calibrate your transmitter/module
against a calibrated reference probe of HM70 or against a calibrator's
reference humidity by using MI70 indicator in communication.
Follow the first 12 steps and continue according to the chosen
calibration method.

1. In case you have a transmitter provided with heated probe, carry

out these preparations before calibration.

HMP240 transmitter with a probe heating: The heating
function is turned off automatically when the connection has
been established in step 10.

HMM210 module with chemical purge function (re-gain) or
with probe heating option: Before calibration activate the re-

gain function by resetting the device. Let stabilize to the ambient
conditions. Turn off the heating; use a calibration jumper
(HMM211) specified in the HMM211's User's Guide (section:
Temperature calibration of dewpoint module) or serial
commands (HMM213). For further information, see User's
Guide of the modules.

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42 ___________________________________________________________________ M210297EN-D

2. Connect the 27159ZZ-calibration cable to the

- X5 connector of the HMP230/HMP240-series transmitter
(X5 connector = 6-pin connector on the left side of the
motherboard).

- calibration connector of the HMM210 module.

3. Connect the other end of the calibration cable to either of the

HM70's connector port located on the bottom of the indicator,
see figure on page 35.

4. Turn on the HM70.

5. Open the MENU: press OPEN.

6. Select Functions, press .

7. Select Calibrate transmitters, press .

8. Select 1.Baud rate and 2.Serial format. Press SET to change the

serial settings. Serial settings of the transmitter/module and
HM70 shall be the same. HMP230/240 default serial settings:
4800, 7, even 1. HMM210 module's default settings: 1200, 8,
None. Note! HMM213 shall be in RUN or STOP mode.

9. Select 3.Start calibration, press START. If the serial settings of

HM70 are not compatible with the settings of HMP230, or the
cable connection is not working check that the serial settings of
HMP230 and the settings of HM70 are the same. Check the
cable connection. Then retry connection in step 6.

10. After connection has been established start the adjustment by

pressing OK.

11. Select the quantity to check RH/T (view only), press SELECT.

12. If RH selected, check the environment settings of HM70 probe,

if needed. Press YES or NO.
The first row shows the reading of the probe/transmitter
connected to the port I, the second row shows the reading of the
probe/transmitter connected to the port II. The third row RH/T is
the difference between the readings of the ports. By pressing

BACK you return to the selection display.

Example of the RH display

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VAISALA________________________________________________________________________ 43

Field Checking and Adjustment of
Humidity by Using a Calibrated
Reference Probe

Follow the steps from 1 to 12 and continue as follows:

13. Ensure that the probes are located in the same conditions.

14. Wait until the readings have stabilized. If the difference between

the humidity readings is less than 2 % RH, there is no immediate
need for adjustment.

15. Adjust the transmitter reading to correspond a reading of the

reference probe by pressing ADJUST.

16. Select To same as RH

I/II

. Press SELECT.

17. Confirm by pressing YES

18. Press BACK, EXIT, EXIT to return to the basic display.

1-Point Humidity Adjustment by
Using a Calibrator

You can use Vaisala humidity calibrator HMK15 to achieve the
reference humidities. MI70 indicator is working as a communicator in
the calibration procedure.

Follow the steps from 1 to 12 and continue as follows:

13. Insert the transmitter probe to the reference humidity

14. Press ADJUST

15. Select 1-point adjustment. press SELECT

16. Wait until the reading is stabilized (takes about 30 minutes).

You can follow the stabilization from the GRAPH display.

17. Press READY when the value is stabilized in the reference

humidity.

18. Enter the correct humidity value by using the arrow buttons.

Press OK.

19. Confirm by pressing YES

20. Press BACK, EXIT, EXIT to return to the basic display.

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2-Point Adjustment by Using a
Calibrator

You can use Vaisala humidity calibrator HMK15 in calibration and
adjustment. Note that the difference between the two reference
humidities shall be at least 50 %. MI70 indicator is working as a
communicator in the calibration procedure.

Follow the steps from 1 to 12 and continue as follows:

13. Insert the transmitter probe to the first reference humidity.

14. Press ADJUST

15. Select 2-point adjustment. press SELECT

16. Wait until the reading is stabilized (takes about 30 minutes).

You can follow the stabilization from the GRAPH display.

17. Press READY when the value is stabilized in the first reference

humidity.

18. Enter the first reference humidity value by using the arrow

buttons. Press OK.

19. Insert the transmitter probe to the second reference humidity.

20. Wait until the reading is stabilized (takes about 30 minutes or

more). You can follow the stabilization from the GRAPH
display.

21. Press READY when the value is stabilized in the second

reference humidity.

22. Enter the second reference humidity value by using the arrow

buttons. Press OK.

23. Confirm by pressing

YES

24. Press

BACK, EXIT, EXIT to return to the basic display.

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VAISALA________________________________________________________________________ 45

Calibration and Adjustment of HMT320 Series
Transmitters

You can check and adjust both humidity and temperature channels.
Make the temperature adjustment first in case you adjust both
channels. Calibrate your transmitter against a calibrated reference
probe of HM70 or against a calibrator's reference humidity by using
MI70 indicator in communication. Follow the first 8 steps and
continue according to the chosen calibration method.

1. Connect the 211339-calibration cable to the RS232 connector in

the mother board of the HMP300-series transmitter

2. Connect the other end of the calibration cable to either of the

HM70's connector port located on the bottom of the indicator,
see figure on page 35.

3. Turn on both devices (the HMT300-series transmitter can be on

all the time).

4. The reading of the transmitter is shown on the first or middle

row of the display, depending on the connector port to which the
calibration cable is connected. Value of the port I is shown on
the upper row of the display and the value of the port II on the
lower row of the display. Difference of the readings is shown in
the lowest row.

5. Take off the CAL.DIS jumper from the motherboard of the

HMT300 transmitter. Now MI70 is moved into Adjustment

mode.

6. Press

OK to start adjustment.

7. Select

RH or T, press SELECT.

8. Check the environment settings, if needed. Otherwise press

NO.

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Field Checking and Adjustment by
Using a Calibrated Reference Probe

Follow the steps from 1 to 8 and continue as follows:

9. Check that the probes are located in equal conditions and wait until

the readings are stabilized (can take 30 minutes or more). If you
are near the probes, do not breathe in their direction.

10. Press ADJUST to continue adjusting.

11. Press To same asRH

Ii/I

., press SELECT. (MI70 recognizes always the

port to which the HMP70-series probe is connected).

12. Confirm by pressing YES.

13. Adjustment is done. Press BACK and EXIT to return to the

basic display.

14. Replace the CAL.DIS jumper.

15. Switch off the MI70 and detach the calibration cable from MI70

and from the transmitter.

1-Point Adjustment by Using a
Calibrator

When adjusting a transmitter only in one reference condition, please
take care that the reference condition represents well the measuring
environment.

If you use humidity calibrator HMK15, please use the adapter fitting
(13.5 mm) on the measurement hole if you calibrate probes of
HMT324, HMT325, HMT327 and HMT328.

Follow the steps from 1 to 8 and continue as follows:

9. Remove the filter from the transmitter's probe and insert the

probe head into the reference condition.

10. Press ADJUST to continue adjusting.

11. Select 1-point adjustment, press SELECT.

12. Press READY when the reading is stabilized in the reference

condition (takes about 30 minutes or more). You can follow the
stabilization from the

GRAPH display.

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VAISALA________________________________________________________________________ 47

13. Enter correct reference value by using the arrow buttons. Press

OK.

14. Confirm by pressing YES.

15. Adjustment is done. Press BACK and EXIT to return to the

basic display.

16. Replace the jumper to CAL.RH pins.

17. Switch off HM70 and detach the calibration cable from MI70

and from the transmitter.

2-Point Adjustment by Using a
Calibrator

Note that the difference between the two reference humidities shall be
at least 50 %. MI70 indicator is used now as a communicator. HMP70
probe can be connected or it can be removed while making this
adjustment.

If you use humidity calibrator HMK15, please use the adapter fitting
(13.5 mm) on the measurement hole if you calibrate probes of
HMT324, HMT325, HMT327 and HMT328.

Follow the steps from 1 to 8 and continue as follows:

9. Remove the filter from the transmitter's probe and insert the

probe head into lower reference humidity.

10. Press ADJUST to continue adjusting.

11. Select

2-point adjustment, press SELECT.

12. Press

READY when the reading is stabilized in the first

reference condition (takes about 30 minutes or more).

13. Enter correct reference value by using the arrow buttons. Press

OK.

14. Remove the probe and insert the probe head into higher

reference humidity. You can follow the stabilization from the

GRAPH display (takes about 30 minutes or more).

15. Press READY when the reading is stabilized in the second

reference condition.

16. Give the higher reference humidity value by using the arrow

buttons. Press OK.

17. Confirm the adjustment, press YES (by pressing NO you

return to adjustment mode display and no changes are made). If

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48 ___________________________________________________________________ M210297EN-D

the difference between two references is less than 50 %,
adjustment can not be done.

18. Adjustment is done. Press BACK to exit the adjustment mode

press EXIT to return to the basic display.

19. Replace the jumper to CAL.RH pins.

20. Switch off MI70 and detach the calibration cable from the MI70

and from the transmitter.

Calibration and Adjustment of HMT330 Series
Transmitters

You can check and adjust both humidity and temperature channels of
the HMT330. If you adjust both channels, make the temperature
adjustment first.

Calibrate your transmitter against a calibrated reference probe of
HM70 or against a calibrator's reference humidity by using MI70
indicator in communication. Follow the first 8 steps and continue
according to the chosen calibration method.

1. Connect the 211339-calibration cable to the SERVICE PORT

connector on the mother board of the HMP330.

2. Connect the other end of the calibration cable to either of the

HM70's connector port located on the bottom of the indicator,
see figure on page 35.

3. Turn on both devices.

4. The reading of the transmitter is shown on the first or middle

row of the display, depending on the connector port to which the
calibration cable is connected. Value of the port I is shown on
the upper row of the display and the value of the port II on the
lower row of the display. Difference of the readings is shown on
the lowest row.

5. If you have HMT330 with the optional chemical purge option,

you should activate the chemical purge before calibration and
adjustment. You can do this via the MI70 indicator: open the

MENU; press OPEN select Functions, press START and YES.

Wait until the purge is complete before continuing with
calibration and adjustment.

6. Press the ADJ button (on the mother board of the HMT330) to

open the adjustment mode. The indicator led (on the
motherboard of the HMT330) starts flashing.

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Chapter 9 _______________________________________ Calibration and Adjustment of Transmitters

VAISALA________________________________________________________________________ 49

From now on the adjustment is carried out by using the MI70
indicator.

7. Press OK to start adjustment.

8. Select RH or T, press SELECT.

9. If RH selected, check the environment settings, if needed.

Otherwise press NO.

Field Checking and Adjustment by
Using a Calibrated Reference Probe

Follow the steps from 1 to 8 on page 48 and continue as follows:

9. Check that the probes are located in equal conditions and wait

until the readings are stabilized (can take 30 minutes or more). If
you are near the probes, do not breathe in their direction.

10. Press

ADJUST to continue adjusting.

11. Press To same asRH

Ii/I

, press SELECT. (MI70 recognizes always

the port to which the HMP70-series probe is connected).

12. Confirm by pressing YES.

13. Adjustment is done. Press BACK and EXIT to return to the

basic display.

14. Switch off the MI70 and detach the calibration cable.

1-Point Adjustment by Using a
Calibrator

When adjusting a transmitter only in one reference condition, please
take care that the reference condition represents the measuring
environment. MI70 indicator is used now in communication.

If you use humidity calibrator HMK15, please use the adapter fitting
(13.5 mm) on the measurement hole if you calibrate probes of
HMT334, HMT335, HMT337 and HMT338.

Follow the steps from 1 to 8 on page 48 and continue as follows:

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50 ___________________________________________________________________ M210297EN-D

9. Remove the filter from the transmitter's probe and insert the

probe head into the reference condition.

10. Press ADJUST to continue adjusting.

11. Select 1-point adjustment, press SELECT.

12. Press READY when the reading is stabilized in the reference

condition (takes about 30 minutes or more). You can follow the
stabilization from the GRAPH display.

13. Enter correct reference value by using the arrow buttons. Press

OK.

14. Confirm by pressing YES.

15. Adjustment is done. Press BACK and EXIT to return to the

basic display.

16. Switch off the MI70 and detach the calibration cable.

2-Point Adjustment by Using a
Calibrator

Note that the difference between the two reference humidities shall be
at least 50 %. MI70 indicator is used now in communication.

If you use humidity calibrator HMK15, please use the adapter fitting
(13.5 mm) on the measurement hole if you calibrate probes of
HMT334, HMT335, HMT337 and HMT338.

Follow the steps from 1 to 8 on page 48 and continue as follows:

9. Remove the filter from the transmitter's probe and insert the

probe head into lower reference humidity.

10. Press ADJUST to continue adjusting.

11. Select 2-point adjustment, press SELECT.

12. Press READY when the reading is stabilized in the first

reference condition (takes about 30 minutes or more).

13. Enter correct reference value by using the arrow buttons. Press

OK.

14. Remove the probe and insert the probe head into higher

reference humidity. You can follow the stabilization from the

GRAPH display (takes about 30 minutes or more).

15. Press READY when the reading is stabilized in the second

reference condition.

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VAISALA________________________________________________________________________ 51

16. Give the higher reference humidity value by using the arrow

buttons. Press OK.

17. Confirm the adjustment, press YES (by pressing NO you

return to adjustment mode display and no changes are made). If
the difference between two references is less than 50 %,
adjustment can not be done.

18. Adjustment is done. Press

BACK to exit the adjustment mode

press

EXIT to return to the basic display.

LiCl-NaCl Adjustment

This adjustment is done by using relative humidity references: 11.3 %
RH (LiCl) and 75.5 % RH (NaCl)

If you use humidity calibrator HMK15, please use the adapter fitting
(13.5 mm) on the measurement hole if you calibrate probes of
HMT334, HMT335, HMT337 and HMT338.

Follow the steps from 1 to 8

on page 48 and continue as follows:

9. Remove the filter from the transmitter's probe and insert the

probe head into 11.3 % RH reference humidity.

10. Press ADJUST to continue adjusting.

11. Select LiCl-NaCl autom., press SELECT. Press OK to accept the

note telling about references.

12. Press

READY when the reading is stabilized in the first

reference condition (takes about 30 minutes or more)

.

13. Remove the probe and insert the probe head into 75.5 %

reference humidity. You can follow the stabilization from the

GRAPH display (takes about 30 minutes or more).

14. Press READY when the reading is stabilized in the second

reference condition.

15. Confirm the adjustment, press YES (by pressing NO you

return to adjustment mode display and no changes are made).

16. Adjustment is done. Press BACK to exit the adjustment mode

press EXIT to return to the basic display.

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52 ___________________________________________________________________ M210297EN-D

Field Checking of DMW19 Transmitter

You are able to use MI70 as a display and check your DMW19
transmitter against a calibrated reference probe of HM70.

1. Turn on the DMW19.

2. Remove the lid of the DMW19 transmitter.

3. Connect the 211917ZZ- cable to the 6-pins test connector (cable

connector position: Vaisala-logo on top) of the DMW19.

4. Connect the other end of the calibration cable to either of the

HM70's connector port located on the bottom of the indicator, see
figure on page 35.

5. Turn on the HM70.

6. The reading of the DMW19 transmitter is shown on the first or

middle row of the HM70 display, depending on the connector port
to which the calibration cable is connected. Value of the port I is
shown on the upper row of the display and the value of the port II
on the lower row of the display. Difference of the readings is
shown in the lowest row.

7. Turn off the HM70.

8. Remove the connection cable and replace the lid of the DMW19.

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Chapter 10 ____________________________________ Measuring Other Parameters Simultaneously

VAISALA________________________________________________________________________ 53

CHAPTER 10

MEASURING OTHER PARAMETERS
SIMULTANEOUSLY

The MI70 indicator is a generic indicator that can be used with
Vaisala interchangeable dewpoint (DMP) and carbon dioxide (GMP)
probes. Two different probes can be used simultaneously.

1. Turn off the device.

2. Connect the DMP70/GMP70 probe to the other connector port in

the bottom of the indicator.

3. Turn on the device.

4. Check that the pressure settings of the probes (port I and II) are the

same, if you are taking measurements from the same condition.

5. The display shows now the reading of the port I probe in the upper

row(s) and the reading of the port II in the lower row(s).

Example of the display when carbon dioxide and humidity probe
connected simultaneously to the MI70 indicator.

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Chapter 11 ___________________________________________________ Analog Output Connection

VAISALA________________________________________________________________________ 55

CHAPTER 11

ANALOG OUTPUT CONNECTION

Selecting and Scaling the Analog
Output

→ →→

To get analog measurement data, you need the analog output signal
cable, see list of accessories on page 73. One voltage signal channel

0...1.0V can be scaled for the selected quantity.

1. Connect the analog output signal cable connector to the indicator

base connector. Connect the screw terminal block as follows:

Brown wire: common wire (-)
Yellow-green wire: signal (+)

2. Open the MENU: press OPEN.

3. Select Functions, press .

4. Select Analog output, press .

5. Select Quantity and press SET to choose a quantity.

6. Select

Quantity, press SELECT. (One quantity can be chosen at a

time. Only active quantities can be selected. To change the
quantities, go to

MENU Display Quantities and units).

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7. Select 0.0 V to set the value for the 0.0V output signal, press SET.

(If the analog output is ON, take it OFF) Set the low value by
using arrow buttons. Press +/- button to choose the sign of the
value. Press OK to make the setting.

8. Select 1.0V to set the value for the 1.0V output signal, press SET.

Set the high value by using arrow buttons. Press +/- button to
choose the sign of the value. Press OK to make the setting.

9. Select Analog output on/off, press ON to activate the analog output

and return back to the basic display.

10. A wave picture sign appears on the upper left corner of the

basic display.

11. To deactivate the analog output function, go to MENU→Functions

Analog output Analog output on/off and press OFF.

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Chapter 12 _______________________________ Calibration and Adjustment of HM70 Series Probes

VAISALA________________________________________________________________________ 57

CHAPTER 12

CALIBRATION AND ADJUSTMENT OF
HM70 SERIES PROBES

General Information about Calibrations

The HM70 is fully calibrated as shipped from factory. Adjustment
shall be done if there is a reason to believe that device is not within
the accuracy specifications. However, if HM70 is used as a reference
instrument in humidity measurements, the humidity recalibration is
recommended every year.

It is recommended to send the device to Vaisala Service Centers for
calibration, see contact information on page 66. Alternatively user can
calibrate and adjust HM70 by following the instructions given in this
chapter.

When using Vaisala humidity calibrator HMK15, use the adapter
fitting (13.5 mm hole) with the probes HMP76 and HMP77. Probe
HMP75 does not need the adapter fitting. If chemical purge option is
available, it should always be performed before calibration, see page

30.

Before starting the adjustment mode, take out the screw covering the
calibration button.

Calibration button
(under the screw)

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58 ___________________________________________________________________ M210297EN-D

Relative Humidity Adjustment

LiCl-NaCl Automatic Adjustment

LiCl-NaCl automatic adjustment is a two-point adjustment in
reference humidities of 11.3 % (LiCl) and 75 % (NaCl). You don't
have to feed the reference values, the HM70 displays the accurate
value based on the measured temperature and the Greenspan table
stored into the memory of the HM70. Make the adjustment as
instructed in the following section 2-Point Adjustment (select LiCl--NaCl

autom.

on item 9 and follow the display instructions).

2-Point Adjustment

Low humidity references 0 % (Nitrogen)/ 11.3 % (LiCl) and higher
humidity references 75 % (NaCl)/ 97 % (K2SO4) are recommended for
two-point adjustment. Ensure that the difference between the humidity
references is more than 50 %.

1. When adjusting both relative humidity and temperature, please

make the temperature adjustment first.

2. Check that the HM70 is switched on.

3. If chemical purge option is available perform it before

adjustment, see page 30.

4. Take out the screw from the probe handle to expose the

calibration button. Press the button with a small screwdriver.
When pressing the button, indicator turns to adjusting mode.

5. Press OK to start the adjustment mode.

6. Select RH, press SELECT.

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Chapter 12 _______________________________ Calibration and Adjustment of HM70 Series Probes

VAISALA________________________________________________________________________ 59

7. Press YES to check the environmental settings, to continue

directly adjustment press NO.

8. Now the adjustment mode is on, press ADJUST to select the

adjustment method.

9. Select 2-point adjustment, press SELECT. Press OK to continue.

10. Set the probe to a lower reference relative humidity. If using

HMK15 calibrator, use the adapter fitting (13.5 mm hole) with
probes HMP76 and HMP77.

You can follow the stabilization from the GRAPH display.
Press READY when the reading is stabilized.

11. Give the lower reference humidity value by using the arrow

buttons. Press

OK.

12. Set the probe to the higher reference humidity. Press READY

when the reading is stabilized. You can follow the stabilization
from the GRAPH display.

13. Give the higher reference relative humidity value by using the

arrow buttons. Press OK.

14. Confirm the adjustment, press YES (by pressing NO you

return to adjustment mode display and no changes are made). If
the difference between two references is less than 50 %,
adjustment can not be done.

15. Adjustment has been carried out. Press BACK to exit the

adjustment mode press EXIT to return to the basic display.

16. Replace the screw onto calibration button.

You can attach a sticker on the calibration button screw to seal the
calibration.

1-Point Adjustment

Usually it is recommended to make an adjustment in two reference
humidities. If adjustment is done by using one reference humidity (1-
point adjustment), select the reference humidity so that it represents
the measuring environment. Make the adjustment in one point as
instructed in the previous section 2-Point Adjustment (select 1-point

adjustment

and follow the display instructions).

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Temperature Adjustment

Temperature adjustment in one or two points can be done if there is
reason to believe that the adjustment is changed. If adjustment is done
only in one point, reference condition shall represent the measuring
environment.

1. Take out the screw covering the calibration button (in the probe

handle).

2. Press the calibration button. For pressing, use tool with thin and

sharp point, such as small screwdriver. When pressing the
button, indicator turns to adjusting mode.

3. Select T, press SELECT.

4. Now the adjustment mode is on, press ADJUST to select the

adjustment method: 1-point adjustment or 2-point adjustment.

1-Point Adjustment

Follow the steps from 1 to 4 and continue as follows:

5. Select 1-point adjustment, press SELECT.

6. Set the probe to a reference temperature. You can follow the

stabilization from the GRAPH display. Press READY when the
reading is stabilized in the reference.

7. Give the reference temperature value by using the arrow

buttons. Press OK.

8. Confirm the adjustment, press YES. (By pressing NO you

return to adjustment mode display and no changes are made).

9. Calibration is carried out. Press

BACK to exit the adjustment

mode and

EXIT to return to the basic display.

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Chapter 12 _______________________________ Calibration and Adjustment of HM70 Series Probes

VAISALA________________________________________________________________________ 61

2-Point Adjustment

Follow the steps from 1 to 4 and continue as follows:

5. Select 2-point adjustment. Press SELECT to continue.

6. Set the probe to a lower reference temperature. You can follow

the stabilization from the GRAPH display.

7. Press READY when the reading is stabilized. Give the lower

reference temperature by using the arrow buttons. Press OK.

8. Set the probe to the higher reference temperature. You can

follow the stabilization from the GRAPH display. Press

READY when the reading is stabilized.

9. Give the higher reference temperature by using the arrow

buttons. Press OK.

10. Confirm the adjustment, press YES. (By pressing NO you

return to adjustment mode display and no changes are made). If
the difference between two references is less than 30 ºC,
adjustment can not be done.

11. Calibration is carried out. Press BACK to exit the adjustment

mode and EXIT to return to the basic display.

Last Adjustment Date

To see the last adjustment date, select Last adjustment date. You can
check this date also from the Device information, see page 23.

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Chapter 13 ___________________________________________________________ Error Messages

VAISALA________________________________________________________________________ 63

CHAPTER 13

ERROR MESSAGES

If HM70 displays an error message, check first that the sensor is connected
properly and let the probe dry if there is condensed water in the probe.

In case of constant error, please contact Vaisala Service Centers (see page 66).

Error Messages

− Voltage required for Purge unavailable

− Voltage required for Preheat unavailable

− Eeprom read/write error

− ADC malfunction

− Operating voltage out of range

− Analog voltage out of range

− Temperature/Humidity sensor open/short circuit

− Temperature sensor current leak

− Temperature/humidity measurement malfunction

− Temperature value out of range

− Relative humidity value out of range

− Sensor not found

− Amplifier chain malfunction

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Chapter 14 ______________________________________________________________ Maintenance

VAISALA________________________________________________________________________ 65

CHAPTER 14

MAINTENANCE

Changing the Filter

1. Screw out the dirty filter from the probe head (Figure 1 on page 7). Don't try to clean

the filter. Avoid touching the sensor.

2. Screw on the new filter.

Changing the Battery Pack

A new rechargeable battery pack can be ordered from Vaisala. Change the battery pack as
follows:

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 pulling up carefully from

the wires.

3. Connect the black connector of the new battery pack, ensure that the position of the

connector is as indicated in figure (red and black wires are on the upper edge of the
connector). Do not push the connector with conducting material, e.g. metallic
screwdriver.

4. Place the battery pack, close the back plate and tighten the screw.

5. Charge the battery pack before use, see page

9.

In case you are installing battery pack and you have a device with alkaline batteries,
remove the metal contact before installing the battery pack.

Black connector

A (

2

WHT

Connector
position:
White wires
below.

Installing the battery

Metal contact

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Vaisala Service Centers

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Chapter 15 _____________________________________________________Technical Specifications

VAISALA________________________________________________________________________ 67

CHAPTER 15

TECHNICAL SPECIFICATIONS

Probes HMP75, HMP76 and HMP77

Measured Variables

Relative Humidity

Measurement range 0 ... 100%RH

Accuracy (including non-linearity, hysteresis and repeatability)
at +20 ºC 1 % RH (0 ... 90 % RH)

1.7 % RH (90 ... 100 % RH)
at -20...+40 ºC (1.0 + 0.008 x reading) % RH
at -40 ... -20 ºC, +40 ... +180 ºC
(1.5 + 0.015 x reading) % RH

Factory calibration uncertainty

(**)

(+20 ºC)
± 0.6 % RH (0...40 % RH)
± 1.0 % RH (40...97 % RH)

Humidity sensors:
HUMICAP

®

180

HUMICAP® 180C (chemical purge, sensor preheat)

(**)

Defined as ±2 standard deviation limits. Small variations possible,

see also calibration certificate.

Response time (90 %) at 20 ºC in still air
8 s with grid filter
20 s with grid + steel netting filter
40 s with sintered filter

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Temperature

Measurement ranges

HMP75 -20 ... +60 ºC
HMP76 -50 ... +120 ºC
(to+180 ºC temporarily)
HMP77 -70 ... +180 ºC
Accuracy at +20°C ±0.2 °C

Accuracy over temperature range (see graph):

Temperature sensor Pt 100 RTD 1/3 Class B IEC 751

Calculated Variables

Typical Ranges

Dewpoint temperature -20 ... +100 ºC, -4 ... +212 ºF
Mixing ratio 0 ... 600 g/kg dry air
Absolute humidity 0 ... 600 g/m3
Wet bulb temperature 0 ... +100 ºC, 32 ... +212 ºF
Enthalpy 0 ... 160 kJ/g
Water vapor pressure 0 ... 1000 hPa

∆

°C

°C

-0.7

0.7

0.6

0.5

0.4

0.3

0.2

0.1

-0.1

-0.2

-0.3

-0.4

-0.5

-0.6

0

0-60-40-20 20406080100

120

140

160

180

-80

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Chapter 15 _____________________________________________________Technical Specifications

VAISALA________________________________________________________________________ 69

Accuracies of Calculated Variables

Accuracies of the calculated variables depend on the calibration
accuracy of the humidity and temperature sensors; here the accuracies

are given for ±2 %RH and ±0.2 °C.

Accuracy of Dewpoint Temperature °C

Relative humidity
Temp. 10 20 30 40 50 60 70 80 90 100

-40 1.86 1.03 0.76 0.63 0.55 0.50 0.46 0.43 — —

-20 2.18 1.19 0.88 0.72 0.62 0.56 0.51 0.48 — —
0 2.51 1.37 1.00 0.81 0.70 0.63 0.57 0.53 0.50 0.48
20 2.87 1.56 1.13 0.92 0.79 0.70 0.64 0.59 0.55 0.53
40 3.24 1.76 1.27 1.03 0.88 0.78 0.71 0.65 0.61 0.58
60 3.60 1.96 1.42 1.14 0.97 0.86 0.78 0.72 0.67 0.64
80 4.01 2.18 1.58 1.27 1.08 0.95 0.86 0.79 0.74 0.70
100 4.42 2.41 1.74 1.40 1.19 1.05 0.95 0.87 0.81 0.76
120 4.86 2.66 1.92 1.54 1.31 1.16 1.04 0.96 0.89 0.84
140 5.31 2.91 2.10 1.69 1.44 1.26 1.14 1.05 0.97 0.91
160 5.80 3.18 2.30 1.85 1.57 1.38 1.24 1.14 1.06 0.99

Accuracy of Mixing Ratio g/kg

(ambient pressure 1013 mbar)

Relative humidity
Temp. 10 20 30 40 50 60 70 80 90 100

-40 0.003 0.003 0.003 0.003 0.003 0.004 0.004 0.004 — —

-20 0.017 0.018 0.019 0.021 0.022 0.023 0.025 0.026 — —
0 0.08 0.09 0.09 0.10 0.10 0.11 0.11 0.12 0.13 0.13
20 0.31 0.33 0.35 0.37 0.39 0.41 0.43 0.45 0.47 0.49
40 0.97 1.03 1.10 1.17 1.24 1.31 1.38 1.46 1.54 1.62
60 2.68 2.91 3.16 3.43 3.72 4.04 4.38 4.75 5.15 5.58
80 6.73 7.73 8.92 10.34 12.05 14.14 16.71 19.92 24.01 29.29
100 16.26 21.34 28.89 40.75 60.86 98.85 183.66 438.56 — —
120 40.83 74.66 172.36 — — — — — — —

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Accuracy of Wet Bulb Temperature °C

Relative humidity
Temp. 10 20 30 40 50 60 70 80 90 100

-40 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 — —

-20 0.21 0.21 0.22 0.22 0.22 0.22 0.23 0.23 — —
0 0.27 0.28 0.28 0.29 0.29 0.29 0.30 0.30 0.31 0.31
20 0.45 0.45 0.45 0.44 0.44 0.44 0.43 0.43 0.42 0.42
40 0.84 0.77 0.72 0.67 0.64 0.61 0.58 0.56 0.54 0.52
60 1.45 1.20 1.03 0.91 0.83 0.76 0.71 0.67 0.63 0.60
80 2.23 1.64 1.32 1.13 0.99 0.89 0.82 0.76 0.72 0.68
100 3.06 2.04 1.58 1.31 1.14 1.01 0.92 0.85 0.80 0.75
120 3.85 2.40 1.81 1.48 1.28 1.13 1.03 0.95 0.88 0.83
140 4.57 2.73 2.03 1.65 1.41 1.25 1.13 1.04 0.97 0.91
160 5.25 3.06 2.25 1.82 1.55 1.37 1.24 1.13 1.05 0.99

Accuracy of Absolute Humidity g/m³

Relative humidity
Temp. 10 20 30 40 50 60 70 80 90 100

-40 0.004 0.004 0.005 0.005 0.005 0.006 0.006 0.006 — —

-20 0.023 0.025 0.027 0.029 0.031 0.032 0.034 0.036 — —
0 0.10 0.11 0.12 0.13 0.13 0.14 0.15 0.15 0.16 0.17
20 0.37 0.39 0.41 0.43 0.45 0.47 0.49 0.51 0.53 0.55
40 1.08 1.13 1.18 1.24 1.29 1.34 1.39 1.44 1.49 1.54
60 2.73 2.84 2.95 3.07 3.18 3.29 3.40 3.52 3.63 3.74
80 6.08 6.30 6.51 6.73 6.95 7.17 7.39 7.61 7.83 8.05
100 12.2 12.6 13.0 13.4 13.8 14.2 14.6 15.0 15.3 15.7
120 22.6 23.3 23.9 24.6 25.2 25.8 26.5 27.1 27.8 28.4
140 39.1 40.0 41.0 42.0 43.0 44.0 45.0 45.9 46.9 47.9
160 63.5 64.9 66.4 67.8 69.2 70.7 72.1 73.5 74.9 76.4

General

Humidity sensor HUMICAP 180
Temperature sensor Pt100 IEC751 1/3 class B

Operating temperature range for electronics

-40 ... +60 °C, -40 ... +140 °F

Standard sensor protection
HMP75 Plastic grid
HMP76 Sintered bronze filter
HMP77 Grid with SS netting

Housing classification IP65 (NEMA 4)
Housing material ABS/ PC blend
Probe material Stainless steel (AIS316L)

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Probe cable length
(between indicator and the probe handle) 1.9 m
Probe head cable length of HMP77
(from handle to the root of the probe head) 5.0 m
Probe head diameter 12 mm (0.47 inch)
Weight
HMP75 250 g
HMP76 350 g
HMP77 500 g

MI70 Indicator

Indicator General

Operating temperature range -10 ... + 40 °C
Operating humidity 0 ... 100 %RH , non-condensing

Menu languages English, Finnish, French, German,

Spanish, Swedish

Display LCD with backlight
Graphic trend display of any

quantity
Character height up to 16mm
Probe inputs 1 or 2
Power supply Rechargeable NIMH battery pack

with AC-POWER or 4 x AA size

alkalines, type IEC LR6

Analog output 0 ... 1 VDC
Output resolution 0.6 mV
Accuracy 0.2 % full scale
Temperature dependence 0.002 %/°C full scale
Minimum load resistor 10 kΩ to ground

Data interface RS232C (EIA-232)
Data logging capacity 900 ... 2700 real time data points,
Logging interval 1 s to 12 h
Logging duration 1 min ... memory full

Alarm Audible alarm function

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Housing classification IP54
Weight 400 g
Housing material ABS/PC-blend

Battery Pack

Operation times in
continuous use 48 h typical at +20 °C
data logging use at least 30 days
Power consumption during charge 10W max
Charging time 4 hour

General about Vaisala Hand-Held Humidity and
Temperature Meter HM70

Storage temperature -40 ... +70 °C
Storage humidity range 0 ... 100 % (non-

condensing)

Electromagnetic Compatibility

Complies with the following standard:

EN 61326-1:1997 +Am 1:1998+ Am 2:2001, Electrical equipment for
measurement, control and laboratory use - EMC requirements:
Portable.

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Accessories

Description Order code

AC-Adapters

Euro AC-adapter MI70EUROADAPTER
UK AC-adapter MI70UKADAPTER
US AC-adapter MI70USADAPTER
AUS AC-adapter MI70AUSADAPTER

Connection cables

Analog output signal cable 27168ZZ
Connection cable for HM60/70/140 series HMA6070
Connection cable for HM20/30/130 series HMA2030
Connection cable for HMDM200 series 27159ZZ
Connection cable for HM320/330-series 211339
Connection cables for DMW19 211917ZZ

Carrying cases

Carrying case for one probe (HMP75 or HMP77) MI70CASE
Carrying case for two probes (HMP75 and HMP76 or
GMP-probe)

MI70CASE2

Probe accessories

HMP75

Plastic PC grid filter
Membrane filter
Sintered bronze filter

6221
10159HM

DRW212987SP
HMP76/77
Plastic PPS grid filter
Sintered stainless steel filter
Sintered bronze filter (HMP76 standard)
PPS grid with SS netting (HMP77 standard)
Probe holder (only for HMP76)

DRW010276SP

HM47280SP

DRW212987SP

DRW010281SP

HM36915

Others

Measurement indicator MI70
MI70 Link- software interface kit (including cable) MI70LINK

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Dimensions in mm (inches)

2

0

5

(

8

.

0

7

)

1

1

8

(

4

.

6

5

)

Ø 12 (0.47)

MI70 Indicator HMP75 Probe

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HMP76 Probe HMP77 Probe

ø 12 (0.47)

37.5 (1.48)

79.5 (3.13)

99.5 (3.92)

M9×1

HMP77 Sensor head

3

2

8

(

1

2

.

9

1

)

Ø

12 (0.47)

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www.vaisala.com

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