Vaisala CARBOCAP GM70 User Manual

r

USER'S GUIDE

Vaisala CARBOCAP® Hand-Held

Carbon Dioxide Mete

GM70

M010139EN-D

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.

___________________________________________________________________

Table of Contents

CHAPTER 1

GENERAL INFORMATION....................................................... 7

About This Manual .................................................7

Feedback.............................................................. 7

Safety.......................................................................

General Safety Considerations.............................

Product Related Safety Precautions..................... 8

ESD Protection..................................................... 8

Recycling................................................................. 9

Trademarks ............................................................. 9

License Agreement ................................................ 9

Warranty................................................................ 10

8

8

CHAPTER 2

PRODUCT OVERVIEW ..........................................................11

Introduction to Vaisala CARBOCAP® Hand-Held

Carbon Dioxide Meter GM70................................ 11

Basic Features of the GM70...............................11

Interchangeable Probes ..................................... 12

Tool for Adjustments ..........................................

Parts Description..................................................

Probes ...................................................................

GM70PUMP for Aspirated Sampling ...................

CHAPTER 3

PREPARATIONS BEFORE USE............................................17

Recharging the Batteries ..................................... 17

Turning On and Setting Language, Date, and

Time ....................................................................... 18

12

13
14
15

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User's Guide_________________________________________________________

CHAPTER 4

MEASURING CARBON DIOXIDE...........................................19

Taking Measurements (Diffusion Sampling) ......19

Taking Measurements (Pump Aspirated

Sampling)...............................................................20

Measuring Other Parameters Simultaneously....22

CHAPTER 5

BUTTONS, DISPLAYS, AND MENUS ....................................23

Buttons and Navigation........................................23

Basic Display.........................................................24

Graphical Display..................................................25

Menus.....................................................................25

CHAPTER 6

SETTINGS...............................................................................27

Setting Actual Pressure Value and Unit..............27

Setting Actual Temperature Value and Unit .......28

Display Settings ....................................................29

Display Units.......................................................29

Rounding ............................................................30

Hold/Save Display ..............................................30

Graphic History ...................................................31

User Interface ........................................................31

Selecting Language ............................................32

Automatic Power Off...........................................

Changing the Shortcut Keys ...............................

Key Click and Backlight On Key Press ...............

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

32
33
34
34

Device Information................................................35

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

Other Settings .......................................................

Setting the Alarm Levels .....................................

36

36

36

CHAPTER 7

ANALOG OUTPUT CONNECTION.........................................39

Selecting and Scaling the Analog Output...........39

2 ______________________________________________________ M010139EN-D

___________________________________________________________________

CHAPTER 8

RECORDING DATA................................................................ 41

Recording.............................................................. 41

Stop Recording..................................................... 43

Viewing Recorded Data........................................43

Checking Memory Status..................................... 43

Deleting All Recorded Files ................................. 44

Transferring Recorded Data to PC...................... 44

Real-Time Monitoring with PC............................. 44

CHAPTER 9

FIELD CHECKING OF FIXED TRANSMITTERS....................

45

Field Checking of the Vaisala GMD/W20 Series

Transmitters (Diffusion Sampling)...................... 45

Field Checking of the Vaisala GMD/W20 Series

Transmitters (Pump Aspirated Sampling) .......... 46

Field Checking of the GMT220

(Without a Display) ............................................... 48

CHAPTER 10

CALIBRATING AND ADJUSTING THE PROBES ................. 49

Calibration Interval ............................................... 49

Factory Calibration and Adjustment................... 49

Calibration and Adjustment by the User ............50

Adjustment with Reference Gases...................... 51

Equipment Needed.............................................

Reference Gases ...............................................

Two-Point Adjustment Procedure.......................

One-Point Adjustment Procedure.......................

51
51
52
54

Adjustment with Two Probes ..............................56

CHAPTER 11

ERROR MESSAGES ..............................................................

CHAPTER 12

57

MAINTENANCE...................................................................... 59

Changing the Probe.............................................. 59

Changing the Probe Filter.................................... 60

Cleaning ................................................................60

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

61

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User's Guide_________________________________________________________

Technical Support.................................................62

Return Instructions ...............................................62

Vaisala Service Centers........................................63

CHAPTER 13

TECHNICAL SPECIFICATIONS .............................................65

GM70 Hand-Held Carbon Dioxide Meter .............65

General...........................................................65

Electromagnetic Compatibility ........................65

GMP221/222 Probes..............................................66

GMH70 Handle, GM70PUMP.................................67

MI70 Indicator........................................................

Indicator General ............................................

Battery Pack ...................................................68

Accessories...........................................................68

Dimensions in mm (inch) .....................................69

67

67

List of Figures

Figure 1 GM70 Parts.............................................................13

Figure 2 Properly Connecting the GM70PUMP.....................21

Figure 3 Example of the Display when the Carbon Dioxide,

and the Temperature and Humidity Probe are

Connected Simultaneously to the MI70 Indicator....22

Figure 4 MI70 Indicator Buttons ............................................23

Figure 5 Basic Display ..........................................................

Figure 6 Menus .....................................................................

Figure 7 Environment Menu..................................................

Figure 8 Display Menu ..........................................................

Figure 9 User Interface Settings Menus................................31

Figure 10 Changing the Shortcut Keys ...................................

Figure 11 Device Information Displays....................................

Figure 12 Other Settings Menu ...............................................

Figure 13 Selecting Analog Output .........................................

Figure 14 Recording Data .......................................................41

Figure 15 Location of the MI70 Connector Ports.....................45

Figure 16 Location of the Adjustment Button ..........................50

Figure 17 Field Check Adapter................................................52

Figure 18 Detaching the Probe ...............................................60

Figure 19 Installing the Battery Pack.......................................61

Figure 20 Dimensions .............................................................69

24
26
27
29

33
35
36
39

4 ______________________________________________________ M010139EN-D

___________________________________________________________________

List of Tables

Table 1 GMP221 and GMP222 Measuring Ranges ............14

Table 2 Error Messages Table ............................................ 57

Table 3 General Specifications............................................65

Table 4 Measuring Ranges ................................................. 66

Table 5 Accuracy Specifications..........................................66

Table 6 Other Specifications ............................................... 66

Table 7 General Specifications............................................67

Table 8 General Specifications............................................67

Table 9 Battery Pack Specifications .................................... 68

Table 10 Accessories Table ..................................................68

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6 ______________________________________________________ M010139EN-D

Chapter 1 ___________________________________________ General Information

CHAPTER 1

GENERAL INFORMATION

This chapter provides general notes for the product.

About This Manual

This manual provides information for installing, operating,
and maintaining Vaisala CARBOCAP
Dioxide Meter GM70.

Feedback

Vaisala Customer Documentation Team welcomes your
comments and suggestions on the quality and usefulness of
this publication. If you find errors or have other suggestions
for improvement, please indicate the chapter, section, and
page number. You can send comments to us by e-mail:

[e-mail]

®

Hand-Held Carbon

VAISALA __________________________________________________________ 7

User's Guide_________________________________________________________

Safety

General Safety Considerations

Throughout the manual, important safety considerations are

highlighted as follows:

CAUTION

NOTE

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 highlights important information on using the product.

Product Related Safety

Precautions

The Hand-Held Carbon Dioxide Meter GM70 delivered to

you has been tested for safety and approved as shipped from

the factory. Note the following precautions:

Do not modify the unit. Improper modification can damage

the product or lead to malfunction.

ESD Protection

Electrostatic Discharge (ESD) can cause immediate or latent

damage to electronic circuits. Vaisala products are

adequately protected against ESD for their intended use.

However, it is possible to damage the product by delivering

electrostatic discharges when touching, removing, or

inserting any objects inside the equipment housing.

To make sure you are not delivering high static voltages

yourself:

8 ______________________________________________________ M010139EN-D

Chapter 1 ___________________________________________ General Information

- Handle ESD sensitive components on a properly
grounded and protected ESD workbench. When this is
not possible, ground yourself to the equipment chassis
before touching the boards. Ground yourself with a wrist
strap and a resistive connection cord. When neither of the
above is possible, touch a conductive part of the
equipment chassis with your other hand before touching
the boards.

- Always hold the boards by the edges and avoid touching
the component contacts.

Recycling

Recycle all applicable material.

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

Trademarks

Vaisala CARBOCAP® is a registered trademark of Vaisala.
Microsoft®, Windows®, and Windows NT® are registered
trademarks of Microsoft Corporation in the United States

and/or other countries.

License Agreement

All rights to any software are held by Vaisala or third
parties. The customer is allowed to use the software only to
the extent that is provided by the applicable supply contract
or Software License Agreement.

VAISALA __________________________________________________________ 9

User's Guide_________________________________________________________

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 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 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 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 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.

10 _____________________________________________________ M010139EN-D

Chapter 2 _____________________________________________ Product Overview

CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the features, advantages, and the
product nomenclature.

Introduction to Vaisala CARBOCAP® Hand­Held Carbon Dioxide Meter GM70

The GM70 hand-held carbon dioxide meter measures
volume concentration of CO
the units of ppm or percentage %. The exceptional stability
and reliability performance of the GM70 comes from the
advanced silicon based Vaisala CARBOCAP

gas and displays the result in

2

®

sensor.

Basic Features of the GM70

- Both numerical and graphical displays

- Data logging possibility

- Tool for checking the reading of fixed CO

- Tool for adjusting Vaisala GM220 series probes

- Possibility for an analog output (voltage signal 0...1 V)

transmitters

2

- Optional ready-to-use Windows software enabling easy
way to handle measurement data

- Sampling methods: diffusion sampling (GMH-handle) or
pump aspirated sampling (GM70PUMP), alternatively

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User's Guide_________________________________________________________

Interchangeable Probes

By selecting the right probe you can choose the measuring
range that best fits for your application. The calibrated
measuring ranges varies from 0...2000 ppm to 0... 20%
concentrations of CO
details. For changing the measuring range you only have to
change the probe.

. Refer to Chapters 2 and 13 for more

2

Tool for Adjustments

For adjusting the GMT220 series transmitters the GM70
needs only the probes. GM70 adjusts and stores the
adjusting information to the nonvolatile memory of the
probes. This enables true interchangeability of the probes.

12 _____________________________________________________ M010139EN-D

Chapter 2 _____________________________________________ Product Overview

Parts Description

0505-221

Figure 1 GM70 Parts

The following numbers refer to

Figure 1 above:

1 = MI70 indicator

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User's Guide_________________________________________________________

2 = Recharger connector
3 = Connector ports I and II for probes and cables
4 = Probe GMP221 or GMP222
5 = Probe fastener
6 = Handle GMH70
7 = Adjustment button
8 = Gas outlet
9 = ON/OFF switch
10 = Gas inlet
11 = Measuring chamber
12 = Probe GMP221 or GMP222
13 = Probe connector
14 = Connector to MI70 indicator

Probes

Probes GMP221 and GMP222 can be used with the GM70.
Table 1 presents the measuring ranges that can be can be
selected for the probes.

Table 1 GMP221 and GMP222 Measuring Ranges

Probe Measuring Range

GMP221 0...2%, 0...3%, 0...5%,

0...10%, 0...20% CO2

GMP222 0...2000 ppm, 0...3000 ppm,

0...5000 ppm, 0...7000 ppm,

0...10000 ppm

In order to obtain the best possible performance, it is
recommended that the measurement range is chosen so that
the actual concentrations to be measured are roughly in the
middle of the measuring range.

14 _____________________________________________________ M010139EN-D

Chapter 2 _____________________________________________ Product Overview

GM70PUMP for Aspirated Sampling

GM70 Aspiration pump consists of a pump and a
measurement chamber for CO
is designed for checking of fixed CO
sampling from locations difficult to access. GM70PUMP is
connected to a MI70 indicator which displays the
measurement result. Pump system is powered through the
MI70 indicator.

measurements. GM70PUMP

2

transmitters and for

2

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16 _____________________________________________________ M010139EN-D

Chapter 3 ________________________________________Preparations Before Use

CHAPTER 3

PREPARATIONS BEFORE USE

Recharging the Batteries

1. If using alkalines, unscrew the back plate of the

indicator and insert the alkalines. If the GM70 is
ordered with a rechargeable battery pack, the battery
pack is already in place as shipped from the factory.

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

to the recharger connector 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 the GM70 during the
first recharging. Later on the GM70 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
to roll.

4. Disconnect the recharger.

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User's Guide_________________________________________________________

Turning On and Setting Language, Date, and Time

1. Connect the probe handle (or the connector from the
GM70PUMP) to either of the connector ports of the
indicator.

2. Press the

3. Select the language by using
pressing

4. The default date presentation format is:
change the date, select Date and press

the date by using the
the date, press
select

M/D/Y date format (month/date/year), press ON.

button.

buttons. Confirm by

SELECT.

date.month.year. To

SET. Change

buttons. To confirm

OK. If you want to change the format,

5. The default time presentation format is 24-hour clock.
To change the time, select Time and press

SET.
Change the time by using arrow buttons. To confirm
the time, press
select

12-hour clock, press ON.

6. Press
settings, select

EXIT. To check and change the environment

OK. If you want to use 12-hour clock,

YES. Otherwise select NO, basic display

appears.

7. To ensure the best possible accuracy set the actual
pressure and temperature values to the GM70 as
follows:

- Select the pressure setting (P: 1013 hPa, default),

press

UNIT to select unit (hPa or bar), press SET,

set the pressure value by using arrow buttons. Press

OK to save the value.

- Select the temperature setting (T: 25.0 C°, default),

press

UNIT to select unit (°C or °F), press SET, set

the temperature value by using arrow buttons. Press

+/- to change the sign of the value. Press OK to save

the value.

8. Press

18 _____________________________________________________ M010139EN-D

EXIT to return to the basic display.

Chapter 4 ______________________________________ Measuring Carbon Dioxide

CHAPTER 4

MEASURING CARBON DIOXIDE

The results of carbon dioxide measurements are affected by
the air pressure and the temperature of the measurement
conditions. For achieving the most accurate measurements
in high altitudes where the barometric pressure is clearly
lower than in the sea level, the actual atmospheric pressure
value should be set to the GM70. The acceptable pressure
value range is 700...1300 hPa.

NOTE

Before measurements ensure that the air pressure and
temperature settings are correct. Set the correct settings as
instructed on page

27.

Taking Measurements (Diffusion Sampling)

See Chapter 3 Preparations Before Use on page 17 if you
start the GM70 for the first time, otherwise follow the
instructions below:

1. Connect the probe cable to the MI70 indicator's

connector port.

2. Press

3. Wait for about 15 seconds to get the reading. For the

most accurate readings wait for 15 minutes to reach the
full operating state of the GM70.

POWER ON/OFF button.

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User's Guide_________________________________________________________

4. Install the probe to the measuring position. Avoid
exhaling near the probe as this increases the CO
concentration.

5. The basic display opens, allow the reading to stabilize.

2

CAUTION

Handle the probe carefully. Strong impact or falling can
damage the probe.

If you need to disconnect the probe, first press

ON/OFF

settings and data are saved properly.

button to turn the indicator OFF. This ensures that all

POWER

Taking Measurements (Pump Aspirated Sampling)

See Chapter 3 Preparations Before Use on page 17 if you
start the GM70 for the first time, otherwise follow the
instructions below:

1. Connect one end of the sampling tube to the gas inlet
(marked with IN), in case of using a tube.

2. Connect the black cable of the GM70PUMP to the
MI70 indicator's connector port.

3. Plug in the recharger connector of the MI70 and
connect the recharger to wall socket.

4. Connect the GM220 probe to the probe connector of
the GM70PUMP.

5. Insert the probe in the measuring chamber. Note that to
have a tight installation, the two O-rings on the
opening of the measuring chamber should not match
together with the filter edge or the tapes on the probe
(see figure). When operating the pump, especially
when taking a sample from hot and humid conditions
into room temperature, take care that no condensation
forms on the probe.

20 _____________________________________________________ M010139EN-D

Chapter 4 ______________________________________ Measuring Carbon Dioxide

6. Install the other end of the sampling tube to the

sampling location.

7. Turn on the MI70 indicator by pressing the

button.

8. Turn on the GM70PUMP.

9. The basic display opens.

10. Wait for a few minutes to get a stabilized reading. For

the most accurate readings wait for 15 minutes to reach
the full operating state of the GM70.

0505-222

NOTE

NOTE

NOTE

Figure 2 Properly Connecting the GM70PUMP

The following number refers to

Figure 2 above:

1 = Match the 2 O-rings together with the smooth probe

surface to have a tight connection!

Only one pump aspirated system can be connected to the
MI70 at a time.

When using the pump aspirated system it is recommended
to power the system by using the recharger connected to a
wall socket.

The battery indicator of the MI70 display does NOT show
the actual recharge level when the pump is in operation.

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User's Guide_________________________________________________________

Measuring Other Parameters Simultaneously

Connect Vaisala interchangeable dewpoint (DMP) or
humidity (HMP) probe to the MI70 indicator's other
connector port to have simultaneous humidity measurement.

1. Connect the DMP70/HMP70 probe to the other
connector port in the bottom of the indicator.

2. Turn on the MI70 device.

3. Check that the pressure settings of the probes (port I
and II) are the same if you are taking measurements
from the same condition. You can use the HMP70
probe's temperature data to compensate the CO
measurement. In this case, select

YES when the MI70

asks you to check the environmental settings. Then
select temperature

T and press SET. Now the MI70 asks

if you want to link the measured T value to
environment parameter, press

LINK and EXIT.

2

4. The display now shows the reading of the port I probe
in the upper row(s) and the reading of the port II probe
in the lower row(s).

5. For achieving the most accurate measurements, set the
actual temperature value measured with the
temperature and humidity probe to the GM70.

0505-223

Figure 3 Example of the Display when the Carbon

Dioxide, and the Temperature and Humidity
Probe are Connected Simultaneously to the
MI70 Indicator

22 _____________________________________________________ M010139EN-D

Chapter 5 ____________________________________Buttons, Displays, and Menus

CHAPTER 5

BUTTONS, DISPLAYS, AND MENUS

Buttons and Navigation

0505-224

Figure 4 MI70 Indicator Buttons

The following numbers refer to

1 = To open a menu view:

- Press an arrow button

- Press this shortcut button

2 = Shortcut buttons
3 = Arrow buttons
4 = Power ON/OFF

VAISALA _________________________________________________________ 23

Figure 4 above:

User's Guide_________________________________________________________

Basic Display

0505-225

Press down and hold the
the indicator turns on/off.
Press the
above the button.

Press any of the
for the

ARROW buttons.

SHORTCUT buttons (2) to activate the function

ARROW buttons (3) to open the path

MENUS. In the MENUS you can navigate with the

POWER ON/OFF button (1) until

Figure 5 Basic Display

1. Selected unit, ppm or %.

2. Shortcut button

Graphic

1

changes display into the

graphical trend 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 the battery.

6. Pressure and temperature settings.

7. Symbol which indicates that the GM70 is
communicating with a PC. If the PC cable is not
connected this symbol is not shown.

1

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

are set in the factory. You can however change them to refer
other functions (see

Changing the Shortcut Keys on page

33).

24 _____________________________________________________ M010139EN-D

Chapter 5 ____________________________________Buttons, Displays, and Menus

Graphical Display

The graphical display shows you the measurements in the
form of a curve. From the curve you can examine the data
trend and the history data of the last minutes.

Menus

1. In the basic display, press

open the

2. Graphical display opens. More information in section

Graphic History on page 31.

3. Press

In the menus you can change settings and select functions.

1. Open the main menu by pressing any of the

buttons.

2. Press

returns if you do not open the
happens, start with item 1 again.

3. Move in the menus by using

MENU, select ►Recording/Viewing).

BACK to return to the basic display.

OPEN within 5 seconds. The basic display

Graphic or (alternatively

MENU shortly. If this

buttons.

4. Select the item with

5. Press

EXIT returns back to normal operation.

6.

VAISALA _________________________________________________________ 25

to return to the previous level.

button.

User's Guide_________________________________________________________

0505-226

Figure 6 Menus

The following numbers refer to

Figure 6 above:

1 = Main menu
2 = Display menu
3 = Functions menu
4 = Recording/Viewing menu
5 = Environment menu
6 = Settings menu

26 _____________________________________________________ M010139EN-D

Chapter 6 _____________________________________________________ Settings

CHAPTER 6

SETTINGS

Setting Actual Pressure Value and Unit

For achieving the most accurate measurements in high
altitudes where the barometric pressure is clearly lower than
in the sea level, the actual atmospheric pressure value
should be set to the GM70. The acceptable pressure range is

700...1300 hPa. Pressure is given in the units of hPa or bar.

Follow the instructions below:

1. Open the

2. Select

3. Select pressure value, press

4. Set the pressure value by using

OK to save the value.

5. Press

hPa.

6. Press

0505-227

MENU, press OPEN.

►Environment with press .

UNIT , press SET.

UNIT to change the pressure unit. Default unit is

EXIT to return to the basic display.

buttons. Press

Figure 7 Environment Menu

VAISALA _________________________________________________________ 27

User's Guide_________________________________________________________

Setting Actual Temperature Value and Unit

For achieving the most accurate measurements, the actual
temperature value should be set to the GM70. The
acceptable temperature range is -20...60ºC.

Follow the instructions below:

1. Open the

2. Select

3. Select temperature value, press

4. Set the temperature value by using
Press

5. Press

MENU, press OPEN.

►Environment with press .

SET.

buttons.

OK to save the value.

UNIT to change the temperature unit. Default

unit is ºC.

6. Press

EXIT to return to the basic display.

If you are using the HMP75 or other humidity probe, the
temperature information can be linked to compensate the
GM70's CO

reading.

2

28 _____________________________________________________ M010139EN-D

Chapter 6 _____________________________________________________ Settings

Display Settings

0505-228

Figure 8 Display Menu

Display Units

The unit of the measurement can be selected between ppm
and %. The default unit is ppm for measuring ranges with
upper limit of 10 000 ppm or less. For measuring ranges
with upper limit of 2...20%, the default unit is %.

NOTE

1. Open the

2. Select

3. Select

4. To change the unit, press

5. Press

6. Press

settings, otherwise press

MENU, press OPEN.

►Display, press .

►Quantities and units, press .

UNIT (ppm or %)

EXIT to return to the basic display.

YES, if you want to check the environment

NO.

Measurement units (ppm and %) express the CO2
concentration by gas volume.

1% CO

= 10 000 ppm CO2

2

VAISALA _________________________________________________________ 29

User's Guide_________________________________________________________

Rounding

When using % units, you can select two or three decimal
display by using the Rounding function. The default setting
is rounding off (= three decimal display).

1. Open the

2. Select

3. Select

4. Press
Press

MENU, press OPEN.

►Display, press .

Rounding.

ON to have rounding on (two decimal display).
OFF to deactivate rounding (three decimal

display).

5. Press

EXIT to return to the basic display.

Hold/Save Display

Hold/Save function enables you to freeze a certain display

reading. This reading can be saved into the memory.

1. Open the

MENU, press OPEN.

2. Select

3. Select

4. Press

►Display, press .

Hold/Save display.

HOLD to freeze the display. The frozen

measurement data is displayed.

5. Press

SAVE to save the reading and EXIT to return to

the basic display.

6. You can save several readings with

HOLD-SAVE function.

The first saved reading is data point 1, the second
saved reading is data point 2 etc. All the individual
readings (data points) are stored in the same file
marked with

. The file remains in the indicator

memory even if the indicator is switched OFF.

30 _____________________________________________________ M010139EN-D

Chapter 6 _____________________________________________________ Settings

7. To view the saved readings, press ►Record, select

►View recorded data, press .

8. Select the file marked with

see the saved data readings. Press

, press . Now you can

TIMES to see the

recording timestamps.

9. Press

EXIT to return to the basic display.

Graphic History

Graphic history shows you the data curve from the time the
device was turned on.

1. Open the

2. Select

3. Select

history display.

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

maximum and mean values), press

MENU, press OPEN.

►Display, press .

Graphic history, press SHOW to have a graphical

INFO.

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

NEXT until text ALL is shown, press ALL.

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

zoom out, press the button
horizontal directions, press the buttons

7. Press

User Interface

0505-229

Figure 9 User Interface Settings Menus

NEXT. To get the curves of all the quantities, press

. To

. To move the curve in

.

BACK and EXIT to return to the basic display.

VAISALA _________________________________________________________ 31

User's Guide_________________________________________________________

Selecting Language

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

1. Open the

2. Select

3. Select

4. Select

5. Select the language you want, press

6. Press

MENU, press OPEN.

►Settings, press .

►User interface, press .

Language, press SET.

SELECT.

EXIT to return to the basic display.

If you accidentally select a wrong language, first go back to
the basic display by pressing

(right) as many times as
required, then go to the language selection menu by
pressing:

, (middle) , , , (middle).

Automatic Power Off

As shipped from the factory, the GM70 has a default setting
which turns the power off automatically after 15 minutes of
inactivity. This is to save 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
below:

1. Open the

2. Select

3. Select

4. Select

5. Select the choice you want, press

6. Press

32 _____________________________________________________ M010139EN-D

MENU, press OPEN.

►Settings, press .

►User interface, press .

Auto power off, press SET.

SELECT.

EXIT to return to the basic display.

Chapter 6 _____________________________________________________ Settings

Changing the Shortcut Keys

By default the three shortcut keys refer to the functions
Graphic, Hold/Save and Record. However the shortcut keys
for the functions can be changed to meet your needs.

1. Open the

2. Select

3. Select

4. Select

MENU, press OPEN.

►Settings, press .

►User interface, press .

Program shortcut keys, press START.

5. Press the shortcut key you want to change, for
example:

6. If you want to replace

Hold/Save.

Hold/Save with pressure setting

function, select pressure setting by using arrow
buttons,
confirm your selection, otherwise answer

►Environment→P, press SELECT. Answer YES to

NO and

continue from item 4.

7. Press

EXIT to return to the basic display.

0505-230

Figure 10 Changing the Shortcut Keys

The following number refers to

1 =

Hold/Save-shortcut key replaced by pressure setting

shortcut key

P

Figure 10 above:

VAISALA _________________________________________________________ 33

User's Guide_________________________________________________________

Key Click and Backlight On Key Press

1. Open the MENU, press OPEN.

2. Select

3. Select

►Settings, press .

►User interface, press .

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

Key click and press ON/OFF.

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

6. Press

EXIT to return to the basic display.

Backlight on key press ON/OFF.

Setting Date and Time

1. Open the MENU, press OPEN.

2. Select

3. Select

4. The default date presentation format is year-month-
date. For example 2002-02-01. To change the date,
select
arrow buttons. To confirm the date, press.
want to change the format, select
(date.month.year) or
(month/day/year), press

►Settings, press .

►Date and time, press .

Date and press SET. Change the date by using

OK. If you

D.M.Y

M/D/Y date format

ON/OFF.

5. The default time presentation format is 24-hour clock.
To change the time, select

Time and press SET. Change

the time by using arrow buttons. To confirm the time,
press
hour clock, press

6. Press

34 _____________________________________________________ M010139EN-D

OK. If you want to change the format, select 12-

ON/OFF.

EXIT.

Chapter 6 _____________________________________________________ Settings

Device Information

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

1. Open the

2. Select

3. Select

MENU, press OPEN.

►Settings, press .

►Device information, press SHOW.

4. The first display gives the information on the MI70

indicator. Press
probe. Press

MORE to get the information on the

OK and EXIT to return to the basic

display.

0505-231

Figure 11 Device Information Displays

The following numbers refer to

Figure 11 above:

1 = Software version of the MI70 indicator
2 = Serial number of the MI70 indicator
3 = Software version of the probe
4 = Location of the last adjustment (alternatives:

Vaisala, GM70, or GMK220)

VAISALA _________________________________________________________ 35

User's Guide_________________________________________________________

Reverting Factory Settings

Factory settings of the indicator only can be reverted to
clear all changed settings and data memory of the indicator.
Reverting factory settings of the indicator does not affect the
probe calibration. Factory calibration of the probe cannot be
reverted if adjustment is made (see

and Adjusting the Probes on page

Chapter 10 Calibrating

49).

1. Open the

2. Select

3. Select
confirm the reverting.

4. The power turns off automatically. When switching on
again, the factory settings are reverted. You need to set
the language, date, and time again. See

Other Settings

0505-232

MENU, press OPEN.

►Settings, press .

Factory settings, press REVERT. Press YES to

Chapter 3.

Figure 12 Other Settings Menu

Setting the Alarm Levels

Two alarm levels can be set. Alarming state is OFF in
between the set points. Alarming state is ON when CO
concentration is below level 1 or above alarm level 2. For
example, if you want to set ON the alarm when
concentration exceeds 1000 ppm, set the first level as 0 ppm
and the second level as 1000 ppm. When alarming is ON,
GM70 starts to beep and display backlight starts to blink.

36 _____________________________________________________ M010139EN-D

2

Chapter 6 _____________________________________________________ Settings

1. Open the MENU, press OPEN.

2. Select

3. Select

4. Select the first limit, press

►Settings, press .

►Alarm, press .

(if the alarm function is
ON, take it OFF). Set the alarm level by using arrow
buttons. Press

OK to save the setting.

5. If needed, select the second limit, and then follow
instructions from item 6. The alarm will go off when
the upper limit is exceeded or when lower limit is gone
below.

6. Select

Alarm ON/OFF, press ON to activate the alarm and

return back to the basic display.

7. A note picture sign

appears on the upper left corner

of the basic display.

8. When the alarm level is reached, you can stop alarming
by pressing
answer
answer

OK. To reactivate the alarm function,
YES. To stop the alarm function completely,
NO.

VAISALA _________________________________________________________ 37

User's Guide_________________________________________________________

This page intentionally left blank.

38 _____________________________________________________ M010139EN-D

Chapter 7 ______________________________________ Analog Output Connection

CHAPTER 7

ANALOG OUTPUT CONNECTION

Selecting and Scaling the Analog Output

0505-233

Figure 13 Selecting Analog Output

To get analog measurement data you need an analog output
signal cable, see list of accessories on page
voltage signal channel 0...1.0V is available. You can scale
the output to any output range but it is recommended to
have the scaling within the probe's measuring range to get
accurate measurements.

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.

68. One scalable

3. Select

VAISALA _________________________________________________________ 39

►Functions, press .

User's Guide_________________________________________________________

4. Select ►Analog output, press .

5. Select
press

0.0 V to set the value for the 0.0V output signal,

SET (If the analog output is ON, take it OFF).

Set the low value by using the arrow buttons. Press

OK to make the setting.

6. Select
press
buttons. Press
value. Press

7. Select

1.0V to set the value for the 1.0V output signal,

SET. Set the high value by using the arrow

+/- button to choose the sign of the

OK to make the setting.

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

output and return back to the basic display.

8. A wire picture sign

appears on the upper left corner

of the basic display.

9. To deactivate the analog output function, go to

►Functions ►Analog output ►Analog output on/off

and press OFF.

MENU

40 _____________________________________________________ M010139EN-D

Chapter 8 _______________________________________________ Recording Data

CHAPTER 8

RECORDING DATA

Recording

0505-234

Figure 14 Recording Data

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

1. Press the shortcut

MENU, select ►Recording/Viewing).

2. Select

3. To change interval, select

4. Select the measurement interval with the arrow

buttons. The measurement intervals and the maximum
recording times are shown in the following table.

►Record data, press .

►Record, (alternatively open the

Interval, press SET.

VAISALA _________________________________________________________ 41

User's Guide_________________________________________________________

Measurement interval Maximum recording

duration (= memory full)

1 second 45 minutes
5 seconds 3 hours
15 seconds 11 hours
30 seconds 22 hours
1 minute 45 hours
5 minutes 9 days
15 minutes 28 days
30 minutes 56 days
1 hour 113 days
3 hours 339 days
12 hours 1359 days

5. Press SELECT.

6. To set the recording duration, select

Duration, press SET.

7. Select the recording duration with the arrow buttons
and press

8. Start recording: select Start/Stop recording, press

START. If you choose 'Memory full', you see the

SELECT.

maximum recording time on the display. You can also
delete files to free memory. Press

START again to

accept maximum recording time.

9. It is recommended to have power on during recording
to get the most accurate measurements. In long lasting
recordings, power the GM70 via the charging adapter.
Ensure that the automatic power off function is
deactivated. In battery use, you can switch off power
during recording to save battery, but then the accuracy
is not necessarily within accuracy specifications. A
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
the charging adapter is connected).

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.

42 _____________________________________________________ M010139EN-D

Chapter 8 _______________________________________________ Recording Data

Stop Recording

1. To stop recording, press shortcut ►Record, select

►Record data and press , select Start/Stop recording and press

STOP.

2. Now you can go and view the recorded file by

selecting

SHOW.

You can save individual measurement data points with

Hold/Save function described in page 30.

Viewing Recorded Data

1. Open the MENU, press OPEN.

2. Select

3. Select

►Recording/Viewing, press .

►View recorded data, press .

4. Select the file you want to view, press

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
to the recording values).

6. Press

EXIT to return to the basic display.

Checking Memory Status

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

1. Open the

2. Select

MENU, press OPEN.

►Recording/Viewing, press .

. The files are

VALUES to go back

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

VAISALA _________________________________________________________ 43

OK and EXIT.

User's Guide_________________________________________________________

Deleting All Recorded Files

The data memory can be cleared as follows:

1. Open the

2. Select

3. Select
confirm deletion of all recorded data files.

4. To return to the basic display, press

MENU, press OPEN.

►Recording/Viewing, press .

Clear data memory, press CLEAR. Press YES to

Transferring Recorded Data to PC

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

The MI70 Link program can be ordered from Vaisala, see
list of accessories on page
recorded data easily in Windows™ environment and further
transfer it into a spreadsheet program (such as Microsoft
Excel) for modification.

68. You can examine the

EXIT.

®

Real-Time Monitoring with PC

You can monitor the GM70 readings directly with a PC by
using the MI70 Link program. The MI70 Link program can
be ordered from Vaisala, see list of accessories on page

68.

44 _____________________________________________________ M010139EN-D

Chapter 9 ______________________________ Field Checking of Fixed Transmitters

CHAPTER 9

FIELD CHECKING OF FIXED TRANSMITTERS

Field Checking of the Vaisala GMD/W20 Series Transmitters (Diffusion Sampling)

0505-235

Figure 15 Location of the MI70 Connector Ports

The following number refers to Figure 15 above:

1 = Connectors for the GMA70 cable

VAISALA _________________________________________________________ 45

User's Guide_________________________________________________________

Check the reading of a fixed transmitter by using the GM70
as a reference. Both readings can be seen on the GM70's
display simultaneously when using a connecting cable
GMA70 (see the list of accessories).

1. Connect the end of the GMA70-cable to either of the
GM70's connector ports located on the bottom of the
indicator.

2. Connect the other end of the GMA70-cable to the

SERIAL COM pin connector of the GM20 transmitter's

motherboard.

3. Turn on the MI70 indicator.

4. Set the GM70 probe next to the transmitter to be
checked. Ensure that the probes are located in the same
conditions. Avoid exhaling towards the probe as this
alters the CO

concentration and disturbs the readings.

2

5. The reading of the transmitter is shown on the first or
middle row of the display, depending on which
connector is used. Value of connector I is shown on the
upper row of the display. Value of connector II is on
the lower row of the display. The difference of the
readings is shown on the lowest row.

6. Compare the readings. In case there is a need for an
adjustment, send the transmitter to a Vaisala Service
Center to be adjusted or make an adjustment by using a
calibration software kit (19222GM).

Field Checking of the Vaisala GMD/W20 Series Transmitters (Pump Aspirated Sampling)

The pump aspirated system feeds the same gas sample to
both the reference probe and the transmitter to be checked.
Both readings can be seen on the GM70's display
simultaneously when using a connecting cable GMA70 (see
the list of accessories).

46 _____________________________________________________ M010139EN-D

Chapter 9 ______________________________ Field Checking of Fixed Transmitters

1. Connect the GMA70 cable between the MI70

indicator's connector port and the

SERIAL COM pins in the

motherboard of the GM20 transmitter. If not using the
GMA70 cable, check the transmitter reading from the
transmitter output.

2. Connect one end of the sampling tube to the gas inlet

(marked with IN) of the GM70PUMP.

3. Connect the other end of the tube.

4. GMD20: to the sampling port located in the middle of

the GMD20's motherboard (protected with a yellow
cap).

5. GMW20: to the sampling port located on the

GMW20's motherboard (protected with a yellow cap).

6. Insert the calibrated GM220 probe to the measuring

chamber of the GM70PUMP.

NOTE

7. Turn on the MI70 indicator and the GM70PUMP.

8. Compare the readings. In case there is need for an

adjustment, send the transmitter to a Vaisala Service
Center to be adjusted or make an adjustment by using a
calibration software kit (19222GM).

Please do not breathe towards the transmitter when
checking the readings.

VAISALA _________________________________________________________ 47

User's Guide_________________________________________________________

Field Checking of the GMT220 (Without a Display)

Follow the instructions below to check the operation of a
GM220 series probe.

1. Check the display reading of the GM70.

2. Turn off the GM70.

3. Detach the GM70's probe as follows:

- Loosen the plastic probe fastener (item 7, Figure 1)

by unscrewing it about 5 turns.

- Take a firm hold from the base of the probe and pull

strongly until the probe comes loose.

4. Detach the GM220 probe from the transmitter base
(open the cover, loosen the tightening screw and pull
the probe out).

5. Insert the GM220 probe to the GM70 handle as deep as
possible. Turn the probe inside the handle until you
feel that a step in the probe connector snaps into the
groove of the probe handle connector and locks the
probe.

6. Tighten the probe fastener.

7. Turn on the GM70.

8. Compare the readings of the GM70 and the transmitter
probe to be checked.

9. If there is need for an adjustment, please contact
Vaisala Service Center or adjust the probe according to
the instructions in

Adjusting the Probes on page

Chapter 10 Calibrating and

49.

You can also connect the GMA70 cable between the
GMT220 and the GM70 as described in the previous
section.

48 _____________________________________________________ M010139EN-D

Chapter 10 _____________________________ Calibrating and Adjusting the Probes

CHAPTER 10

CALIBRATING AND ADJUSTING THE PROBES

In this user's guide the term calibration means comparing
detector's reading to a reference concentration. In adjusting,
which is usually done after calibration, the reading of the
detector is changed to correspond to the reference
concentration.

After adjustment, the original calibration certificate shipped
with the product is not valid anymore.

Calibration Interval

The GM70 is fully calibrated and adjusted as shipped from
factory. The recommended calibration interval is two years.
However, calibration should always be done whenever there
is reason to believe that the device is not within the accuracy
specifications. The length of the suitable calibration interval
may vary depending on the conditions and frequency of use.

Factory Calibration and Adjustment

It is recommended to send the GM70 probe to Vaisala
Service Centers for accurate calibration and adjustment, see
contact information on page

63.

VAISALA _________________________________________________________ 49

User's Guide_________________________________________________________

Calibration and Adjustment by the User

The GM70 can be calibrated and fine control adjustment can
be carried out by the user. Note that this adjustment does not
correspond to the accurate factory adjustment. The user
adjustment is recommended only if the reading error is less
than 10% of the measuring range in the low-end and less
than 20% of the measuring range in the high-end. The
calibration report supplied with the product is not valid after
the adjustment.

CAUTION

NOTE

You cannot revert to factory settings after the user
adjustment!

Adjustment is carried out

- by using reference gases and a field check adapter,

- by comparing two probes: the one to be adjusted and the

other a calibrated probe.

Adjustment cannot be done with the GM70PUMP.

To open the adjustment mode you need to press the
adjustment button (
The GMH handle does not meet the IP65 classification
requirements after removal of the screw that covers the
adjustment button.

Figure 16) located in the probe handle.

0505-236

Figure 16 Location of the Adjustment Button

50 _____________________________________________________ M010139EN-D

Chapter 10 _____________________________ Calibrating and Adjusting the Probes

The following number refers to Figure 16 on page 50:

1 = Adjustment button (before adjusting, take out the

screw which covers the button).

Adjustment with Reference Gases

Equipment Needed

For the adjustment procedure with gases, you need the
probe to be adjusted, accurate reference gas(es), a pressure
regulator, a flow meter, a field check adapter (can be
ordered from Vaisala) and flexible tubing with 3 mm (1/8")
inner diameter.

Reference Gases

NOTE

To achieve reliable results reference gases shall be traceable
to appropriate standards (for example NIST).

- If adjustment is done by using one reference gas (one-

point adjustment), concentration of the gas should be near
to the concentration values in which the device is used.

It must be noted that when adjustment is done only in one
point, this results high accuracy only near to the adjustment
point, not necessarily over the whole measurement range.

- When using two reference gases (two-point adjustment),

the reference gas concentrations should represent the low­end and the high-end of the measuring range. The low­end concentration should be less than 20% of the
measuring range of the probe. The zero gas can be N
with a purity of N5.0 (or better). The high-end gas can be
mixture of CO
upper limit of the measuring range, being 110% of the
range at maximum. Accuracy of the concentrations
should be 1% (or better). Difference between the
reference gas concentrations should be more than 20% of
the measuring range.

and N2 with concentration near to the

2

gas

2

VAISALA _________________________________________________________ 51

User's Guide_________________________________________________________

Two-Point Adjustment Procedure

CAUTION

Please take special care regarding the following when
carrying out the adjustment:

- Check that you give the correct reference concentrations

in the correct units.

- Check that the reading has really stabilized before

accepting the reading.

You cannot revert the factory settings after the adjustment!

1. Insert the probe into the field check adapter until the
perforated filter is covered.

0505-237

Figure 17 Field Check Adapter

2. Connect the tubing to the bottom port of the adapter.

3. Connect the adapter with the tubing to the flow meter,
the pressure regulator and further to the low-end
reference gas bottle. The side port of the adapter is left
open for gas outflow.

4. Let the low end reference gas flow and stabilize with a
flow rate of about 0.6 l/min. Follow the reading of
GM70, and after it has stabilized, wait for 6 more
minutes.

5. Take out the screw from the GM70 probe handle to
expose the adjustment button (see
Press the button with a small screwdriver. When

52 _____________________________________________________ M010139EN-D

Figure 16, page 50).

Chapter 10 _____________________________ Calibrating and Adjusting the Probes

pressing the button, the indicator turns to adjusting
mode.

6. Press

7. Select

8. Press

temperature values. To continue adjusting press

9. Now the adjustment mode is on. Press

OK to confirm the adjusting.

CO2, press SELECT.

YES to give the ambient pressure and

EXIT.

GRAPH to
confirm that the readings have stabilized. Go back and
press

10. Select

ADJUST to select the adjustment method.

2-point adjustment, press SELECT. Press READY with

the stabilized reading in the lower reference
concentration.

11. Give the lower reference concentration value by using
the arrow buttons (for example, if you are using pure
nitrogen, enter value 0 ppm). Take care that you give
the correct value in correct units, as you cannot revert
the earlier values after accepting the new values. Press

OK.

Next move on to the adjustment at the second (high­end) reference point.

12. Take out the tubing from the low-end gas bottle and
connect it to the high-end gas bottle.

13. Let the high end reference gas flow and stabilize with a
flow rate of 0.6 l/min. Follow the reading of GM70,
and after it has stabilized, wait for 6 more minutes.

14. Press

READY with the stabilized reading in the higher

reference concentration.

15. Give the high-end reference concentration value by
using the arrow buttons. The analyzed CO

2

concentration of the reference gas is typically printed
on the bottle.

Take care that you give the correct value in correct
units, as you cannot revert the earlier values after
accepting the new values. Press

OK.

VAISALA _________________________________________________________ 53

User's Guide_________________________________________________________

16. Confirm the adjustment, press YES. By pressing NO
you return to adjustment mode display. (If the
difference between the two references is less than 20%
of the measuring range of the probe, adjustment cannot
be done).

CAUTION

17. Adjustment is complete. Press
the basic display.

18. Shut off the gas flow.

19. Replace the screw onto the adjusting button.

BACK-EXIT to return to

One-Point Adjustment Procedure

Please take special care regarding the following when
carrying out the adjustment:

- Check that you give the correct reference concentrations

in the correct units.

- Check that the reading has really stabilized before

accepting the reading.

You cannot revert the factory settings after the adjustment!

1. Insert the probe into the field check adapter (as deep as
possible, the perforated filter cover should be
completely inside the adapter).

2. Connect the tubing to the bottom port of the adapter.

3. Connect the adapter with the tubing to the flow meter,
the pressure regulator and further to the reference gas
bottle. The side port of the adapter is left open for gas
outflow.

4. Let the reference gas flow and stabilize with a flow rate
of 0.6 l/min. Follow the reading of GM70, and after it
has stabilized, wait for 6 more minutes.

54 _____________________________________________________ M010139EN-D

Chapter 10 _____________________________ Calibrating and Adjusting the Probes

5. Take out the screw from the GM70 probe handle to

expose the adjustment button (see

Figure 16, page 50).
Press the button with a small screwdriver. When
pressing the button, the indicator turns to adjusting
mode.

6. Press

7. Select

8. Press
temperature values. To continue adjusting press

9. Now the adjustment mode is on. Press

OK to confirm the adjusting.

CO2, press SELECT.

YES to give the ambient pressure and

EXIT.

GRAPH to see

when the readings have stabilized. Go back and press

ADJUST to select the adjustment method.

10. Select

1-point adjustment, press SELECT. Press READY if

the value has stabilized.

11. Give the reference concentration value by using the
arrow buttons.

Examples: For a zero-point adjustment using pure
nitrogen (N

For other reference gases, the analyzed CO

) enter value 0 ppm.

2

2

concentration is typically printed on the bottle. Use that
value.

Take care that you give the correct value in correct
unit, you cannot revert the earlier values after
accepting the new values. Press

12. Confirm the adjustment, press

OK.

YES. By pressing NO

you return to adjustment mode display.

13. Adjustment is complete. Press

BACK-EXIT to return to

the basic display.

14. Shut off the gas flow.

15. Replace the screw onto the adjusting button.

VAISALA _________________________________________________________ 55

User's Guide_________________________________________________________

Adjustment with Two Probes

You need to have two probe handles and two probes: one
calibrated probe and the probe to be adjusted. It is
recommended to carry out the adjustment in a stable
environment and near the concentration values in which the
device is used.

Connect the probes to connectors I and II in the bottom of
the indicator.

1. Turn on the GM70.

2. Take the probe you want to adjust. Unscrew the probe
handle screw to expose the adjustment button (see
Figure 16, page 50). Press the button with a small
screwdriver. When pressing the button, indicator turns
to adjusting mode.

3. Select

4. Press

CO2, press SELECT.

YES to give the ambient pressure and
temperature values. Remember to check that pressure
and temperature values are the same with both probes.
To continue adjusting press

5. Now the adjustment mode is on. Press

EXIT.

GRAPH to see

when the readings have stabilized. Go back and press

ADJUST to select the adjustment method.

6. Select

7. Adjustment is complete. Press

To same as CO2, press SELECT and YES.

BACK-EXIT to return to

the basic display.

8. Replace the screw onto the adjusting button.

56 _____________________________________________________ M010139EN-D

Chapter 11 ______________________________________________ Error Messages

CHAPTER 11

ERROR MESSAGES

Table 2 Error Messages Table

Error Message Interpretation and Action
Difference too

big

Value too high

Lower value too
high

Higher value
too high

Values too
close

Probe error:
Reboot

The adjustment cannot be made if the difference between the
measured concentration and the given value is more than 20% of
the maximum value of the probe's measuring range. This
message can be caused by a considerable high drifting error of
the probe.

Please, contact Vaisala or send the probe to Vaisala Service, see
page 63.
The reference concentration can be at the highest 110% of the
maximum value of the probe's measuring range.

Make the adjustment by using lower reference gas concentration.
The lower reference gas concentration shall be less than 20% of
the maximum value of the probe's measuring range.

Make the adjustment by using lower reference gas concentration.
The higher reference gas concentration shall be at highest 110%
of the maximum value of the probe's measuring range.

Make the adjustment by using lower reference gas concentration.
The difference between the reference concentrations shall be at
minimum 20% of the maximum value of the probe's measuring
range.

Make the adjustment by using correct reference gas
concentrations, see above.
This error can occur when changing the probe while power is on.
Switch off power and connect the probe properly. Switch on
power.

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Error Message Interpretation and Action
Probe error

Adapter error

This error can occur when changing the probe while power is on.
Switch off power and check that the probe is connected properly:
unscrew the probe fastener. Insert the probe to the handle as
deep as possible. Turn the probe inside the handle until you feel
that a step in the probe connector snaps into the groove of the
handle connector and locks the probe. Tighten the probe
fastener. Switch on power.
Switch off power and check that the probe is connected properly,
see the instructions of Probe error. In case of continuous error,
contact Vaisala or send the probe to Vaisala Service, see page

63.

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Chapter 12 ________________________________________________ Maintenance

CHAPTER 12

MAINTENANCE

Changing the Probe

1. Turn off the GM70.

2. Detach the probe as follows (see

60):

- Loosen the plastic probe fastener by unscrewing it
about 5 turns.

- Take a firm hold from the base of the probe and pull
strongly until the probe comes loose.

3. Insert a new probe to the handle as deep as possible.
Turn the probe inside the handle until you feel that a
step in the probe connector snaps into the groove of the
probe handle connector and locks the probe.

4. Tighten the probe fastener.

5. Turn on the GM70.

Figure 18 on page

VAISALA _________________________________________________________ 59

User's Guide_________________________________________________________

0505-238

Figure 18 Detaching the Probe

The following refers to

1 = Unscrew the probe fastener (about 5 turns).
2 = Pull the probe out firmly.

Figure 18 above:

Changing the Probe Filter

Spare filters for the probe can be ordered from Vaisala, see
list of accessories on page

1. Remove the plastic grid by pulling it out.

2. Remove the filter paper.

3. Insert a new filter paper and plastic grid.

68.

Cleaning

Wipe the plastic parts of the device with a damp paper or
towel. Mild washing agents can be used. Do not let water
flow down to electronics through the buttonholes.

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Chapter 12 ________________________________________________ Maintenance

Changing the Battery Pack

New rechargeable battery packs 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 4 (red and black wires are on the upper edge
of the connector). Do not push the connector with
conducting material

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

5. Charge the battery pack before use, see page

17.

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

0505-239

Figure 19 Installing the Battery Pack

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User's Guide_________________________________________________________

Technical Support

For technical questions, contact the Vaisala technical
support:

E-mail

Phone (int.) [phone]

Fax [phone]

[e-mail]

Return Instructions

If the product needs repair, please follow the instructions
below to speed up the process and avoid extra costs.

1. Read the warranty information.

2. Write a Problem Report with the name and contact
information of a technically competent person who can
provide further information on the problem.

3. On the Problem Report, please explain:

- What failed (what worked / did not work)?

- Where did it fail (location and environment)?

- When did it fail (date, immediately / after a while /

periodically / randomly)?

- How many failed (only one defect / other same or

similar defects / several failures in one unit)?

- What was connected to the product and to which

connectors?

- Input power source type, voltage and list of other

items (lighting, heaters, motors etc.) that were
connected to the same power output.

- What was done when the failure was noticed?

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Chapter 12 ________________________________________________ Maintenance

4. Include a detailed return address with your preferred

shipping method on the Problem Report.

5. Pack the faulty product using an ESD protection bag of

good quality with proper cushioning material in a
strong box of adequate size. Please include the
Problem Report in the same box.

6. Send the box to:

Vaisala Oyj
Contact person / Division
Vanha Nurmijärventie 21
FIN-01670 Vantaa
Finland

or to the addresses

Vaisala Service Centers

below:

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Chapter 13 _______________________________________ Technical Specifications

CHAPTER 13

TECHNICAL SPECIFICATIONS

GM70 Hand-Held Carbon Dioxide Meter

General

Table 3 General Specifications

Property Description / Value

Storage temperature -30...+70°C
Storage humidity
range

0...100%RH non-condensing

Electromagnetic Compatibility

Complies with the following standard:

EN61326-1:1997+ Am1:1998 + Am2:2001, Electrical
equipment for measurement, control and laboratory use ­EMC requirements; Generic environment.

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GMP221/222 Probes

Table 4 Measuring Ranges

Probe Measuring Ranges

GMP221 0...2%, 0...3%, 0...5%, 0...10%,

0...20%

GMP222 0...2000 ppm, 0...3000 ppm, 0...5000

ppm, 0...7000 ppm, 0...10000 ppm

Table 5 Accuracy Specifications

Accuracy at 25°C against certified factory references
(including repeatability and calibration uncertainty)

Probe Accuracy

GMP221

Accuracy specification applies for
CO

concentrations above 2% of

2

FS

GMP222 <±[20 ppm CO2 + 2% of reading]

Property Description / Value

Nonlinearity <±1%FS
Temperature
dependence
Pressure dependence 0.15% of reading/hPa (reference 1013

Long-term instability <±5%FS / 2 years
Response time (63%) 20 seconds (GMP221)

<±[0.02% CO2 + 2% of reading]

0.1%FS/°C (reference 25ºC/77ºF)

hPa)

30 seconds (GMP222)

Table 6 Other Specifications

Property Description / Value

Warm-up time

with GM70PUMP
Operation temperature -20...+ 60ºC
Operation pressure 700...1300 hPa
Operation humidity 0...100%RH non-condensing
Probe material PC
Probe cable length 1.9 m

30 seconds
15 min full specification
30 min full specification

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Chapter 13 _______________________________________ Technical Specifications

GMH70 Handle, GM70PUMP

Table 7 General Specifications

Property Description / Value
GMH70 Handle

GMH70 handle
material
Probe fastener Aluminium

GM70PUMP

Pump housing Anodized aluminium/IP54
Pump 0...18 mbar differential pressure
Weight 0.7 kg

ABS/PC-blend

MI70 Indicator

Indicator General

Table 8 General Specifications

Property Description / Value

Operating temperature
range
Operating humidity
change
Menu languages English, German, French, Finnish,

Display LCD with backlight

Probe inputs 1 or 2
Power supply Rechargeable NIMH battery pack with

Analog output 0...1 VDC
Output resolution 0.6 mV
Accuracy 0.2% full scale
Temperature
dependence
Minimum load resistor 10 kohm to ground
Data interface RS232C
Data logging capacity 900...2700 real time data points
Logging interval 1 s to 12 h
Alarm Audible alarm function
Housing classification IP54
Weight 400 g
Housing material ABS/PC-blend

-10...+ 40ºC

0...100%RH non-condensing

Spanish and Swedish

Graphic trend display of any quantity
Character height up to 16mm

AC-POWER or 4 x AA size alkalines,
type IEC LR6

0.002%/°C full scale

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Battery Pack

Table 9 Battery Pack Specifications

Property Description / Value

Operation times
continuous use (one
probe)
data logging use (one
probe)
when pump is on

Power consumption
during charge
Charging time 4 hour typical

8 h typical at +20°C

up to 30 days (1-hour measurement
interval)

5 h typical
10 W max

Accessories

Table 10 Accessories Table

Description Order Code

Euro AC-adapter MI70EUROADAPTER
UK AC-adapter MI70UKADAPTER
US AC-adapter MI70USADAPTER
AUS AC-adapter MI70AUSADAPTER
Measurement indicator
(battery pack included)
MI70 Link- software interface
kit
Analog output signal cable 27168ZZ
Connection cable for GM20­series
Carrying case MI70CASE
Spare probe (use the order
form to define measurement
range)
Aspiration pump GM70PUMP
Handle GMH70
Spare filter for GMP221 25378GMSP
Spare filter for GMP222 25879GMSP
Field check adapter 26150GM

MI70

MI70LINK

GMA70

GMP221, GMP222

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Chapter 13 _______________________________________ Technical Specifications

Dimensions in mm (inch)

0505-240

Figure 20 Dimensions

VAISALA _________________________________________________________ 69

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