Vaisala CARBOCAP GM70 User manual

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About this document
Version information
This document provides detailed instructions for installing, operating, and maintaining Vaisala CARBOCAP® Handheld
Carbon Dioxide Meter GM70.
Table 1. Document versions (English)
Document code Date Description
M010139EN-H April 2021
This manual. Document template and content organization update. Added
information about MI70 battery and device status icons and the calibration
reminder setting. Updated information about data transfer with MI70 Link and
stabilization time in adjustment instructions. Specifications and spare part
information updated. Removed references to discontinued products GMT220,
GMM220, GMK220, GMW115, and GMW20.
M010139EN-G April 2012 Previous version. New error codes added. General updates implemented.
Related manuals
Table 1. Related manuals
Document code Name
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M210514EN Vaisala CARBOCAP® Carbon Dioxide Probe GMP343 User's Guide
M211501EN Vaisala CARBOCAP® Carbon Dioxide Probe GMP231 User Guide
M211659EN Vaisala CARBOCAP® Carbon Dioxide, Temperature, and Humidity Transmitter Series GMW90
User's Guide
M211799EN Vaisala CARBOCAP® Carbon Dioxide Probe GMP251 User Guide
M211897EN Vaisala CARBOCAP® Carbon Dioxide Probe GMP252 User Guide
Documentation conventions
WARNING! Warning alerts you to a serious hazard. If you do not read and follow instructions carefully at
this point, there is a risk of injury or even death.
CAUTION! Caution warns you of a potential hazard. If you do not read and follow instructions carefully at
this point, the product could be damaged or important data could be lost.
Note highlights important information on using the product.
Tip gives information for using the product more efficiently.

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Lists tools needed to perform the task.
Indicates that you need to take some notes during the task.
Trademarks
Vaisala® and CARBOCAP® are registered trademarks of Vaisala Oyj.
Windows® is either a registered trademark or trademark of Microsoft Corporation in the United States and other
countries.
All other product or company names that may be mentioned in this publication are trade names, trademarks, or
registered trademarks of their respective owners.

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Product overview
Introduction to GM70
Vaisala CARBOCAP® Handheld Carbon Dioxide Meter GM70 measures volume concentration of CO2 gas and displays
the result in the units of ppm or %. The exceptional stability and reliability performance of GM70 comes from the
advanced silicon based Vaisala CARBOCAP® sensor.
Basic features of GM70
Numerical and graphical multilingual displays
Data logging possibility
A tool for checking the reading of fixed CO2 transmitters
A tool for adjusting Vaisala GMP220 series probes
Possibility for an analog output (voltage signal 0 … 1 V)
Sampling methods: diffusion sampling (GMH70 handle) or pump-aspirated sampling (GM70PUMP), alternatively
Multiprobe operation; any combination of 2 Vaisala DM70, GM70, HM70, and MM70 series probes can be used,
for example, for simultaneous CO2 and dew point measurements
The optional, ready-to-use MI70 Link Microsoft Windows® software, which allows an easy way to handle
measurement data using a USB instrument cable or an RS-232 serial communication cable.
Using GM70 with Vaisala carbon dioxide probes and transmitters is discussed in the respective User Guides, available at
www.vaisala.com.
Related reference
Related manuals
Interchangeable probes
By selecting the right GMP220 series probe you can choose the measuring range that best fits your application. The
measuring ranges vary from 0 … 10 000 ppm to 0 … 20 % concentrations of CO2. To change the measuring range, you
only have to change the probe.
Related reference
Probes
GM70 specifications
Parts description
Figure 1. GM70 parts

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1 MI70 indicator
2 Charger socket
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 the MI70 indicator
Probes
The GMP220 series probes can be used with GM70. The table below lists the measuring ranges that can be selected for
the probes.
Table 1. GMP221 and GMP222
measuring ranges
Probe CO2 measuring ranges

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Probe CO2 measuring ranges
GMP221
0 … 2 %
0 … 30 %
0 … 5 %
0 … 10 %
0 … 20 %
GMP222
0 … 2000 ppm
0 … 3000 ppm
0 … 5000 ppm
0 … 7000 ppm
0 … 10000 ppm
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.
GM70PUMP for aspirated sampling
The GM70 aspiration pump consists of a pump and a measurement chamber for CO2 measurements. GM70PUMP is
designed for checking of fixed CO2 transmitters and for sampling from locations difficult to access. GM70PUMP is
connected to an MI70 indicator which displays the measurement result. The pump system is powered through the MI70
indicator.
Safety
The Vaisala CARBOCAP® Handheld Carbon Dioxide Meter GM70 delivered to you has been tested for safety and
approved as shipped from the factory. Note the following precaution:
CAUTION! Do not modify the unit or use it in ways not described in the documentation. Improper
modification or use may lead to safety hazards, equipment damage, failure to perform according to
specification, or decreased equipment lifetime.
ESD protection
Electrostatic Discharge (ESD) can damage 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 in the equipment housing.
To avoid delivering high static voltages to the product:
Handle ESD‑sensitive components on a properly grounded and protected ESD workbench or by grounding
yourself to the equipment chassis with a wrist strap and a resistive connection cord.
If you are unable to take either precaution, touch a conductive part of the equipment chassis with your other hand
before touching ESD‑sensitive components.
Hold component boards by the edges and avoid touching component contacts.

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MI70 indicator
MI70 indicator parts
Figure 1. MI70 indicator parts
1 Charger socket
2Function key shortcut buttons . The functions change according to what you are doing with the indicator.
3 Arrow buttons:
Move up in a menu
Move down in a menu
Enter a sub-menu
Return to previous menu level
4 Power On/Off button
5 Battery compartment at the back of the indicator
6 2 ports with M12 4-pin female connectors for connecting probes and instruments. The ports are labeled I and II.
To open menus, press an arrow button and then press the shortcut buttons. To activate a function shown above the
shortcut button, press the shortcut button. To navigate in the menus, press the arrow buttons.
Installing and recharging MI70 batteries
Vaisala recommends using the rechargeable battery pack (item code 26755) with GM70, instead of alkaline
batteries.

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If you are using alkaline batteries, unscrew the back plate of the indicator and insert the batteries. Do not attempt to
recharge standard alkaline batteries.
If you ordered MI70 with a rechargeable battery, it is already in place as shipped from the factory. The delivered
batteries have been pre-charged.
To recharge the rechargeable battery:
1. Plug in the charger connector to the MI70 indicator. The socket is located at the top of the indicator, covered by a
rubber seal.
2. Connect the charger to a wall socket. An animated battery icon in the left corner of the display indicates that the
battery is charging. The recharge duration (typically 4 … 5 h) depends on the charge level of the battery.
A new battery takes approximately 3 charging cycles to reach its maximum capacity.
Do not store the batteries empty. Empty batteries may not charge after an extended storage period.
MI70 battery status information
The status of the MI70 battery is shown by the battery icon in the upper left corner of the display. Possible statuses are
listed in the following table.
Table 1. MI70 battery status indicator
Battery status indicator graphic Description
Battery status icon. The icon can show the following info:
0 … 8 bars, no animation:
batteries are in use, a charger is not connected
if a charger is connected: non-rechargeable batteries installed
if a charger is connected: waiting for the battery temperature to
settle between 0 … +40 °C (+32 … +104 °F)
if a charger is connected and the icon remains at 8/8 bars: the
battery is full
Animated battery status icon: battery is charging (or recovering after
emptying out completely). The charging animation is shown also when the
indicator is powered off.
Battery icon not present: batteries are not installed
An empty battery icon with an X over it means that the battery cannot be recharged
and must be replaced. If the indicator is powered on, a notification about not being
able to charge the battery is shown on the MI70 screen.
You can order replacement batteries from Vaisala (item code 26755).
To keep the rechargeable MI70 battery in good working condition, recharge MI70 monthly if the indicator is
not in use.
MI70 first start-up settings
When taking MI70 into use for the first time, configure the basic settings (language, date, and time) as instructed below.
1. Press the Power On/Off button in MI70 to switch the indicator on.
2. Press any of the arrow buttons and open the menu by pressing Open.
3. Select Settings using the buttons and press .
4. Select User interface and press .
5. Select Language and press Set.
6. Select the language using the buttons. Confirm the selection by pressing Select.
The language selection can be changed later in the user interface settings of MI70.
7. To set the date, return to the Settings menu by pressing .
8. Select Date and press Set. Change the date using the buttons. To confirm the selection, press Select.

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To select an alternative date format, select Date format and press Set. You can select from 3 alternative formats.
Press Select to confirm the selection.
9. To set the time, return to the Settings menu by pressing
10. Select Time and press Set. Change the time by using the arrow buttons. Confirm the selection by pressing
OK. As a default, the time format is based on the 24-hour clock. If you want to use the 12-hour clock, select 12-
hour clock and press On.
11. To ensure the best possible accuracy, set the actual pressure and temperature values to 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 the 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 the arrow buttons. Press +/- to change the sign of the value. Press
OK to save the value.
12. To return to the basic display, press Exit.
Changing the rechargeable battery pack
New rechargeable battery pack
Medium-sized flat head screwdriver
In case you are installing a rechargeable battery pack in the MI70 indicator and you have a device with alkaline batteries,
remove the metal contact from the probe port end of the battery compartment before installing the battery pack.
1. Open the back plate of the indicator by opening the screw of the back plate.
2. Remove the old battery pack. Detach the black connector by carefully pulling it up from the wires.
3. Connect the black connector of the new battery pack. Make sure the position of the connector is as shown in the
following figure (red and black wires are on the upper edge of the connector). Do not push the connector with
conducting material.

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4. Place the battery pack in the compartment.
5. Close the back plate and tighten the screw.
6. Recharge the indicator before use.

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Measuring carbon dioxide
Overview
This chapter consists of instructions on how to carry out carbon dioxide measurements.
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 GM70. The acceptable pressure
value range is 700 … 1300 hPa.
Before measurements ensure that the air pressure and temperature settings are correct. Set the correct
settings as instructed in Setting actual pressure value and unit.
Taking measurements (diffusion sampling with GMH70
handle)
When using the MI70 indicator for the first time, see MI70 first start-up settings before proceeding to take
measurements.
To take measurements using the GMH70 handle:
1. Connect the probe cable to the MI70 indicator's connector port.
2. Switch MI70 on by pressing the Power ON/OFF button.
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 GM70.
4. Install the probe to the measuring position. Avoid exhaling near the probe as this increases the CO2
concentration.
5. The MI70 basic display opens. Allow the reading to stabilize.
CAUTION! Handle the probe carefully. Strong impact or falling may damage the probe.
If you need to disconnect the probe, first press the Power ON/OFF button to switch the MI70
indicator off. This ensures that all settings and data are saved properly.
Taking measurements (pump-aspirated sampling with
GM70PUMP)
When using the pump-aspirated system it is recommended to power the system by using the charger socket
connected to a wall socket.
Only one pump-aspirated system can be connected to MI70 at a time.
To use GM70PUMP for pump-aspirated sampling:
1. Connect one end of the sampling tube to the gas inlet (marked with IN), if using a tube.
2. Connect the black cable of GM70PUMP to the MI70 indicator's connector port.