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Last change: 25 January 2021
v1.0

Contents
1 Safety notes ........................................................................................... 1
2 Device description ................................................................................ 2
2.1 Technical specifications ................................................................................................... 2
2.2 Display / touch screen ...................................................................................................... 3
2.3 Dimensions ...................................................................................................................... 3
3 Operating instructions ......................................................................... 4
3.1 On/off ............................................................................................................................... 4
3.2 Settings ............................................................................................................................ 4
3.3 Measurement graph / data history .................................................................................... 6
3.4 Alarms .............................................................................................................................. 6
3.5 CO2 traffic light function ................................................................ ................................ .... 7
4 Contact ................................................................................................. 7
5 Disposal ................................................................................................. 7
© PCE Instruments

© PCE Instruments
1
1 Safety notes
Please read this manual carefully and completely before you use the device for the first time. The
device may only be used by qualified personnel and repaired by PCE Instruments personnel.
Damage or injuries caused by non-observance of the manual are excluded from our liability and
not covered by our warranty.
• The device must only be used as described in this instruction manual. If used otherwise,
this can cause dangerous situations for the user and damage to the meter.
• The instrument may only be used if the environmental conditions (temperature, relative
humidity, …) are within the ranges stated in the technical specifications. Do not expose
the device to extreme temperatures, direct sunlight, extreme humidity or moisture.
• Do not expose the device to shocks or strong vibrations.
• The case should only be opened by qualified PCE Instruments personnel.
• Never use the instrument when your hands are wet.
• You must not make any technical changes to the device.
• The appliance should only be cleaned with a damp cloth. Use only pH-neutral cleaner,
no abrasives or solvents.
• The device must only be used with accessories from PCE Instruments or equivalent.
• Before each use, inspect the case for visible damage. If any damage is visible, do not
use the device.
• Do not use the instrument in explosive atmospheres.
• The measurement range as stated in the specifications must not be exceeded under
any circumstances.
• Non-observance of the safety notes can cause damage to the device and injuries to
the user.
We do not assume liability for printing errors or any other mistakes in this manual.
We expressly point to our general guarantee terms which can be found in our general terms of
business.
If you have any questions please contact PCE Instruments. The contact details can be found at
the end of this manual.

© PCE Instruments
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2 Device description
2.1 Technical specifications
Measurement range
Accuracy
Resolution
0 ... 9999 ppm CO
2
±75 ppm or ±5 % of rdg. (the higher value applies)
1 ppm
Measured variable temperature
Measurement range
Accuracy
Resolution
-10 ... 50 °C / 14 ... 122 °F
±1 °C
0.1 °C
Measured variable air humidity
Measurement range
Accuracy
Resolution
20 ... 95 % RH
±5 % RH
1 % RH
General technical specifications
Traffic light function through colour change of reading
Alarm tone
5 V mini USB (no rechargeable battery)
1 ... 85 °C / 14 ... 122 °F
20 ... 85 % RH
approx. 96 x 86 x 32.5 mm / 3.7 x 3.3 x 1.2 mm
Weight

© PCE Instruments
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2.2 Display / touch screen
1. Date and time
2. Set lower or upper alarm
3. CO2 reading (changes ist colour)
4. Increase or decrease alarm value
5. Lock screen
6. Unit change °C / °F
7. Air humidity reading in % RH
8. Show progress diagramme
9. Temperature reading
10. Settings
11. Alarm message
12. On & off
13. Mute alarm

© PCE Instruments
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3 Operating instructions
3.1 On/off
Connect the meter to the power supply. Touch the icon to turn on the meter. Touch the
icon while the power is on to turn off the meter.
3.2 Settings
Touch the icon to access the settings.
3.2.1 Setting the language
The following languages can be selected in the meter: English, Spanish, Italian, Russian, Polish,
Czech, German, French, Slovenian, Swedish, Portuguese
3.2.2 Setting the date and time
Touch the menu item Clock Setting to set the date and time.
3.2.3 Setting the temperature unit
Touch the menu item Temperature Format to switch between °C and °F.
3.2.4 Setting the display brightness
Touch the menu item Backlight to adjust the display brightness using the arrow keys at the
bottom right of the display. If you touch the item Ambient Light Dimming, the display brightness is
adjusted depending on the ambient light at the time of saving.
3.2.5 Standby screen
Touch the menu item Standby Screen to set the time period when the display dims the
brightness.
3.2.6 Screen lock
Touch the menu item Screen Lock to set a 4-digit PIN to protect against menu access.
Attention: Remember the PIN well. However, if you have forgotten your PIN, you can use the
master PIN 8657.
3.2.7 CO2 alarm limits
Touch the menu item to set the limits for the lower and upper alarm between 450 ... 4500
ppm.

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3.2.8 Calibration
3.2.8.1 CO2 factory calibration
Touch the menu item RESET CO2 To Factory Settings to calibrate the CO2 sensor to factory
settings. The meter must be placed in a well ventilated room or placed outside and run for 15
minutes.
3.2.8.2 Automatic calibration
The PCE-CMM 8 has an integrated self-correcting ABC algorithm (Automatic Baseline
Correction) for automatic adjustment of the baseline value. This calibration is carried out regularly
at intervals of 10-15 days.
For this, the PCE-CMM 8 requires a regular supply of fresh air. The measured value is
automatically adjusted.
The ABC function is permanently switched on (cannot be switched off) and adjusts the baseline
value at regular intervals when the CO2 level is low. Do not use this meter in a closed environment
where the CO2 concentration remains relatively high. This would negatively affect the selfcorrection of the device. We therefore recommend performing the manual calibration (3.2.8.1)
weekly.
3.2.9 Offset settings
3.2.9.1 CO2 offset
Touch the menu item CO2 Sensor Calibration to set an offset for the CO2 reading.
3.2.9.2 Temperature offset
Touch the menu item Built In Sensor to set an offset for the temperature reading.
3.2.9.3 Humidity sensor offset
Touch the menu item Humidity Sensor to set an offset for the humidity value reading.
3.2.10 Selecting the time zone
Touch this menu item to set the time difference from GMT. Press the key to enable
synchronisation of the power on/off time with the internet time. To do this, the meter must be
successfully connected to the internet.
3.2.11 Daylight saving time
Touch the menu item to set the daylight saving time based on the location.
3.2.12 Home screen colour
In the menu item Home Screen Colour , select whether the background colour should be blue
or black.

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3.2.13 Alarm tone
Select the option Alarm Speaker Settings . Touch the button to enable/disable the alarm
sound for the lower or upper alarm.
3.2.14 Reset to factory settings
Select Reset To Factory Settings to reset the meter to its factory default settings.
Attention: All previously made settings are lost!
3.3 Measurement graph / data history
3.3.1 Graph
Touch the icon to view the measurement history of the last 7 days. Here, you can view the
course of CO2, temperature and humidity.
To view the details of a particular day, touch the corresponding area above the date. Touch the
icon to view the previous screen.
3.3.2 Save data history
Touch the icon to view the measurement history of the last 7 days. Then select the menu
item Data Log Table. In the next window, you can save the measurement data per hour in a file
on the device by selecting the Save to File item.
3.3.3 Read data history on the PC
Connect the meter to a PC using the USB cable. The CO2 meter is recognised as a mass storage
device. In the file DATALOG.TXT, you can view the previously saved measurement data.
3.4 Alarms
Touch the number in the top right corner to set the alarm values for High and Low. The CO2 meter
uses these values to change the colour of the digits for the measured value and an alarm tone
can be heard, if selected.
3.4.1 Set upper alarm (High)
As soon as “high” appears in the upper right corner, you can set the upper alarm value using the
+ and - buttons. This default setting for this alarm threshold is 1200 ppm.
3.4.2 Set lower alarm (Low)
As soon as “low” appears in the upper right corner, you can set the lower alarm value using the
+ and - buttons. This default setting for this alarm threshold is 800 ppm.
3.4.3 Temporarily deactivating the alarm tone
If the alarm sound has been enabled in the settings, it sounds as soon as the measured value
exceeds or falls below the upper/lower alarm value. However, you can also temporarily deactivate
it by touching the icon on the main screen.

3.5 CO2 traffic light function
The CO2 meter has a traffic light function (CO2 traffic light). This means that the colour if the
reading changes, depending on the set alarm limit. The default limit values for changing colours
are as follows:
4 Contact
If you have any questions, suggestions or technical problems, please do not hesitate to contact
us. You will find the relevant contact information at the end of this user manual.
5 Disposal
For the disposal of batteries in the EU, the 2006/66/EC directive of the European Parliament
applies. Due to the contained pollutants, batteries must not be disposed of as household waste.
They must be given to collection points designed for that purpose.
In order to comply with the EU directive 2012/19/EU we take our devices back. We either re-use
them or give them to a recycling company which disposes of the devices in line with law.
For countries outside the EU, batteries and devices should be disposed of in accordance with
your local waste regulations.
If you have any questions, please contact PCE Instruments.
© PCE Instruments
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© PCE Instruments
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PCE Instruments contact information
Germany France Spain
PCE Deutschland GmbH
PCE Instruments France EURL
PCE Ibérica S.L.
Im Langel 4
23, rue de Strasbourg
Calle Mayor, 53
D-59872 Meschede
67250 Soultz-Sous-Forets
02500 Tobarra (Albacete)
Deutschland
France
España
Tel.: +49 (0) 2903 976 99 0
Téléphone: +33 (0) 972 3537 17
Tel. : +34 967 543 548
Fax: +49 (0) 2903 976 99 29
Numéro de fax: +33 (0) 972 3537 18
Fax: +34 967 543 542
[email protected] [email protected] [email protected]
www.pce-instruments.com/deutsch
www.pce-instruments.com/french
www.pce-instruments.com/espanol
United Kingdom Italy Turkey
PCE Instruments UK Ltd
PCE Italia s.r.l.
PCE Teknik Cihazları Ltd.Şti.
Unit 11 Southpoint Business Park
Via Pesciatina 878 / B-Interno 6
Halkalı Merkez Mah.
Ensign Way, Southampton
55010 Loc. Gragnano
Pehlivan Sok. No.6/C
Hampshire
Capannori (Lucca)
34303 Küçükçekmece -
İstanbul
United Kingdom, SO31 4RF
Italia
Türkiye
Tel: +44 (0) 2380 98703 0
Telefono: +39 0583 975 114
Tel: 0212 471 11 47
Fax: +44 (0) 2380 98703 9
Fax: +39 0583 974 824
Faks: 0212 705 53 93
[email protected] [email protected] [email protected]
www.pce-instruments.com/english
www.pce-instruments.com/italiano
www.pce-instruments.com/turkish
The Netherlands China Hong Kong
PCE Brookhuis B.V.
PCE (Beijing) Technology Co., Limited
PCE Instruments HK Ltd.
Institutenweg 15
1519 Room, 6 Building
Unit J, 21/F., COS Centre
7521 PH Enschede
Zhong Ang Times Plaza
56 Tsun Yip Street
Nederland
No. 9 Mentougou Road, Tou Gou District
Kwun Tong
Telefoon: +31 (0)53 737 01 92
102300 Beijing, China
Kowloon, Hong Kong
[email protected] Tel: +86 (10) 8893 9660
Tel: +852-301-84912
www.pce-instruments.com/dutch
[email protected] [email protected]
www.pce-instruments.cn
www.pce-instruments.cn
United States of America
PCE Americas Inc.
1201 Jupiter Park Drive, Suite 8
Jupiter / Palm Beach
33458 FL
USA
Tel: +1 (561) 320-9162
Fax: +1 (561) 320-9176
[email protected]
www.pce-instruments.com/us