CO2 monitor for indoor air quality measurement

CO2 Display

measures CO2, rh & temperature
internal logger with USB access
easy to read display

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Improve health and safety and workplace environments.

This display unit is a useful aid to improving workplace conditions. CO2 levels can increase in work areas and closed rooms. Meeting rooms and training rooms are often internal rooms that may not have the best ventilation systems. High CO2 can lead to loss of concentration and fatigue. A wall mounted display can indicate that ventilation needs to be improved. 

350 to 450 ppm

0.035 to 0.045 %

Fresh air outside

600 to 1,200 ppm

0.06 to 0.12 %

Room air

>1,000 ppm

>0.1 %

 Fatigue and loss of concentration

5,000 ppm

0.5 %

 Max. permissible value

at the workplace

38,000 ppm

3.8 %

 Breathing air (direct exhalation)

>100,000 ppm

>10 %

Nausia, vomiting loss of

conciousness and death

This low cost CO2 display can be desk, bench-top or wall-mounted and provides useful information. It can also be mounted in cellars and areas where CO2 could accumulate. 

The display acts as a visual warning when levels increase and the internal logger records the date, time, CO2, rh and temperature for download to a PC for charts and analysis if necessary.



CO2, relative humidity and temperature

Range of application

0 to 50 °C or 0 to 95 %rh, non-condensing


Real time clock


Adjustable for CO2 measurement

Warm-up time

< 1 min

Memory capacity

18,000 values with time stamp, automatic recording (%RH / °C / ppm)


As download (SW21) 

Display and evaluation of the measured values

CO2 measurement

Measurement principle

Infrared (NDIR) with automatic calibration (ABC)

Measurement range

0 to 5000 ppm

Accuracy at 23 °C ± 5 K

± 30 ppm ± 5 % of the measured value

Response time

< 3 min. diffusion time

Adjustment points

0, 400 ppm or any value between 0 and 990 ppm

Pressure dependence

+ 1.6 % reading per kPa

Null drift

< 10 ppm/year


No maintenance (standard indoor application)

 Humidity measurement

 Humidity sensor


Measurement range

0 to 100 %rh

Accuracy at 23 °C ± 5 K

< 2.5 %rh (10 to 90 %rh)

Adjustment points

35, 80 %rh

Response time t63

< 30 s, without filter

Long-term stability

< 1.5 %rh / year

 Temperature measurement

Sensor NTC
Measurement range -20 to +60 °C
Accuracy at 23 °C ± 5 K ± 0.3 K
Response time 4 s



CE conformant 2004/108/EC



1400 g


330 x 250 x 50 mm

Housing material



Power supply

AC adapter 12 VDC

Current consumption

700 mA (max)

All specifications subject to change