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Luftgteampel farbig 200x200
Innovation price 2006

Air Quality Signal (MF420-IR Mobile)

The Air Quality Signal has been designed especially to monitor the ambient air quality in interiors. It determines, by using a specific two-beam infrared photometer (NDIR) , developed and produced our company, the absolute CO2 concentration in the ambient air (atmospheric partial pressure). The device is constantly self-monitoring. The system reports malfunctions of hardware and software and is low-maintenance under normal applications thanks to the NDIR technology - we recommend at least an annual inspection.

The air quality signal can be mounted on the wall or simply placed on a shelf and is equipped with an AC adapter for power supply. An installation by a specialist is not required. A traffic-light function, via three LEDs indicates the carbon dioxide concentration in the air and thus the air quality.

Measuring ranges and threshold values

The Air Quality Signal measures the CO2 concentration between 0-3000 ppm.

The standard threshold values are configured in accordance with the recommendation of the German Federal Environmental Agency.

< 1500 ppm LED green
1500 ppm to < 2500 ppm LED yellow
2500 ppm to < 3000 ppm LED red
> 3000 ppm LED red flashing

The threshold values can be factory customized individually, within their measuring range, according to customer requirements.
When exceeding the first threshold value (1500 ppm) a short audible signal will sound and the LED light turns from green to yellow. If the second threshold value (2500 ppm) is exceeded, the LED light turns from yellow to red and the device again triggers an audible alarm. If the third threshold value (3000 ppm) is exceeded, the red LED flashes continuously. If the CO2 concentration falls below the first threshold, the device goes back to the ground state and the green LED lights up again.

Optionally the air quality signal can be ordered with an integrated data logger for recording of the measurements.

Data Logger

At the product MF420-IR mobile with data logger, readings for later analysis on a PC can be stored. Measurement values can be stored up to one week in a 60-second clock pulse. The accompanying analysis software provides the ability to display the data graphically or to export for post-processing into a spreadsheet program.


The device complies with the generic standards EN 61000-6-2 and EN 61000-6-4 and thus the EMC Directive 2004/108/EC.

Maintenance and service

The device thanks to its NDIR-Technology is low-maintenance - we recommend at least an annual inspection.

For more details, please refer to the technical data or ask our contact person.


Product NameProduct FeaturesProduct Code
MF420-IR Mobile without data logger
measuring range 0 - 3000 ppm
MF420-IR Mobile with Data Logger with data logger
measuring range 0 - 3000 ppm


Principle of Measurement NDIR (two-beam infrared photometer)  
Power Supply Power Adapter 230 V AC
Current approx. 350 mA
Ambient Temperature -10°C to +50°C  
Air Pressure 900 hPa to 1100 hPa  
Permissible Humidity 15 to 95% relative humidity non condensing
Optical Display green LED [CO2] < 1,500 ppm
yellow LED 1,500 ppm < [CO2] < 2,500 ppm
red LED [CO2] > 2,500 ppm
red LED flashing [CO2] > 3,000 ppm
Housing Plastic white  
Protection class IP 30
Weight approx. 150 g
Dimensions (L x W x H) 78 x 78 x 35 mm

Product NameProduct FeaturesProduct Code
Configuration set Set consists of:
- CD with configuration software for data logger
- Connection cable
Plug power Supply 230V AC Plug power Supply Z4A0-C0004
Concealed Power Supply 230V AC power supply for mounting in a flush mounted box Z2A0-C0003
Acrylic Display Display for mounting an air quality signal for presentation purposes Z0A0-B0001