MF420-IR-AL

The measuring system MF420-IR AL determines by using a specific two-beam infrared photometer (NDIR) , developed and produced by 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 two independent relay outputs can be activated, for example to start automatic window openers, air conditioning or fans.

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Measuring Ranges and threshould values

The MF420-IR AL measures the CO2 concentration between 0-3000 ppm or 0 to 5000 ppm.

The standard threshold values in the variant 0-3000 ppm 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.

Relay Connections

The product has two independent relay contacts with max. 10 W (max. 50V switching voltage / max. 0.5 A switching current). The relay contact 2 sends a short pulse when the CO₂ concentration exceeds 1,500 ppm, relay contact 1 sends a short pulse when the CO₂ level drops below 1,400 ppm.

Certifications

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 Name	Product Features	Product Code
MF420-IR-AL	Carbon Dioxide Measuring range 0 - 3000 ppm	G2G0-I09NP-B100
MF420-IR-AL	Carbon Dioxide Measuring range 0 - 5000 ppm	G2G0-I09OP-B100

Principle of Measurement	NDIR (two-beam infrared photometer)
Power Supply	Screw Terminals
	Voltage	24 V DC ± 5%
	Current	approx. 100 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
Malfunction	Hard- und Software	yellow LED flashing
Output	Terminal 1, relais contact	Typ. Impulse 3.5 s max. 100 V 0.5 A Switch current max. 10 VA / W Impulse at [CO₂] < 1,400 ppm
Output	Terminal 2, relais contact	Typ. Impulse 3.5 s max. 100 V 0.5 A Switch current max. 10 VA / W Impulse at [CO₂] > 1,500 ppm
Housing	Plastic white
	Protection class	IP 30
	Weight	approx. 150 g
	Dimensions (L x W x H)	78 x 78 x 35 mm
Connecting cable	5 x 0.25² Cu	shielded cable

Pin Assignment:

For more details, please ask our contact person.