Multi-function channel CO2 and/or air quality sensor with active output

The KCO2.T.RH + x or KLQ.T.RH with or without display determines the CO2 content, temperature, air quality and relative humidity in the duct, depending on the variant of the unit. The air quality is determined on the basis of a mixed gas sensor/VOC sensor (volatile organic compounds). The CO2 content of the air is determined by means of an NDIR sensor. A selfcalibration of the CO2 measurement is carried out every 7 days. To ensure this function, the unit must be supplied with fresh air (CO2 content approx. 400 ppm) at least once within a period of 7 days.

Technical Data

Power supply::24V DC
Max. current draw:VOC 10mA, CO2 20mA, CO2+VOC 25mA
OC on >6V, OC off <4V
Air quality sensor:VOC sensor (metal oxide)
Air quality measuring range:0...100% air quality
Air quality output signal:0-10V / OC 24V 50mA, short-circuit proof
1V = clean air
10 V = polluted air
Air quality meas. accuracy:±20% input value
Detection of the gases:non-selective
Temperature meas. range:0...+50°C
Temperature output signal:0-10V
Temp. meas. accuracy:± 1% of measuring range
Humidity meas. range:0...+100% R.H.
Humidity working range:10...+90% R.H.
Humidity output signal:0-10V
Humidity meas. accuracy:± 3% from 20...80% rH
Carbon dioxide sensor:optical sensor (NDIR)
CO2 measuring range:0...2.000 ppm
CO2 output signal:0-10V / OC 24V 50mA, short-circuit proof
CO2 meas. accuracy:+-30 ppm +3% of reading
Auto calibration CO2:can be deactivated via jumper
CO2 manual calibration:by means of fresh air and calibration button
Ambient temperature:0...+50°C
Humidity:< 95 % rH, non-condensing air
Connection head:ABS/PC,
colour pure white (similar to RAL 9010),
4 quick-release screws
Dimensions:81 x 55 x 35 mm plus PG
Protective pipe:ABS/ PC,
colour pure white (similar to RAL9010)
KCO2.T.RH.+x: EL = 165mm, Ø 28.5mm
KLQ.T.RH: EL = 160mm, Ø 16mm
Display (optional):LCD for T, rH, CO2,
VOC with different display modes
Electrical connection:0,14 - 1,5 mm² via screw terminals on circuit board
Run-in time:approx. 10 min
Cable gland:M16, with tension relief
Process connection:by means of ABS/PC
mounting flange (included)
Protection class:III (according to EN 60 730)
Protection type:Housing IP 65,
sensor IP40 (according to IEC 529)
Standards:CE conformity, electromagnetic
compatibility according to EN 61 326 +A1+A2,
EMV Directive 89/336/EWG


similar to image
KLQ.T.RH Display