CALL: A.WIHARTA 081294124885 085778084789 087784022201 Model AL ( Alarm) is equipped with two relays that can be connected to an alarm system. It measures CO2 in very high concentrations. Applications Ventilation control in underground garages, transport/ storage, vehicle terminals, tunnels, etc... Features • Model : AL ( Alarm) • Measurement range CO2 : 0… 4 % vol ( 0… 40, 000 ppm) • Accuracy: ± 200 ppm • Output 1: ( 0...4 % vol) 0/ 2… 10 VDC or 0/ 4… 20 mA • Output 2: ( 0...4 % vol) 0/ 2… 10 VDC or 0/ 4… 20 mA • Output 3 ( CO2) : Relay 1: open 1.5 % • Output 4 ( CO2) Relay 2: open 3.0 % • Range of application: 0… 50 ° C ( 30...120 ° F) / 0… 95 % RH • Communication: MODBUS • Maintenance: Is not necessary for normal indoor applications. Certain industrial applications require annual calibration. • Lifetime: > 15 years