Dual gas sensor/carbon monoxide/hydrogen sulfide sensor COH-A2

Dual gas sensor/carbon monoxide/hydrogen sulfide sensor COH-A2

1、 Dual Gas Sensor Carbon Monoxide/Hydrogen Sulfide Sensor COH-A2 Introduction:
The COH-A2 sensor provides a unique method in terms of external dimensions and electrode structure. Using a high-capacity filter on the working electrode of carbon monoxide can completely eliminate the cross sensitivity of channels to hydrogen sulfide, acid gas, and similar sulfur dioxide and nitrogen oxides. The use of COH-A2 series sensors in portable instrument design enables precise factory level maintenance and on-site calibration of composite gases, without worrying about incorrect calibration of CO channels
2、 Technical specifications of the carbon monoxide channel of COH-A2 sensor:
Resolution: 0.5ppm
Response time t90 (seconds)<20s
Measurement range: 2000 ppm
Zero point current<0~-4ppm
Sensitivity: 50-95 nA/ppm, 400ppm CO
Linear: Full range error of 10~40ppm, linear range of 0-400ppm
Overload range: 5000ppm/maximum concentration of stable response gas pulse

3、 Technical specifications of the hydrogen sulfide channel of COH-A2 sensor:
Resolution:<0.05ppm
Response time t90 (seconds)<30s
Measurement range: 200 ppm
Zero point current: 0~-0.3ppm
Sensitivity: 700-1000 nA/ppm, 20ppm H2S
Linearity: Full scale error of 0-3ppm, linearity of 0-20ppm
Overload range: 500ppm/maximum concentration of stable response gas pulse