Introduction of 1. double gas sensor carbon monoxide/hydrogen sulfide sensor COH-A2:

The COH-A2 sensor provides a unique approach in terms of outer size and electrode structure. The use of a high-capacity filter on the working electrode of carbon monoxide can completely eliminate the cross-sensitivity of the channel to hydrogen sulfide, acid gas and similar sulfur dioxide and nitrogen oxides. The use of COH-A2 series sensors in portable instrument design enables accurate factory-level maintenance and field-level calibration of composite gases without worrying about incorrect CO channel tuning.

Technical indicators of the carbon monoxide channel of 2. COH-A2 type sensors:

Resolution:<0.5ppm
Response time t90 (seconds)<35s
Measuring range: 1000 ppm
Zero current:-3 ~ 3.5ppm
Sensitivity: 50-100 nA/ppm, 400ppm CO
Linearity: full scale 10 ~ 40ppm error, 0-400ppm linear
Overload range: 5,000ppm/Max concentration of stable response gas pulse

Technical specifications of the hydrogen sulfide channel of 3. COH-A2 type sensors:
Resolution:<0.1ppm
Response time t90 (seconds)<30s
Measuring range: 100 ppm
Zero current: ± 0.25ppm
Sensitivity: 650-1100 nA/ppm, 20ppm H2S
Linearity: full scale <± 5ppm error, 0-20ppm linearity
Overload range: 200ppm/Max concentration of stable response gas pulse