1. double gas sulfur dioxide/hydrogen sulfide sensor SOH-A2 introduction:
The SOH-A2 sensor provides a unique approach in terms of external dimensions and electrode structure. The use of a high-capacity filter on the working electrode of sulfur dioxide can completely eliminate the cross-sensitivity of the channel to hydrogen sulfide, acid gas and nitrogen oxide. The use of SOH-A2 series sensors in the design of portable instruments can enable accurate factory-level maintenance and field-level calibration of composite gases without worrying about incorrect SO2 channel adjustment.

Technical indicators of the sulfur dioxide channel of the 2. SOH-A2 type sensor:
Resolution:<0.2ppm
Response time: t90 (seconds)<15
Measuring range: 20 ppm
Zero current:<± 0.2ppm
Sensitivity: 140-250 nA/ppm, 10ppm SO2
Linearity: 0-10ppm SO2 linearity, full range linearity error <± 2ppm
Overload range: 50ppm/stable response gas pulse Max concentration <!--0.1ppm
<!--0.1ppm
<!--±0.2ppm
<!--±0.2ppm

Technical specifications of the hydrogen sulfide channel of 3. SOH-A2 type sensors:
Resolution:<0.1ppm
Response time t90 (seconds)<25
Measuring range: 200 ppm
Zero current: ± 0.25ppm
Sensitivity: 450-900 nA/ppm, 20ppm H2S
Linearity: 0-20ppm linear, full range error <± 5ppm
Overload range: 200ppm/Max concentration of stable response gas pulse