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SOH-A2 Sulfur Dioxide + Hydrogen Sulfide Sensor Introduction
Personal gas safety monitors can be found in almost every industry, with the requirement for multiple gas detection becoming commonplace.
Sulfur gases are toxic with a complex chemistry. Measuring both SO2 and H2S provides the information for separating the corrosive gases, but with different toxicologies.
2Sense Dual Gas
Save space and save cost with our 2Sense family of dual gas sensors, in the A-series 20mm size.
With a patented design and best response, these dual sensors offer the required performance with obvious advantages.
SO2 / H2S the SOH-A2 measures the two critical Sulfur gases together within one sensor body and using a software algorithm, separates the two gases for clear discrimination.
Sulfur Dioxide Sensor (SO2 Sensor) SpecificationSulfur Dioxide Sensor PERFORMANCE Sensitivity nA/ppm in 10ppm SO2 140 to 250 Response time t90 (s) from zero to 10ppm SO2 <15 Zero current ppm equivalent in zero air <± 0.2 Resolution rms noise (ppm equivalent) <0.2 Range ppm SO2 limit of performance warranty 20 Linearity ppm error at full scale, linear at zero and 10 ppm SO2 <±2 Overgas limit ppm maximum SO2 for stable response to gas pulse 50 Sulfur Dioxide Sensor LIFETIME Zero drift ppm equivalent change/year in lab air <0.5 Sensitivity drift % change/year in lab air, monthly test <6 Operating life months until 80% original signal (24 month warranted) 24 Sulfur Dioxide Sensor ENVIRONMENTAL Sensitivity @ -20°C % (output @ -20°C/output @ 20°C) @ 10ppm SO2 90 to 100 Sensitivity @ 50°C % (output @ 50°C/output @ 20°C) @ 10ppm SO2 80 to 100 Zero @ -20°C ppm equivalent change from 20°C -0.2 to 0.2 Zero @ 50°C ppm equivalent change from 20°C 0.2 to 0.8 Sulfur Dioxide Sensor CROSS SENSITIVITY Filter capacity ppm hours of Hydrogen Sulfide nd H2S sensitivity % measured gas @ 20ppm H2S <15 NO2 sensitivity % measured gas @ 10ppm NO2 <-150 Cl2 sensitivity % measured gas @ 10ppm Cl2 <-50 NO sensitivity % measured gas @ 50ppm NO <50 CO sensitivity % measured gas @ 400ppm CO <1 H2 sensitivity % measured gas @ 400ppm H2 @ 20°C <1 C2H4 sensitivity % measured gas @ 400ppm C2H4 <40 NH3 sensitivity % measured gas @ 20ppm NH3 <1 Sulfur Dioxide Sensor KEY SPECIFICATIONS Temperature range °C -30 to 50 Pressure range kPa 80 to 120 Humidity range %rh continuous (see note below) 15 to 90 Storage period months @ 3 to 20°C (stored in sealed pot) 6 Load resistor Ω (recommended) 10 to 47 Weight g <6
Hydrogen Sulfide Sensor (H2S Sensor) Specification
| Hydrogen Sulfide Sensor PERFORMANCE | ||
| Sensitivity | nA/ppm in 20ppm H2S | 450 to 900 |
| Response time | t90 (s) from zero to 20ppm H2S @ 20℃ | <25 |
| Zero current | ppm equivalent in zero air | ± 0.25 |
| Resolution | rms noise (ppm equivalent) | <0.1 |
| Range | ppm H2S limit of performance warranty | 100 |
| Linearity | ppm error at full scale, linear at zero and 20ppm H2S | <±5 |
| Overgas limit | maximum ppm H2S for stable response to gas pulse | 200 |
| Hydrogen Sulfide Sensor LIFETIME | ||
| Zero drift | ppm equivalent change/year in lab air | <0.1 |
| Sensitivity drift | % change/year in lab air, monthly test | <2 |
| Operating life | months until 80% original signal ( 24 month warranted) | 24 |
| Hydrogen Sulfide Sensor ENVIRONMENTAL | ||
| Sensitivity @ -20°C | % (output @ -20°C/output @ 20°C) @ 20ppm H2S | 75 to 90 |
| Sensitivity @ 50°C | % (output @ 50°C /output @ 20°C) @ 20ppm H2S | 100 to 110 |
| Zero @ -20°C | ppm equivalent change from 20°C | ±0.2 |
| Zero @ 50°C | ppm equivalent change from 20°C | ±0.2 |
| Hydrogen Sulfide Sensor CROSS SENSITIVITY | ||
| Filter capacity | ppm.hrs of SO2 | nd |
| NO2 sensitivity | % measured gas @ 10ppm NO2 | <-25 |
| Cl2 sensitivity | % measured gas @ 10ppm Cl2 | <-20 |
| NO sensitivity | % measured gas @ 50ppm NO | <15 |
| SO2 sensitivity | % measured gas @ 10ppm SO2 | <30 |
| CO sensitivity | % measured gas @ 400ppm CO | <1.5 |
| H2 sensitivity | % measured gas @ 400ppm H2 | <0.2 |
| C2H4 sensitivity | % measured gas @ 400ppm C2H4 | <0.2 |
| NH3 sensitivity | % measured gas @ 20ppm NH3 | <±0.5 |
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