SO2-B4 Sulfur Dioxide Sensor SO2 Sensor Description
Alphasense Sulfur Dioxide gas sensors operate using proven fuel cell technology.
Sensors are available in the following sizes:
A: 20mm diameter, the industry standard size for portable gas detectors
B: 32mm diameter package, the best choice for fixed site applications
D: miniature, with proven long-term performance. Sensors designed for the next generation of portable gas detectors.
The SO2 range provides OEMs with reliable sensors for use in a variety of applications. Strong signal levels combined with low zero current allows resolution below 1ppm and an operating range for safety applications up to 2,000ppm. The sensors are designed for use in both fixed site and portable instrumentation.
The SO2 sensors offer our electrolyte leak-free guarantee and reliable long-term detection performance. The leakproof housing is moulded with a colour coded top for ease of identification.
| SO2-B4 Sulfur Dioxide Sensor SO2 Sensor PERFORMANCE | ||
| Sensitivity | nA/ppm at 2ppm SO2 | 275 to 475 |
| Response time | t90 (s) from zero to 2ppm SO2 | <30 |
| Zero current | nA in zero air at 20℃ | |
| Noise* | ±2 standard deviations (ppb equivalent) | 5 |
| Range | ppm limit of performance warranty | 100 |
| Linearity | ppb error at 100ppm SO2, linear at zero and 10ppm SO2 | 0 to -2 |
| Overgas limit | maximum ppm for stable response to gas pulse | 200 |
| * Tested with Alphasense ISB low noise circuit | ||
| SO2-B4 Sulfur Dioxide Sensor SO2 Sensor LIFETIME | ||
| Zero drift | ppb equivalent change/year in lab air | <±20 |
| Sensitivity drift | % change/year in lab air, monthly test | <±15 |
| Operating life | months until 50% original signal (24 month warranted) | > 36 |
| SO2-B4 Sulfur Dioxide Sensor SO2 Sensor ENVIRONMENTAL | ||
| Sensitivity @ -20℃ | (% output @ -20℃/output @ 20℃) @ 2ppm SO2 | 70 to 82 |
| Sensitivity @ 50℃ | (% output @ 50℃/output @ 20℃) @ 2ppm SO2 | 95 to 110 |
| Zero @ -20℃ | nA change from 20℃ | 0 to -10 |
| Zero @ 50℃ | nA change from 20℃ | 10 to 30 |
| SO2-B4 Sulfur Dioxide Sensor SO2 Sensor CROSS SENSITIVITY | ||
| Filter capacity | ppm·hrs | 450 |
| H2S | sensitivity % measured gas @ 5ppm H2S | <2 |
| NO2 | sensitivity % measured gas @ 5ppm NO2 | <-160 |
| Cl2 | sensitivity % measured gas @ 5ppm Cl2 | <-40 |
| NO | sensitivity % measured gas @ 5ppm NO | <-2 |
| CO | sensitivity % measured gas @ 5ppm CO | <2 |
| H2 | sensitivity % measured gas @ 100ppm H2 | <0.5 |
| C2H4 | sensitivity % measured gas @ 100ppm C2H4 | <1 |
| NH3 | sensitivity % measured gas @ 20ppm NH3 | <0.1 |
| CO2 | sensitivity % measured gas @ 5% CO2 | <0.1 |
| SO2-B4 Sulfur Dioxide Sensor SO2 Sensor KEY SPECIFICATIONS | ||
| Temperature range | ℃ | -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 (ISB circuit is recommended) | 33 to 100 |
| Weight | g | <13 |
