H2S-B4 Hydrogen Sulfide Sensor (H2S Sensor) Description
Alphasense Hydrogen Sulfide gas sensors operate using well-known 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 for the next generation of portable gas detectors
With very high sensitivity and low zero, accurate and stable readings are possible when measuring current concentration ranges from ppb to 1% H2S.
| H2S-B4 Hydrogen Sulfide Sensor (H2S Sensor) PERFORMANCE | ||
| Sensitivity | nA/ppm at 2ppm H2S | 1450 to 2150 |
| Response time | t90 (s) from zero to 2ppm H2S | <55 |
| Zero current | nA in zero air at 20℃ | -250 to 200 |
| Noise* | ±2 standard deviations (ppb equivalent) | 1 |
| Range | ppm H2S limit of performance warranty | 100 |
| Linearity | ppb error at full scale, linear at zero and 40ppm H2S | <±4 |
| Overgas limit | maximum ppm for stable response to gas pulse | 200 |
| * Tested with Alphasense ISB low noise circuit | ||
| H2S-B4 Hydrogen Sulfide Sensor (H2S Sensor) LIFETIME | ||
| Zero drift | ppb equivalent change/year in lab air | <±100 |
| Sensitivity | drift % change/year in lab air, monthly test | <20 |
| Operating life | months until 50% original signal (24 month warranted) | > 24 |
| H2S-B4 Hydrogen Sulfide Sensor (H2S Sensor) ENVIRONMENTAL | ||
| Sensitivity @ -20℃ | (% output @ -20°C/output @ 20℃) @ 2ppm H2S | 77 to 90 |
| Sensitivity @ 50℃ | (% output @ 50°C/output @ 20℃) @ 2ppm H2S | 100 to 110 |
| Zero @ -20℃ | nA change from 20℃ | 50 to 60 |
| Zero @ 50℃ | nA change from 20℃ | -120 to -160 |
| H2S-B4 Hydrogen Sulfide Sensor (H2S Sensor) CROSS SENSITIVITY | ||
| NO2 sensitivity | % measured gas @ 5ppm NO2 | <-10 |
| Cl2 sensitivity | % measured gas @ 5ppm Cl2 | <-12 |
| NO sensitivity | % measured gas @ 5ppm NO | <12 |
| SO2 sensitivity | % measured gas @ 5ppm SO2 | <20 |
| CO sensitivity | % measured gas @ 5ppm CO | <3 |
| H2 sensitivity | % measured gas @ 100ppm H2 | <0.5 |
| C2H4 sensitivity | % measured gas @ 100ppm C2H4 | <0.1 |
| NH3 sensitivity | % measured gas @ 20ppm NH3 | <0.1 |
| CO2 sensitivity | % measured gas @ 5% CO2 | <0.1 |
| H2S-B4 Hydrogen Sulfide Sensor (H2S Sensor) KEY SPECIFICATIONS | ||
| Temperature range | ℃ | -30 to 50 |
| Pressure range | kPa | 80 to 120 |
| Humidity range | % rh | 15 to 90 |
| Storage period | months @ 3 to 20℃ (stored in sealed pot) | 6 |
| Load resistor | Ω (ISB circuit is recommended) | 33 to 100 |
| Weight | g | <13 |
