Hydrogen Sulfide Sensor (H2S Sensor) 4-Electrode - H2S-B4

Range: 100 ppm H2S limit of performance warranty
Sensitivity: 1450 to 2050 nA/ppm at 2ppm H2S
Response time: < 45 t90 (s) from zero to 2ppm H2S
Linearity: < ±4 ppb error at full scale, linear at zero and 40ppm H2S
Temperature range: -30 to 50​ ℃

  • Model Number: H2S-B4
  • Data Sheet: Date Sheet File
Quantity:
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  • Hydrogen Sulfide Sensor (H2S Sensor) 4-Electrode
  • Hydrogen Sulfide Sensor (H2S Sensor) 4-Electrode
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Product Specification

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 2050
Response time t90 (s) from zero to 2ppm H2S < 45
Zero current nA in zero air at 20℃ -250 to 0
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

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