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

  • Hydrogen Sulfide Sensor (H2S Sensor) 4-Electrode
  • Hydrogen Sulfide Sensor (H2S Sensor) 4-Electrode
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• Range: 100 ppm H2S limit of performance warranty
• Sensitivity: 1450 to 2150 nA/ppm at 2ppm H2S
• Response time t90: < 55 (s) from zero to 2ppm H2S
• Linearity: < ±4 ppb error at full scale
• Temperature range: -30 to 50​ ℃
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90% rh

  • Model Number: H2S-B4
  • Data Sheet: Date Sheet File
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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 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

Matched Transmitter board for H2S-B4 H2S Sensor

Individual Sensor Board (ISB) Alphasense B4 4-Electrode Gas Sensors
The Individual Sensor Board (ISB) is designed for use with the Alphasense B4 family of four-electrode gas sensors. This potentiostat provides a dual channel voltage output.
A low noise bandgap provides the bias voltage for NO sensors and the ISB can measure both oxidising (CO, H2S, SO2 and NO) and reducing (O3 and NO2) gases.
The ISB is configured for specific sensors: NO, NO2, O3 and CO / H2S / SO2 .
Designed for low power applications, the ISB requires 3.5 to 6.4 stable DC supply at only 1mA.

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