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

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  • Price

    Price on request   ≥1piece

  • Model Number

    H2S-A4

  • Data Sheet

  • Package

    Original packaging

  • Specs

    H2S-A4

  • Quantity

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Product Description

H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) Description
Alphasense Hydrogen Sulfide gas sensors operate using well-known fuel cell technology.

H2S-A4 Hydrogen Sulfide Sensor size:
20mm diameter, the industry standard size for 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-A4 Hydrogen Sulfide Sensor (H2S Sensor) PERFORMANCE
Sensitivity
 nA/ppm at 2ppm H2S
 1400 to 1850
Response time
 t90 (s) from zero to 2ppm H2S
 < 45
Zero current
 nA in zero air at 20°C
 -250 to 100
Noise*
 ±2 standard deviations (ppb equivalent)
 5
Range
 ppm H2S limit of performance warranty
 50
Linearity
 ppb error at full scale, linear at zero and 10ppm H2S
 < ± 0.5
Overgas limit
 maximum ppm for stable response to gas pulse
 100
* Tested with Alphasense AFE low noise circuit



H2S-A4 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-A4 Hydrogen Sulfide Sensor (H2S Sensor) ENVIRONMENTAL
Sensitivity @ -20°C
 (% output @ -20°C/output @ 20°C) @ 2ppm H2S 
 80 to 92
Sensitivity @ 50°C
 (% output @ 50°C/output @ 20°C) @ 2ppm H2S
 100 to 110
Zero @ -20°C
 nA change from 20°C
 30 to 50
Zero @ 50°C
 nA change from 20°C
 90 to 110



H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) CROSS SENSITIVITY 
NO2  sensitivity
 % measured gas @ 5ppm NO2
 < -20
Cl2    sensitivity
 % measured gas @ 5ppm Cl2
 < -8
NO    sensitivity
 % measured gas @ 5ppm NO
 < 3
SO2   sensitivity
 % measured gas @ 5ppm SO2
 < 15
CO     sensitivity
 % measured gas @ 5ppm CO
 < 1
H2     sensitivity
 % measured gas @ 100ppm H2 
 < 0.5
C2H4 sensitivity
 % measured gas @ 100ppm C2H4
 < 0.5
NH3   sensitivity
 % measured gas @ 5ppm NH3
 < 0.1
CO2   sensitivity
 % measured gas @ 5% CO2
 < 0.1



H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) KEY SPECIFICATIONS 
Temperature range
 °C
 -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 (AFE circuit is recommended)
 33 to 100
Weight
 g
 < 6


Matched Transmitter board for H2S-A4 H2S Sensor

Analogue Front End (AFE) Alphasense A4 Air Quality Sensors
The family of Analogue Front End (AFE) circuits are designed for use with the A4 air quality sensors. Connect the AFE with A4 sensors to your multtiplexed ADC and you are recording air quality data immediately.