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Output: Analog Sensor
Usage: Gas Sensor
Model Number: H2S-B4
Brand Name: Alphasense
Place of Origin: United Kingdom

Specifications

H2SB4 Hydrogen Sulfide Sensor 4Electrode
H2S-B4 Hydrogen Sulfide Sensor 4-Electrode


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

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

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

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

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