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 at -20℃  (% output at -20°C/output at 20℃) at 2ppm H2S      77 to 90
Sensitivity at 50℃   (% output at 50°C/output at 20℃) at 2ppm H2S    100 to 110
Zero at -20℃          nA change from 20℃   50 to 60
Zero at 50℃           nA change from 20℃   -120 to -160

CROSS SENSITIVITY
NO2   sensitivity   % measured gas at 5ppm NO2                < -10
Cl2     sensitivity   % measured gas at 5ppm Cl2                  < -12
NO     sensitivity   % measured gas at 5ppm NO                   < 12
SO2   sensitivity   % measured gas at 5ppm SO2                 < 20
CO     sensitivity   % measured gas at 5ppm CO                     < 3
H2      sensitivity   % measured gas at 100ppm H2               < 0.5
C2H4 sensitivity   % measured gas at 100ppm C2H4           < 0.1
NH3   sensitivity   % measured gas at 20ppm NH3               < 0.1
CO2   sensitivity   % measured gas at 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 at 3 to 20℃ (stored in sealed pot)     6
Load resistor             Ω (ISB circuit is recommended)         33 to 100
Weight                       g                                                               < 13