SO2-B4 Sulfur Dioxide Sensor 4-Electrode

PERFORMANCE  
Sensitivity             nA/ppm at 2ppm SO2                                                275 to 475
Response time      t90 (s) from zero to 2ppm SO2                                          < 30
Zero current         nA in zero air at 20℃                                               -80 to +80
Noise*                ±2 standard deviations (ppb equivalent)                                  5
Range                 ppm limit of performance warranty                                      100
Linearity              ppb error at 100ppm SO2 , linear at zero and 10ppm SO2  0 to -2
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                          < ±20
Sensitivity drift     % change/year in lab air, monthly test                        < ±15
Operating life      months until 50% original signal  (24 month warranted)  > 36

ENVIRONMENTAL  
Sensitivity at -20℃ (% output at -20℃/output at 20℃) at 2ppm SO2             70 to 82
Sensitivity at 50℃  (% output at 50℃/output at 20℃) at 2ppm SO2              95 to 110
Zero at -20℃         nA change from 20℃                                                      0 to -10
Zero ay 50℃          nA change from 20℃                                                     10 to 30

CROSS SENSITIVITY
Filter capacity     ppm·hrs 450
H2S                   sensitivity % measured gas at 5ppm H2S                      < 2
NO2                  sensitivity % measured gas at 5ppm NO2                  < -160
Cl2                    sensitivity % measured gas at 5ppm Cl2                     < -40
NO                    sensitivity % measured gas at 5ppm NO                      < -2
CO                    sensitivity % measured gas at 5ppm CO                        < 2
H2                    sensitivity % measured gas at 100ppm H2                  < 0.5
C2H4                sensitivity % measured gas at 100ppm C2H4                  < 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 continuous (see note below)                 15 to 90
Storage period        months at 3 to 20°C (stored in sealed pot)              6
Load Resistor          Ω (ISB circuit is recommended)                  33 to 100
Weight                   g                                                                   < 13