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 20â?? -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 @ -20â?? (% output @ -20â??/output @ 20â??) @ 2ppm SO2 70 to 82
Sensitivity @ 50â?? (% output @ 50â??/output @ 20â??) @ 2ppm SO2 95 to 110
Zero @ -20â?? nA change from 20â?? 0 to -10
Zero @ 50â?? nA change from 20â?? 10 to 30
CROSS SENSITIVITY
Filter capacity ppm·hrs 450
H2S sensitivity % measured gas @ 5ppm H2S < 2
NO2 sensitivity % measured gas @ 5ppm NO2 < -160
Cl2 sensitivity % measured gas @ 5ppm Cl2 < -40
NO sensitivity % measured gas @ 5ppm NO < -2
CO sensitivity % measured gas @ 5ppm CO < 2
H2 sensitivity % measured gas @ 100ppm H2 < 0.5
C2H4 sensitivity % measured gas @ 100ppm C2H4 < 1
NH3 sensitivity % measured gas @ 20ppm NH3 < 0.1
CO2 sensitivity % measured gas @ 5% CO2 < 0.1
KEY SPECIFICATIONS
Temperature range â?? -30 to 50
Pressure range kPa 80 to 120
Humidity range % rh continuous (see note below) 15 to 90
Storage period months @ 3 to 20°C (stored in sealed pot) 6
Load Resistor ohm (ISB circuit is recommended) 33 to 100
Weight g < 13
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