CO-B4 Carbon Monoxide Sensor 4-Electrode

PERFORMANCE 
Sensitivity           nA/ppm at 2ppm CO                                        420 to 650
Response time   t90 (s) from zero to 10ppm CO                                 < 25
Zero current       nA in zero air at 20℃                                     +30 to -130
Noise*                 ±2 standard deviations (ppb equivalent)                       4
Range                 ppm limit of performance warranty                          1000
Linearity              ppb CO error at full scale, linear at zero, 500ppm CO      20 to 35
Overgas limit       maximum ppm for stable response to gas pulse               2000
* 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                      < 10
Operating           life months until 50% original signal (24 month warranted)  > 36

ENVIRONMENTAL 
Sensitivity at -20℃ (% output @ -20℃/output at 20℃) at 5ppm CO            40 to 70
Sensitivity at 50℃  (% output @ 50℃/output at 20℃) at 5ppm CO              110 to 125
Zero at -20℃        nA                                                          -30 to +30
Zero at 50℃         nA                                                          -50 to -200

CROSS SENSITIVITY
Filter   capacity     ppm·hrs H2S                                            250,000
H2S     sensitivity  % measured gas at 5ppm H2S                       < 1
NO2    sensitivity  % measured gas at 5ppm NO2                       < 1
Cl2      sensitivity  % measured gas at 5ppm Cl2                          < 1
NO      sensitivity  % measured gas at 5ppm NO                       < -3
SO2    sensitivity  % measured gas at 5ppm SO2                      < 0.1
H2      sensitivity  % measured gas at 100ppm H2  at 20 ℃       < 10
C2H4 sensitivity   % measured gas at 100ppm C2H4                  < 1
NH3   sensitivity   % measured gas at 20ppm NH3                    < 0.1

KEY SPECIFICATIONS 
Temperature range  ℃                                                          -30 to 50
Pressure range        kPa                                                       80 to 120
Humidity range        % rh continuous                                     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