CO-A4 Carbon Monoxide Sensor 4-Electrode

Temperature range :-30 to 50 ℃
Pressure range : 80 to 120 kPa
Humidity range :15 to 90 % rh continuous
Storage period : 6 months @ 3 to 20 ℃ (stored in sealed pot)
Load resistor :33 to 100 Ω (AFE circuit is recommended)
Weight : < 6g

• Model Number: CO-A4
• Data Sheet:
• category: Sensors | Gas Sensors | Electrochemical Sensors

Product Specification

CO-A4 Carbon Monoxide Sensor 4-Electrode

PERFORMANCE
Sensitivity              nA/ppm in 2ppm CO                                           220 to 375
Response time       t90 (s) from zero to 10ppm CO                                     < 20
Zero current          nA in zero air at 20℃                                         -100 to +10
Noise*                  ±2 standard deviations (ppb equivalent)                           20
Range                   ppm limit of performance warranty 500
Linearity                ppm CO error at full scale, linear at zero, 15ppm CO    < ± 1
Overgas limit         maximum ppm for stable response to gas pulse 2000
* Tested with Alphasense AFE 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 @ -20℃ (% output @ -20℃/output @ 20℃) @ 5ppm CO        50 to 85
Sensitivity @ 50℃  (% output @ 50℃/output @ 20℃) @ 5ppm CO       110 to 125
Zero @ -20℃        nA change from 20℃                                                10 to 40
Zero @ 50℃         nA change from 20℃                                           -120 to -200

CROSS SENSITIVITY
Filter capacity       ppm·hrs H2S                                               250,000
H2S sensitivity      % measured gas @ 5ppm H2S                         < 0.1
NO2 sensitivity     % measured gas @ 5ppm NO2                          < -2
Cl2 sensitivity       % measured gas @ 5ppm Cl2                          < 0.1
NO sensitivity       % measured gas @ 5ppm NO                           < -2
SO2 sensitivity      % measured gas @ 5ppm SO2                        < 0.1
H2 sensitivity        % measured gas @ 100ppm H2  at 20℃           < 10
C2H4 sensitivity    % measured gas @ 100ppm C2H4                   < 0.5
NH3 sensitivity     % measured gas @ 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 @ 3 to 20 ℃ (stored in sealed pot)              6
Load resistor            Ω (AFE circuit is recommended)                  33 to 100
Weight                    g                                                                      < 6