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Oxidising Gas Sensor Ozone + Nitrogen Dioxide 4-Electrode OX-A431
  Name:Oxidising Gas Sensor Ozone + Nitrogen Dioxide 4-Electrode OX-A431
  pattern:OX-A431
  Brand:Alphasense
  Categories:Electrochemical Gas Sensors
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  Documentation: Download

Information:
PERFORMANCE

Sensitivity            nA/ppm at 1ppm O3                      -200 to -650
Response time     t90 (s) from zero to 1ppm O3                   < 45
Zero current        nA in zero air at 20℃                          -50 to 70
Noise*                 ±2 standard deviations (ppb equivalent)      15
Range                 ppm O3  limit of performance warranty         20
Linearity              ppm error at full scale, linear at zero and 20ppm O3 < ±0.5
Overgas limit       maximum ppm for stable response to gas pulse  50
* Tested with Alphasense AFE low noise circuit

LIFETIME 
Zero drift           ppb equivalent change/year in lab air         0 to 20
Sensitivity drift  % change/year in lab air, monthly test       < -20 to -40
Operating life    months until 50% original signal  (24 month warranted) > 24

ENVIRONMENTAL
Sensitivity @ -20℃ (% output @ -20℃/output @ 20℃) @ 2ppm O3  60 to 80
Sensitivity @ 40℃  (% output @ 40℃/output @ 20℃) @ 2ppm O3    80 to 105
Zero @ -20℃          nA    0 to 25
Zero @ 40℃           nA    20 to 90

CROSS SENSITIVITY
H2S            sensitivity % measured gas @ 5ppm H2S                < 100
NO             sensitivity % measured gas @ 5ppm NO                  < 5
Cl2             sensitivity % measured gas @ 5ppm Cl2                  < 85
SO2           sensitivity % measured gas @ 5ppm SO2                 < -6
CO             sensitivity % measured gas @ 5ppm CO                   < 0.1
C2H4         sensitivity % measured gas @ 100ppm C2H4           < 0.1
NH3           sensitivity % measured gas @ 20ppm NH3              < 0.1
H2             sensitivity % measured gas @ 100ppm H2               < 0.1
CO2           sensitivity % measured gas @ 5% Vol CO2              0.1
Halothane sensitivity % measured gas @ 100ppm Halothane    < 0.1

KEY SPECIFICATIONS
Temperature range ℃                                             -30 to 40
Pressure range       kPa                                            80 to 120
Humidity range       % rh continuous                       15 to 85
Storage period       months @ 3 to 20℃(stored in sealed pot) 6
Load resistor          Ω (AFE circuit recommended)    33 to 100
Weight                   g                                               < 6

Specification NO2 Sensing
PERFORMANCE
Sensitivity to NO2  nA/ppm at 2ppm NO2                                       -200 to -550
Response time       t90 (s) from zero to 1ppm NO2                          < 45
Zero current          nA in zero air at 20℃                                          -50 to 70
Noise*                  ±2 standard deviations (ppb equivalent)              15
Range                   ppm NO2 limit of performance warranty              20
Linearity                ppm error at full scale, linear at zero and 20ppm NO2 < ±0.5
Overgas limit         maximum ppm for stable response to gas pulse  50
* Tested with Alphasense AFE low noise circuit

LIFETIME 
Zero drift          ppb equivalent change/year in lab air          0 to 20
Sensitivity drift  % change/year in lab air, monthly test       < -20 to -40
Operating life    months until 50% original signal (24 month warranted) > 24

ENVIRONMENTAL
Sensitivity @ -20℃ (% output @ -20℃/output @ 20℃) @ 2ppm NO2 50 to 80
Sensitivity @ 40℃  (% output @ 50℃/output @ 20℃) @ 2ppm NO2  115 to 130
Zero @ -20℃          nA                0 to 25
Zero @ 40℃           nA                20 to 50

CROSS SENSITIVITY
H2S            sensitivity % measured gas @ 5ppm H2S                   < 100
NO             sensitivity % measured gas @ 5ppm NO                     < 5
Cl2             sensitivity % measured gas @ 5ppm Cl2                     < 85
SO2           sensitivity % measured gas @ 5ppm SO2                   < -6
CO             sensitivity % measured gas @ 5ppm CO                     < 0.1
C2H4         sensitivity % measured gas @ 100ppm C2H4              < 0.1
NH3           sensitivity % measured gas @ 20ppm NH3                  < 0.1
H2             sensitivity % measured gas @ 100ppm H2                  < 0.1
CO2           sensitivity % measured gas @ 5% Vol CO2                 0.1
Halothane sensitivity % measured gas @ 100ppm Halothane       < 0.1

KEY SPECIFICATIONS
Temperature range ℃                          -30 to 40
Pressure range        kPa                        80 to 120
Humidity range       % rh continuous   15 to 85

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