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Ozone Sensor + Nitrogen Dioxide Sensor (O3 Sensor + NO2 Sensor) - OX-B431

  • Ozone Sensor + Nitrogen Dioxide Sensor (O3 Sensor + NO2 Sensor)
  • Ozone Sensor + Nitrogen Dioxide Sensor (O3 Sensor + NO2 Sensor)
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• Sensitivity: -225 to -550 nA/ppm at 1ppm O3
• Sensitivity: -250 to -650 nA/ppm at 2ppm NO2
• Response time: < 45 t90 (s) from zero to 1ppm O3
• Range: 20 ppm O3/NO2 limit of performance warranty
• Temperature range: -30 to 40 ℃
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 85 % rh continuous

  • Model Number: OX-B431
  • Data Sheet: Date Sheet File
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Product Specification

OX-B431 O3 Sensor + NO2 Sensor Description
Alphasense is expanding its line of electrochemical toxic gas sensors to address industry-specific requirements, including emissions monitoring, process safety, environmental monitoring and VOCs.

Ozone (O3)

The new O3-B4 measures Ozone at low ppb concentrations. Low sensitivity to SO2 and repeatable sensitivity to NO2.


OX-B431 O3 Sensor + NO2 Sensor Features

  1. High resolution up to 15ppb
  2. Short response time of 45s
  3. Linear output, excellent linearity
  4. Little zero drift


OX-B431 O3 Sensor Specification
OX-B431 O3 Sensor PERFORMANCE
Sensitivity  nA/ppm at 1ppm O3 -225 to -550
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



OX-B431 O3 Sensor 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



OX-B431 O3 Sensor ENVIRONMENTAL
Sensitivity @ -20℃ (% output @ -20℃/output @ 20℃) @ 2ppm O3 70 to 90
Sensitivity @ 40℃  (% output @ 40℃/output @ 20℃) @ 2ppm O3 95 to 125
Zero @ -20℃ nA 0 to 25
Zero @ 40℃ nA 5 to 100



OX-B431 O3 Sensor CROSS SENSITIVITY
H2S sensitivity % measured gas @ 5ppm H2S < 170
NO sensitivity % measured gas @ 5ppm NO < 5
Cl2 sensitivity % measured gas @ 5ppm Cl2 < 90
SO2 sensitivity % measured gas @ 5ppm SO2 < -7
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



OX-B431 O3 Sensor 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


OX-B431 NO2 Sensor Specification


OX-B431 NO2 Sensor PERFORMANCE
Sensitivity to NO2 nA/ppm at 2ppm NO2 -250 to -650
Response time t90 (s) from zero to 2ppm NO2 < 35
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



OX-B431 NO2 Sensor 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



OX-B431 NO2 Sensor ENVIRONMENTAL
Sensitivity @ -20℃ (% output @ -20℃/output @ 20℃) @ 2ppm NO2 70 to 90
Sensitivity @ 40℃ (% output @ 50℃/output @ 20℃) @ 2ppm NO2 95 to 110
Zero @ -20℃ nA 0 to 25
Zero @ 40℃ nA 5 to 50



OX-B431 NO2 Sensor CROSS SENSITIVITY 
H2S sensitivity % measured gas @ 5ppm H2S < 170
NO sensitivity % measured gas @ 5ppm NO < 5
Cl2 sensitivity % measured gas @ 5ppm Cl2 < 90
SO2 sensitivity % measured gas @ 5ppm SO2 < -7
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



OX-B431 NO2 Sensor KEY SPECIFICATIONS
Temperature range ℃ -30 to 40
Pressure range kPa 80 to 120
Humidity range % rh continuous 15 to 85
Weight g < 6

Matched Transmitter board for OX-B431

Individual Sensor Board (ISB) Alphasense B4 4-Electrode Gas Sensors
The Individual Sensor Board (ISB) is designed for use with the Alphasense B4 family of four-electrode gas sensors. This potentiostat provides a dual channel voltage output.
A low noise bandgap provides the bias voltage for NO sensors and the ISB can measure both oxidising (CO, H2S, SO2 and NO) and reducing (O3 and NO2) gases.
The ISB is configured for specific sensors: NO, NO2, O3 and CO / H2S / SO2 .
Designed for low power applications, the ISB requires 3.5 to 6.4 stable DC supply at only 1mA.

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