OX-B431 Ozone and Nitrogen Dioxide Sensor
O3 / NO2 Gas Sensor, Electrochemical, B-Series, ppb-level fixed monitoring
High-capacity O3 / NO2 ppb sensor for robust fixed and outdoor installations
The OX-B431 is a B-Series 4-electrode oxidising gas sensor that measures combined ozone and nitrogen dioxide at ppb-levels, optimised for fixed AQ networks and harsh environments. The larger B-Series package offers higher electrolyte volume and enhanced stability for long-term outdoor use. OX-B431 is typically paired with NO2-B43F to separate O3 and NO2 channels in regulatory and research-grade monitoring. It’s well suited to roadside stations, industrial perimeters and urban background sites.
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Key Specifications:
|
Sensor Model |
Target Gas |
Technology / Package |
Concentration Range |
Typical Sensitivity (O3 / NO2) |
T90 Response Time |
Operating Life |
|
OX-B431 |
Ozone (O3) / Nitrogen Dioxide (NO2) |
Electrochemical, B-Series, 4-electrode |
0 – 20 ppm O3; 0 – 20 ppm NO2 (ppb-level resolution) |
O3: –225 to –750 nA / ppm at 1 ppm |
< 80 s (typical) |
> 24 months (24 - month warranted) |
|
Feature |
Benefit |
|
B-Series ppb oxidising sensor |
Larger electrolyte volume and robust mechanics for demanding fixed installations. |
|
Combined O3 + NO2 channel |
Reduces sensor population per node in multi-pollutant AQ networks. |
|
Designed to pair with NO2-B43F |
Supports accurate O3 calculation via differential NO2 measurement. |
|
OX-B431+ IST variant |
I2C - addressable smart sensor with on-board temperature sensing and calibration data storage. |
|
PPB-level noise with ISB+ |
When used with B+ ISB+ boards, achieves low noise suitable for regulatory AQ networks. |
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Technical Datasheet
Application Notes
- O3 / NO2 AQ deployment strategies in Alphasense Air Quality Product Guide.
Design Considerations
- Use with ISB boards for digital, low-noise output.
- Use IST variant for integrated temperature compensation.
Safety Documents
- Guidance on oxidising toxic gas handling and fixed system design in Alphasense Gas Safety Product Guide
Related Products
- Accessories:
- ISB – Individual Sensor Boards
- O-ring
- Dust Filter
- Gas Hoods
- Frequently Bought Together:
- NO2-B43F ppb NO2 sensor for O3 and NO2 separation.