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UK Alphasense High-Resolution Ozone Sensor (O3 Sensor) 4-Electrode OX-B431 OX-B431+

UK Alphasense High-Resolution Ozone Sensor (O3 Sensor) 4-Electrode - OX-B431 OX-B431+

High resolution up to 15ppb
Good linearity up to 0.5ppm
High sensitivity up to -550nA/ppm

Product Model: OX-B431 OX-B431+

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Product Introduction

I. UK Alphasense High-ResolutionOzone Sensor(O3 Sensor) OX-B431 OX-B431+ Description

The UK Alphasense High-Resolution Ozone Sensor (O3 Sensor)OX-B431can simultaneously detect O3 and NO2 (O3+NO2), butNO2-B43Fcan only measure NO2 and filter out O3. By using both sensors together, subtract the calibrated NO2-B43F concentration from the calibrated OX-B431 concentration to obtain the O3 concentration. The ozone sensor OX-B431 has a range of 0~20ppm and can detect ozone concentrations as low as 15ppb, making it ideal for ambient air quality monitoring systems and instruments.

Before performing the subtraction to determine O3 concentration, ensure that the electronic zero offset, sensor zero offset, temperature characteristics, sensitivity (nA/ppm), and sensitivity temperature characteristics of both sensor signals have been calibrated.

The OX-B431 sensor is a PPB sensor designed for ambient air quality applications with excellent baseline stability. This product is available in standard format (OX-B431) and a version with our patented integrated smart technology (OX-B431+), which integrates an IST board with memory chip and temperature sensor into the sensor. The + sensor stores specific calibration, specification, and identification data on each sensor, allowing plug-and-play operation. The onboard temperature sensor improves the accuracy and ease of temperature compensation algorithms.

II.UK Alphasense High-Resolution Ozone Sensor（O3 Sensor） OX-B431Technical Parameters for Ozone Detection
Response Time: < 45s
Dimensions: Φ32.3×16.5
Ozone Detection Range: 20ppm
Overload: 50ppm

Sensitivity: -225 to -550 nA/ppm

III.、Ozone Sensor (O3 Sensor) + Nitrogen Dioxide Sensor (NO2 Sensor)OX-B431 Applications

Ambient air quality trace ozone monitoring, ozone gas transmitters.

UK Alphasense High-ResolutionOzone Sensor(O3 Sensor) OX-B431 OX-B431+ Dimensions:

IV. OX-B431 Ozone Sensor (O3 Sensor) Parameters:

Sensitivity	Sensitivity at 1ppm O3 (nA/ppm)	-225~ -750
Response Time	t90 time from zero to 1ppm O3 (s)	<80
Zero Current	Output in zero air at 20°C (nA)	-80~80
Noise*	Standard deviation ±2 (equivalent ppb)	15
Range	Measurement limit ensuring product performance (ppm)	20
Linearity	ppm error over full scale, linear at 0~20ppm	<±0.5
Overload	Maximum ppm for stable response to gas pulses	50
*Tested using Alphasense	ISB low-noise circuit board

V. OX-B431 Ozone Sensor (O3 Sensor) Lifetime:

Zero Drift	Equivalent ppb change per year in laboratory air	0~20
Sensitivity Drift	Percentage change per year in laboratory air, measured monthly	<-20~-40
Operating Life	Months until output drops to 50% of original signal (24-month warranty)	>24

VI. OX-B431 Ozone Sensor (O3 Sensor) Environmental

Sensitivity at -20°C	At 2ppm O3, (% of output at -20°C / output at 20°C)	70~90
Sensitivity at 40°C	At 2ppm O3, (% of output at 40°C / output at 20°C)	95~125
Zero at -20°C	nA	0~25
Zero at 40°C	nA	5~100

VII. OX-B431 Ozone Sensor (O3 Sensor) Cross-Sensitivity:

H2S	Percentage sensitivity to measured gas at 5ppm H2S	<-80
NO	Percentage sensitivity to measured gas at 5ppm NO	<5
Cl2	Percentage sensitivity to measured gas at 5ppm Cl2	<100
SO2	Percentage sensitivity to measured gas at 5ppm SO2	<-3
CO	Percentage sensitivity to measured gas at 5ppm CO	<-3
C2H4	Percentage sensitivity to measured gas at 100ppm C2H4	<0.1
NH3	Percentage sensitivity to measured gas at 20ppm NH3	<0.1
H2	Percentage sensitivity to measured gas at 100ppm H2	<0.1
CO2	Percentage sensitivity to measured gas at 5%Vol CO2	0.1
Halothane	Percentage sensitivity to measured gas at 100ppm halothane	<0.1

VIII. OX-B431 Ozone Sensor (O3 Sensor) Key Parameters

Temperature Range	℃	-30~40
Pressure Range	Kpa	80~120

UK Alphasense High-ResolutionOzone Sensor(O3 Sensor) OX-B431 OX-B431+ IST Board Data:

IX.OX-B431 Ozone Sensor (O3 Sensor)Compatible Sensor Board:

Individual Sensor Board (ISB) Alphasense B4 4-Electrode Gas Sensor - ISB

This individual sensor board (ISB) is used for Alphasense B4 series four-electrode gas sensors. The regulator provides dual-channel voltage output.

The low-noise bandgap provides bias voltage to NO sensors, while the ISB can measure oxidizing (CO, H2S, SO2, and NO) and reducing (O3 and NO2) gases.

The ISB is configured in four versions for specific sensors: NO, NO2, O3, and CO/H2S/SO2.