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Ozone + Nitrogen Dioxide Sensor (O3 + NO2 Sensor) 4-Electrode - OX-A431

? Range: 20 ppm O3 limit of performance warranty
? Range: 20 ppm NO2 limit of performance warranty
? Sensitivity: -200 to -550 nA/ppm at 1ppm O3
? Sensitivity: -200 to -550 nA/ppm at 2ppm NO2
? Response time t90: < 45 (s) from zero to 1ppm O3
? Response time t90: < 45 (s) from zero to 1ppm NO2
? Temperature range: -30 to 40 ℃
? Pressure range: 80 to 120 kPa
? Humidity range: 15 to 85 % rh continuous

Model Number: OX-A431
Data Sheet:

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Product Specification

OX-A431 Oxidising Gas Sensor
Ozone + Nitrogen Dioxide
4-Electrode

Ozone Sensor O3 Sensor Specification

Ozone Sensor PERFORMANCE
Sensitivity	nA/ppm at 1ppm O3	-200 to -550
Response time	t90 (s) from zero to 1ppm O3	< 45
Zero current	nA in zero air at 20°C	-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

Ozone 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

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

Ozone Sensor 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

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

Nitrogen Dioxide Sensor NO2 Sensor Specification

NO2 Sensor 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°C	-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

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

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

NO2 Sensor 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

NO2 Sensor KEY SPECIFICATIONS
Temperature range	°C	-30 to 40
Pressure range	kPa	80 to 120
Humidity range	% rh continuous	15 to 85

Matched Transmitter board for OX-A431 Oxidising Gas Sensor

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