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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: Date Sheet File
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  • Ozone + Nitrogen Dioxide Sensor (O3 + NO2 Sensor) 4-Electrode
  • Ozone + Nitrogen Dioxide Sensor (O3 + NO2 Sensor) 4-Electrode
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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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The family of Analogue Front End (AFE) circuits are designed for use with the A4 air quality sensors. Connect the AFE with A4 sensors to your multtiplexed ADC and you are recording air quality data immediately.

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