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Nitrogen Dioxide Sensor (NO2 Sensor) - NO2-A1

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• Range: 20 ppm NO2 limit of performance warranty
• Sensitivity: -250 to -650 nA/ppm in 10ppm NO2
• Response time t90: < 50 (s) from zero to 10ppm NO2
• Resolution: < 0.02 RMS noise (ppm equivalent)
• Temperature range : -20 to 50 °C
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 % rh continuous
• Weight: < 6 g

Model Number: NO2-A1
Data Sheet:

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Product Specification

NO2-A1 Nitrogen Dioxide Sensor (NO2 Sensor) Description
Alphasense Nitrogen Dioxide gas sensors operate using proven fuel cell technology.

NO2-A1 Nitrogen Dioxide Sensor size:
20mm diameter, the industry standard size for portable gas detectors

The NO2 range provides OEMs with reliable sensors for use in a number of high volume applications. Strong signal levels combined with low zero current allows resolution to 50 parts per billion (ppb) and an operating range to 20ppm. The sensors are suitable for use in fixed installation sensing heads, portable safety instruments, urban air monitoring and stack gas analysers.

The NO2 sensors offer our electrolyte leak-free guarantee and reliable long-term detection performance. The leakproof housing is moulded with a colour coded top for ease of identification.

NO2-A1 Nitrogen Dioxide Sensor NO2 sensor Schematic Diagram

NO2-A1 Nitrogen Dioxide Sensor NO2 sensor PERFORMANCE
Sensitivity	nA/ppm in 10ppm NO2	-250 to -650
Response time	t90 (s) from zero to 10ppm NO2 (33Ω Load Resistor)	< 50
Zero current	ppm equivalent in zero air	< ± 0.4
Resolution	RMS noise (ppm equivalent) (33Ω Load Resistor)	< 0.02
Range	ppm NO2 limit of performance warranty	20
Linearity	ppm error at full scale, linear at zero and 10ppm NO2	< 1.5
Overgas limit	maximum ppm for stable response to gas pulse	100

NO2-A1 Nitrogen Dioxide Sensor NO2 sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	< 0.05
Sensitivity drift	% change/year in lab air, monthly test	< -20 to -40
Operating life	months until 80% original signal (24 month warranted)	> 24

NO2-A1 Nitrogen Dioxide Sensor NO2 sensor ENVIRONMENTAL
Sensitivity @ -20°C	% (output @ -20°C/output @ 20°C) @ 5ppm NO2	73 to 94
Sensitivity @ 50°C	% (output @ 50°C/output @ 20°C) @ 5ppm NO2	105 to 125
Zero @ -20°C	ppm equivalent change from 20°C	< ± 0.2
Zero @ 50°C	ppm equivalent change from 20°C	< 0 to -0.5

NO2-A1 Nitrogen Dioxide Sensor NO2 sensor CROSS SENSITIVITY
H2S sensitivity	% measured gas @ 20ppm H2S	< -35
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< 80
NO sensitivity	% measured gas @ 50ppm NO	< -5
SO2 sensitivity	% measured gas @ 20ppm SO2	< -15
CO sensitivity	% measured gas @ 400ppm CO	< 0.1
H2 sensitivity	% measured gas @ 400ppm H2	< 0.1
C2H4 sensitivity	% measured gas @ 50ppm C2H4	< 0.1
NH3 sensitivity	% measured gas @ 20ppm NH3	< 0.1
CO2 sensitivity	% measured gas @ 5% volume CO2	< 0.1
O3 sensitivity	% measured gas @ 200ppb O3	< 120

NO2-A1 Nitrogen Dioxide Sensor NO2 sensor KEY SPECIFICATIONS
Temperature range	°C	-20 to 50
Pressure range	kPa	80 to 120
Humidity range	% rh continuous	15 to 90
Storage period	months @ 3 to 20°C (stored in sealed pot)	6
Load resistor	Ω (for optimum performance)	33
Weight	g	< 6

Matched Transmitter board for NO2-A1 NO2 Sensor

4-20mA Digital Transmitter Board
• Factory calibration, custom-set for immediate use
• Digital zero, sensitivity and temperature compensation
• Digital and 4-20mA output
• Biased or unbiased operation
• Calibration and range change