Home | Sensors&Transmitters| Gas Sensor| Electrochemical Gas Sensors

Nitric Oxide Sensor (NO Sensor) 4-Electrode - NO-A4

Mouse over image to zoom

• Range: 20ppm NO limit of performance warranty
• Sensitivity: 250 to 425nA/ppm in 2ppm NO
• Response time t90: < 25(s) from zero to 2ppm NO
• Temperature range :-30 to 50 ℃
• Pressure range : 80 to 120 kPa
• Humidity range :15 to 85 % rh continuous
• Weight :< 6 g

Model Number: NO-A4
Data Sheet:

Quantity:: - +

Inquire Now Add to cart

Product Specification

NO-A4 Nitric Oxide Sensor (NO Sensor) Description
Alphasense Nitric Oxide gas sensors operate using proven fuel cell technology.

NO-A4 Nitric Oxide Sensor size:
20mm diameter, the industry standard size for portable gas detectors

The NO 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 200 parts per billion (ppb) whilst giving linear outputs to as high as 250ppm. The sensors are suitable for inclusion in fixed installation sensing heads, portable safety instruments, urban air monitoring and stack gas analysers.

Alphasense NO sensors provide a significant improvement in stability of response to transient relative humidity changes.

The NO 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.

NO-A4 Nitric Oxide Sensor PERFORMANCE
Sensitivity	nA/ppm in 2ppm NO	250 to 425
Response time	t90 (s) from zero to 2ppm NO	< 25
Zero current	nA in zero air at 20℃	10 to 80
Noise*	±2 standard deviations (ppb equivalent)	80
Range	ppm NO limit of performance warranty	20
Linearity	ppb error at full scale, linear at zero and 5ppm NO	< ±1
Overgas limit	maximum ppm for stable response to gas pulse	50
* Tested with Alphasense AFE low noise circuit

NO-A4 Nitric Oxide Sensor LIFETIME
Zero drift	ppb equivalent change/year in lab air	0 to 50
Sensitivity drift	% change/year in lab air, monthly test	0 to -20
Operating life	months until 50% original signal (24 month warranted)	> 24

NO-A4 Nitric Oxide Sensor ENVIRONMENTAL
Sensitivity @ -20℃	(% output @ -20℃/output @ 20℃) @ 2ppm NO	35 to 60
Sensitivity @ 50℃	(% output @ 50℃/output @ 20℃) @ 2ppm NO	120 to 135
Zero @ -20℃	nA change from 20℃	-10 to -50
Zero @ 50℃	nA change from 20℃	200 to 350

NO-A4 Nitric Oxide Sensor CROSS SENSITIVITY
H2S sensitivity	% measured gas @ 5ppm H2S (after 3 minutes)	< 20
NO2 sensitivity	% measured gas @ 5ppm NO2 (after 3 minutes)	< 7
Cl2 sensitivity	% measured gas @ 5ppm Cl2	< 4
SO2 sensitivity	% measured gas @ 5ppm SO2	< 4
H2 sensitivity	% measured gas @ 100ppm H2	< 0.1
CO sensitivity	% measured gas @ 5ppm CO	< 0.3
NH3 sensitivity	% measured gas @ 5ppm NH3	< 0.1
CO2 sensitivity	% measured gas @ 5% Vol CO2	< 0.1
Halothane sensitivity	@ 100ppm Halothane	< 0.1

NO-A4 Nitric Oxide Sensor KEY SPECIFICATIONS
Bias voltage	mV (working electrode potential is above reference electrode)	+200
Temperature range	℃	-30 to 50
Pressure range	kPa	80 to 120
Humidity range	% rh continuous	15 to 85
Storage period	months @ 3 to 20℃ (stored in sealed pot)	6
Load resistor	Ω (AFE circuit is recommended)	33 to 100
Weight	g	< 6

Matched Transmitter board for NO-A4 NO Sensor

Analogue Front End (AFE) Alphasense A4 Air Quality Sensors
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.