Nitric Oxide Sensor (NO Sensor) - NO-A1

• Range: 250 ppm NO limit of performance warranty
• Sensitivity: 320 to 480 nA/ppm in 50ppm NO
• Response time t90: < 45s from zero to 50ppm NO
• Resolution: < 0.2 RMS noise (ppm equivalent)
• Temperature range: -30 to 50°C
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 % rh continuous
• Weight: < 6 g

  • Model Number: NO-A1
  • Data Sheet: Date Sheet File
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  • Nitric Oxide Sensor (NO Sensor)
  • Nitric Oxide Sensor (NO Sensor)
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Product Specification

NO-A1 Nitric Oxide Sensor (NO Sensor) Description
Alphasense Nitric Oxide gas sensors operate using proven fuel cell technology.

NO-A1 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-A1 Nitric Oxide Sensor NO sensor Schematic Diagram

NO-A1 Nitric Oxide Sensor NO sensor PERFORMANCE
nA/ppm in 50ppm NO
320 to 480
Response time
t90 (s) from zero to 50ppm NO
< 45
Zero current
ppm equivalent in zero air
0 to +2
RMS noise (ppm equivalent)
< 0.2
ppm NO limit of performance warranty
ppm error at full scale, linear at zero and 50ppm NO
+15 to +25
Overgas limit
maximum ppm for stable response to gas pulse

NO-A1 Nitric Oxide Sensor NO sensor LIFETIME
Zero drift
ppm equivalent change/year in lab air
< 0.3
Sensitivity drift
% change/year in lab air, monthly test
< 5
Operating life
months until 80% original signal (24 month warranted)
> 24

NO-A1 Nitric Oxide Sensor NO sensor ENVIRONMENTAL
Sensitivity @ -20°C
% (output @ -20°C/output @ 20°C) @ 50ppm
83 to 94
Sensitivity @ 50°C
% (output @ 50°C/output @ 20°C) @ 50ppm
98 to 104
Zero @ -20°C
ppm equivalent change from 20°C
< 0 to -1
Zero @ 50°C
ppm equivalent change from 20°C 
< 3 to 16

NO-A1 Nitric Oxide Sensor NO sensor CROSS SENSITIVITY
H2S sensitivity
% measured gas @ 20ppm H2S
< 30
NO2 sensitivity
% measured gas @ 50ppm NO2
< 5
Cl2 sensitivity
% measured gas @ 10ppm Cl2
< 15
SO2 sensitivity
% measured gas @ 20ppm SO2
< 3
H2 sensitivity
% measured gas @ 400ppm H2
< 0.1
CO sensitivity
% measured gas @ 400ppm CO
< 0.1
NH3 sensitivity
% measured gas @ 20ppm NH3
< 0.1
CO2 sensitivity
% measured gas @ 5% Vol CO2
< 0.1

NO-A1 Nitric Oxide Sensor NO sensor KEY SPECIFICATIONS
Bias voltage
mV (working electrode potential is above ground)
Temperature range
-30 to 50
Pressure range
80 to 120
Humidity range
% rh continuous
15 to 90
Storage period
months @ 3 to 20°C (stored in sealed pot)
Load resistor
Ω (recommended)
10 to 47
< 6

Matched Transmitter board for NO-A1 NO 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

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