NO nitric oxide sensor

electrochemicalfor air quality monitoringfor real-time measuring

Product Details
Smart cartridge designed by Kunak that integrates a sensor capable of accurately and reliably measuring Nitric oxide levels.

• GasPlug TECHNOLOGY | PATENTED DESIGN

Where is it found?
Nitrogen oxide is emitted from automotive engines and the burning of coal, oil, diesel fuel, and natural gas, especially from electric power plants. It is also emitted by cigarettes, gas stoves, wood burning, and silos that contain silage.

Why is it harmful?
Nitric oxide (NO), also called nitrogen oxide, is a colourless toxic gas originated from the oxidation of nitrogen. It contributes to climate change and its inhalation affects human health. When it reacts with sunlight and other chemicals, such as sulphur dioxide (SO₂), it forms smog and acid rain. The inhalation of high levels of nitric oxide can cause respiratory problems, particularly in vulnerable humans, such as asthmatics, and it is involved in the cardiovascular and immune systems.

NO Cartridge
The nitric oxide cartridge has a built-in electrochemical sensor ideal for measuring very low ppb concentrations in ambient air, up to several ppm found near pollution sources (vehicles, industries…). This cartridge is very accurate and stable, it has a good temperature correction algorithm and can easily work beyond two years under non-extreme environments. The cartridge can suffer from a small zero drift (some ppb) over time, which can be easily corrected remotely with the Kunak Calibration Tool available on Kunak AIR Cloud software.

Technical specifications
Type: Electrochemical
Unit of measurement: µg/m³, ppb
Measurement range: 0-5,000 ppb
Resolution: 1 ppb
Operating temperature range: -30 to 45ºC
Operating RH range: 0 to 99 %RH
Recommended RH range: 15 to 85 %RH
Operating life: > 24 months
Guarantee range: 20 ppm
Limit of Detection (LOD): 2 ppb
Repeatability: 4 ppb
Response time: < 30 sec
Typical accuracy: ± 4 ppb
Typical precision R²: > 0.9
Typical slope: 0.9 - 1.12
Typical intercept (a): -2 ppb ≤ a ≤ +2 ppb
DQO - Typical U(exp): < 20%
Typical Intra-model variability: < 1 ppb

• Measurement range: concentration range measured by the sensor.
• Resolution: smallest unit of measurement that can be indicated by the sensor.
• Operating temperature range: temperature interval at which the sensor is rated to operate safely and provide measurements.
• Operating RH range: humidity interval at which the sensor is rated to operate safely and provide measurements.
• Recommended RH range: Recommended relative humidity range for optimal sensor performance. Continuous exposure outside the recommended range may damage the cartridge.
• Operating life: time period during which the sensor can operate effectively and accurately under normal conditions.
• Guarantee range: concentration range covered by Kunak's guarantee.
• LOD (Limit Of Detection): measured at laboratory conditions at 20ºC and 50% RH. The limit of detection is the minimum concentration that can be detected as significantly different at zero gas concentration, calculated according to the Technical Specification CEN/TS 17660.
• Repeatability: measured at laboratory conditions at 20ºC and 50% RH. Closeness of the agreement between the results of successive measurements of the same measure carried out under the same conditions of measurement, calculated according to the Technical Specification CEN/TS 17660.
• Response time: time needed by the sensor to reach 90% of the final stable value.
• Typical precision - R²: statistics obtained between the device hourly measurements and reference instruments in field test between -10 to +30ºC at different locations.
• Typical accuracy: for criteria pollutants is the average Mean Absolute Error (MAE) obtained between the device hourly measurements and reference instruments for 1 to 8 months field test between -10 to +30ºC in different countries. For other pollutants is the expected error of the measurement at the reading.
• DQO-Typical U(exp): Data Quality Objetive expressed as the Expanded Uncertainty in the Limit Value obtained between the device hourly measurements and reference instruments for 1 to 8 months field test between -10 to +30ºC in different countries, calculated according to the European Air Quality Directive 2024/2881 and from the Technical Specification CEN/TS 17660.
• Typical intra-model variability: calculated as the standard deviation of the three sensor means in 1 to 8 months field test between -10 to +30ºC in different countries.

Characteristics / Technical Specifications

• Type: Electrochemical
• Unit of measurement: µg/m³, ppb
• Measurement range: 0-5,000 ppb
• Resolution: 1 ppb
• Operating temperature range: -30 to 45ºC
• Operating RH range: 0 to 99 %RH
• Recommended RH range: 15 to 85 %RH
• Operating life: > 24 months
• Guarantee range: 20 ppm
• Limit of Detection (LOD): 2 ppb
• Repeatability: 4 ppb
• Response time: < 30 sec
• Typical accuracy: ± 4 ppb
• Typical precision R²: > 0.9
• Typical slope: 0.9 - 1.12
• Typical intercept (a): -2 ppb ≤ a ≤ +2 ppb
• DQO - Typical U(exp): < 20%
• Typical Intra-model variability: < 1 ppb