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NO2 sensor

Nitrogen dioxide

Reliable real-time
data on NO2

GasPlug TECHNOLOGY | PATENTED DESIGN

Nitreogen_dioxide
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Where is it found?

The major source of NO2 is the combustion of fossil fuels: coal, oil and gas. Most of the NO2 in cities is derived from motor vehicle exhausts.

Other sources of NO2 are petrol and metal refining, electricity generation from coal-fired power stations, other manufacturing industries and food processing.

Why is it harmful?

Nitrogen dioxide (NO2) is a pollutant criterion that contri- butes to the formation of photochemical smog, which has significant impact on human health.

Breathing increased levels of NO2 inflames the lining of the lungs and reduces immunity to lung infections. The result is wheezing, coughing, colds, flu and bronchitis, as well as more frequent and intense asthma attacks.

The Nitrogen Dioxide Cartridge has a built-in electrochemical sensor which has no interference with Ozone thanks to its embedded O3 filter, making the cartridge ideal to measure the concentrations found in the atmosphere, from very low levels in clean environments to high concentrations in polluted areas of cities or industries.

However, the cartridge can be affected by fast humidity transients reducing its accuracy during these events.

Technical specifications

Type
Electrochemical
Unit of measurement
µg/m3, ppb
Measurement range(1)
0-5,000 ppb
Resolution(2)
1 ppb
Operating temperature range(3)
-30 to 45ºC
Operating RH range(4)
0 to 99 %RH
Recommended RH range(4)
15 to 85 %RH
Operating life(5)
> 24 months
Guarantee range(6)
20 ppm
Limit of Detection (LOD)(7)
2 ppb
Repeatability(8)
4 ppb
Response time(9)
< 60 sec
Typical accuracy(11) (12)
± 5 ppb
Typical precision R2 (10)
> 0.85
Typical slope(10)
0.78 - 1.29
Typical intercept (a)(10)
-4 ppb ≤ a ≤ +4 ppb
DQO - Typical U(exp)(13)
< 25%
Typical Intra-model variability(14)
< 1 ppb
  1. Measurement range: concentration range measured by the sensor.
  2. Resolution: the smallest unit of measurement that can be indicated by the sensor.
  3. Operating temperature range: temperature interval at which the sensor is rated to operate safely and provide measurements.
  4. Operating RH range (Recommended RH range): humidity interval at which the sensor is rated to operate safely and provide measurements.
  5. Operating life: lifetime of the sensor at normal conditions.
  6. Guarantee range: limit covered by the guarantee.
  7. 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, based on the metric from the Technical Specification CEN/TS 17660-1:2022.
  8. 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, based on the metric from the Technical Specification CEN/TS 17660-1:2022.
  9. Response time: time needed by the sensor to reach 90% of the final stable value.
  10. Statistical metric: statistics obtained between the device hourly measurements and reference instruments for 1 to 8 months field test between -10 to +30ºC in different countries. (*) The expected error for PM10 is higher in the presence of coarse particles.
  11. Mean Absolute Error: it is the average mean absolute error (MAE) obtained between the device hourly measurements and reference instruments for 1 to 8 months of field test between -10 to +30ºC in different countries.
  12. Error: it is the error of the sensor at reading measurement or full scale.
  13. DQO-Typical U(exp): Data Quality Objective expressed as the Expanded Uncertainty in the Limit Value obtained between hourly measurements of the device and the reference instruments for 1 to 8 months field test between -10 to +30ºC in different countries, based on the metric from the European Air Quality Directive 2008/50/EC and from the Technical Specification CEN/TS 17660-1:2022. (*) The expected error for PM10 is higher in the presence of coarse particles.
  14. 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.

It is essential to have an instrument that is capable of accurately measuring pollution levels and providing reliable results to make informed decisions on air quality and public health.

Javier Fernández

CEO & Co-founder - Kunak