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HCl sensor

Hydrogen chloride

Reliable real-time
information on HCl

GasPlug TECHNOLOGY | PATENTED DESIGN

Hydrogen chloride - Smart gas cartridge
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Where is it found?

Hydrogen chloride (HCl) is a colourless to slightly yellow gas with a pungent odour. Upon contact with air, it forms dense, corrosive white vapours. It’s naturally found in the digestive systems of most mammals and as a byproduct of various industrial processes. HCl is primarily used for synthesising inorganic and organic chemicals such as chlorine, ethylene dichloride, and methyl chloride.

It is used in applications such as fumigation, electroplating, mining, chemical synthesis, and the production of synthetic fibres, plastics, dyes, and pesticides.

Why is it harmful?

Hydrogen chloride is irritating and corrosive to any tissue with which it comes into contact. Brief exposure at low levels can irritate the skin, nose, eyes, throat, and larynx, as well as eye and skin burns. Longer exposure causes syndromes of severe respiratory failure and death.

Its odour threshold was set as 0.77 ppm, while the irritating concentration has been reported as 33 ppm.

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HCl cartridge

The hydrogen chloride cartridge has a built-in electrochemical sensor capable of monitoring low concentrations (< 1 ppm) as well as high concentrations of HCl, up to 20 ppm, and an accuracy of ±0.3 ppm. The HCl cartridge has a high cross-sensitivity with H2S, it is therefore recommended to use an H2S cartridge together with the HCl cartridge, when high H2S concentrations are present (at ppm level), allowing the Kunak algorithm to correct this cross-sensitivity to obtain the highest precision.

The HCl cartridge is recommended for leak detection in industrial processes, and not for continuous HCl monitoring.

​Technical specifications

Type
Electrochemical
Unit of measurement
mg/m3, ppm
Measurement range(1)
0 - 20 ppm
Resolution(2)
0.01 ppm
Operating temperature range(3)
-20 to 50ºC
Operating RH range(4)
0 to 99 %RH
Recommended RH range(4)
15 to 90 %RH
Operating life(5)
> 24 months
Guarantee range(6)
200 ppm
Limit of Detection (LOD)(7)
0.01 ppm
Repeatability(8)
0.02 ppm
Response time(9)
< 45 sec
Typical accuracy(11) (12)
± 0.1 ppm
Typical precision R2 (10)
-
Typical slope(10)
-
Typical intercept (a)(10)
-
DQO - Typical U(exp)(13)
-
Typical Intra-model variability(14)
< 0.1 ppm
  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