Carbon dioxide recorder

A carbon dioxide recorder (or CO2 recorder) is a machine that can record the level of carbon dioxide at different times. It is more sophisticated than a carbon dioxide detector which only has to indicate the presence of carbon dioxide. There are three main types of carbon dioxide recorder: chemical, physical, and electrical.

## Contents

* 1 Mechanism
* 1.1 Chemical
* 1.2 Physical
* 1.3 Electrical
* 2 Form
* 3 Application
* 4 References

## Mechanism

### Chemical

The chemical carbon dioxide recorder, sucks the gas through a chemical that absorbs carbon dioxide. They include the Simmance combustion recorder;[1] Hays automatic CO2 recorder, and electroflo CO2 recorder.

The Arndt carbon dioxide recorder used a potassium hydroxide solution to absorb carbon dioxide.[2]

The Uehling recorder uses the chemical, sodium hydroxide to absorb the carbon dioxide, and measures the change in volume of the gas.[3]

### Physical

The physical carbon dioxide recorder, includes Webster CO2 recorder. The Remarex carbon dioxide recorder uses vanes spinning in the gas under test and the air.[4]

### Electrical

Electrical recorders use a thermal conductivity method, where the resistance of a heated wire is measured.[5][6]

## Form

Carbon dioxide recorders can be handheld, or wall mount. They can have an audible or light indicator alarm if level is too high. Units can also measure humidity and temperature.

## Application

Carbon dioxide recorders have been used in schools and hospitals to determine whether enough fresh air is being circulated. A carbon dioxide recorder can be used to measure the composition of flue gas to check if combustion is at its most efficient.[3] In agriculture, they can be used to measure levels of carbon dioxide in greenhouses, where the levels are deliberately elevated.[6]

## References

1. ↑ Levy, Leonard A. (1922). Gasworks recorders, their construction and uses. London: Benn Brothers. pp. 174–178.
2. ↑ Levy, Leonard A. (1922). Gasworks recorders, their construction and uses. London: Benn Brothers. pp. 171–174.
3. ↑ 3.0 3.1 Uehling, E. A. (February 1912). "The Carbon Dioxide Recorder as a Factor in Fuel Economy.". Journal of Industrial & Engineering Chemistry 4 (2): 123–124. doi:10.1021/ie50038a012.
4. ↑ Bellman, Richard; Kalaba, Robert (8 November 2017) (in en). Classic Papers in Control Theory. Courier Dover Publications. p. 602. ISBN 978-0-486-82593-9. https://books.google.com/books?id=npk9DwAAQBAJ&pg=PA20.
5. ↑ Palmer, P. E.; Weaver, E. R. (7 January 1927). "Thermal-Conductivity Method for the Analysis Of Gases". Technologic Papers of the Bureau of Standards 18 (249): 36–99. https://nvlpubs.nist.gov/nistpubs/nbstechnologic/nbstechnologicpaperT249.pdf.
6. ↑ 6.0 6.1 Rosecrans, Crandall Z. (1 June 1927). "Automatic Gas Analysis Recorder for the Range of 0 to 35 per cent of CO_2 in Air". Journal of the Optical Society of America 14 (6): 479–490. doi:10.1364/JOSA.14.000479.

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