Methanometer

Methanometer

A methanometer is an instrument used to measure methane gas in the air of a mine. The Mine Safety Appliances Company Ltd. manufactured the first type - W8 Methanometer around 1950.and it was approved for use by the Ventilation Regulations of 1947. The Methanometer could be powered by an Edison battery cap lamp and it could be carried on a miner's belt with other tools. Methane is the main gas present in firedamp. It is highly explosive and had previously been detected by the blue halo effect it gave to the flame of a safety lamp.

By 1883, several instruments for measuring methane concentration in air had been developed. [1] These relied on such methods as the differential heating of an incandescent platinum filament, or by measuring the higher absorption of infrared radiation by gas containing methane.

A catalytic-type methanometer uses an array of four heated wire filament elements, two active filaments are coated with a catalyst, arranged in a Wheatstone bridge with two inactive elements that have no coating. When exposed to methane-contaminated air, the coated filaments heat up due to oxidation of the methane, and the resulting imbalance in the resistance of active and inactive elements can be displayed on a calibrated meter. Such instruments require oxygen to work and can be inaccurate if methane concentration is very high. The catalyst can be poisoned by exposure to some chemicals, again making the instrument insensitive to methane. [2]

See also

References

  1. ^ Édouard Hospitalier, (Translated by Julius Maier) The Modern Applications of Electricity: Telephone; various applications; electrical transmission of energy, 2nd edition, D. Appleton and company, 1883 chapter part II chapter 1 Methanometers pages 197-208
  2. ^ Paul McKenzie-Wood Detection of Gases in Jeanne Mager Stellman (ed) Encyclopaedia of Occupational Health and Safety: Chemical, industries and occupations Volume 3 of Encyclopaedia of Occupational Health and Safety, International Labour Office, 1998 ISBN 9221092038, pages 74.41 - 74.42

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Look at other dictionaries:

  • Methanometer — Meth a*nom e*ter, n. [Methane + meter.] An instrument, resembling a eudiometer, to detect the presence and amount of methane, as in coal mines. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • Methanometer — Grubengasmesser (m), Grubengasüberwachungsgerät (n), Methanometer (m) eng firedamp detector, methane detector, methane monitor, methanometer …   Arbeitssicherheit und Gesundheitsschutz Glossar

  • methanometer — instrument for detecting presence of methane Scientific Instruments …   Phrontistery dictionary

  • methanometer — methanomˈeter noun (mining) An instrument for detecting the presence of methane in mines • • • Main Entry: ↑methane …   Useful english dictionary

  • Grubengasmesser — (m), Grubengasüberwachungsgerät (n), Methanometer (m) eng firedamp detector, methane detector, methane monitor, methanometer …   Arbeitssicherheit und Gesundheitsschutz Glossar

  • Grubengasüberwachungsgerät — Grubengasmesser (m), Grubengasüberwachungsgerät (n), Methanometer (m) eng firedamp detector, methane detector, methane monitor, methanometer …   Arbeitssicherheit und Gesundheitsschutz Glossar

  • метанометр — rus метанометр (м), сигнализатор (м) метана eng firedamp detector, methane detector, methane monitor, methanometer fra grisoumètre (m), détecteur (m) de grisou, méthanomètre (m) deu Grubengasmesser (m), Grubengasüberwachungsgerät (n),… …   Безопасность и гигиена труда. Перевод на английский, французский, немецкий, испанский языки

  • сигнализатор метана — rus метанометр (м), сигнализатор (м) метана eng firedamp detector, methane detector, methane monitor, methanometer fra grisoumètre (m), détecteur (m) de grisou, méthanomètre (m) deu Grubengasmesser (m), Grubengasüberwachungsgerät (n),… …   Безопасность и гигиена труда. Перевод на английский, французский, немецкий, испанский языки

  • Davy lamp — (drawing) Davy lamp (photo) …   Wikipedia

  • Taschen-Grubengasmesser — (m) eng miniature methanometer …   Arbeitssicherheit und Gesundheitsschutz Glossar

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