GB1384320A - Apparatus for automatic monitoring of presence fo the methane in air - Google Patents

Apparatus for automatic monitoring of presence fo the methane in air

Info

Publication number
GB1384320A
GB1384320A GB1752572A GB1752572A GB1384320A GB 1384320 A GB1384320 A GB 1384320A GB 1752572 A GB1752572 A GB 1752572A GB 1752572 A GB1752572 A GB 1752572A GB 1384320 A GB1384320 A GB 1384320A
Authority
GB
United Kingdom
Prior art keywords
air
methane
monitoring
actuates
photo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1752572A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
POLSKIE ZAKLADY OPTYCZNE
Original Assignee
POLSKIE ZAKLADY OPTYCZNE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by POLSKIE ZAKLADY OPTYCZNE filed Critical POLSKIE ZAKLADY OPTYCZNE
Publication of GB1384320A publication Critical patent/GB1384320A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods

Abstract

1384320 Monitoring methane in air photoelectrically POLSKIE ZAKLADY OPTYCZNE 17 April 1972 [3 May 1971] 17525/72 Heading G1A In an apparatus for monitoring the presence of methane in an air sample flowing through a measuring chamber 8 of an interferometric device a movable slot 13 defines the portion of the interference pattern viewed by a photo-cell 14 whose output actuates a warning device when a pre-set CH 4 level is exceeded. To calibrate the device the measuring chamber 8 and reference chambers 5, 11 are filled with the same gas, and the slot 13 is moved to give a minimum photo-cell output. The air under test is then flowed through the chamber 8 and the presence of CH 4 actuates an audible alarm 20 and/or a flashing light 21.
GB1752572A 1971-05-03 1972-04-17 Apparatus for automatic monitoring of presence fo the methane in air Expired GB1384320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL14791771A PL70816B1 (en) 1971-05-03 1971-05-03

Publications (1)

Publication Number Publication Date
GB1384320A true GB1384320A (en) 1975-02-19

Family

ID=19954251

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1752572A Expired GB1384320A (en) 1971-05-03 1972-04-17 Apparatus for automatic monitoring of presence fo the methane in air

Country Status (5)

Country Link
DD (1) DD97303A5 (en)
DE (1) DE2216395A1 (en)
FR (1) FR2135161B1 (en)
GB (1) GB1384320A (en)
PL (1) PL70816B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497373A (en) * 1981-08-20 1985-02-05 Graviner Limited Fire and explosion detection and suppression
CN102998286A (en) * 2012-12-20 2013-03-27 重庆一心仪器仪表有限公司 Method for detecting concentration of methane by means of light interference

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497373A (en) * 1981-08-20 1985-02-05 Graviner Limited Fire and explosion detection and suppression
CN102998286A (en) * 2012-12-20 2013-03-27 重庆一心仪器仪表有限公司 Method for detecting concentration of methane by means of light interference
CN102998286B (en) * 2012-12-20 2014-10-15 重庆一心仪器仪表有限公司 Method for detecting concentration of methane by means of light interference

Also Published As

Publication number Publication date
DD97303A5 (en) 1973-04-20
FR2135161A1 (en) 1972-12-15
DE2216395A1 (en) 1973-03-15
PL70816B1 (en) 1974-04-30
FR2135161B1 (en) 1974-07-26

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees