{"data":{"id":"us/30-cfr-27.22","jurisdiction":"us","citation":"30 CFR 27.22","heading":"Methane detector component.","body":"(a) A methane detector component shall be suitably constructed for incorporation in or with permissible and approved equipment that is operated in gassy mines and tunnels.\n(b) A methane detector shall include:\n(1) A method of continuous sampling of the atmosphere in which it functions.\n(2) A method for actuating a warning device which shall function automatically at a methane content of the mine atmosphere between 1.0 to 1.5 volume percent. The warning device shall also function automatically at all higher concentrations of methane in the mine atmosphere.\n(3) A method for actuating a power-shutoff component, which shall function automatically when the methane content of the mine atmosphere is 2.0 volume percent and at all higher concentrations of methane.\n(4) A suitable filter on the sampling intake to prevent dust and moisture from entering and interfering with normal operation.\nNote:\nThis requirement for the methane detector may be waived if the design is such as to preclude the need of a filter.\n(c) A methane detector may provide means for sampling at more than one point; provided, the methane detector shall separately detect the methane in the atmosphere at each sampling point with, in MSHA's opinion, sufficient frequency.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS","PART 27—METHANE-MONITORING SYSTEMS","Subpart B—Construction and Design Requirements"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"1a6b522d7065a95e2bb30289ae8b6db6245bf325cf5e83f8ea0de2faf0dc1469","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-27.21","next":"us/30-cfr-27.23"},"notice":"GroundRules: Original legal text. Not legal advice."}