30 CFR § 22.2 - Definitions.
---
identifier: "/us/cfr/t30/s22.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 22.2 - Definitions."
title_number: 30
title_name: "Mineral Resources"
section_number: "22.2"
section_name: "Definitions."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "B"
subchapter_name: "TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS"
part_number: "22"
part_name: "PORTABLE METHANE DETECTORS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 957, 961."
regulatory_source: "Schedule 8C, Oct. 31, 1935, unless otherwise noted."
cfr_part: "22"
---
# 22.2 Definitions.
(a) *Methane detector.* A methane detector is a device that may be used to detect the presence of methane in a gassy mine.
(b) *Methane-indicating detector.* A methane-indicating detector is a device that will show, within certain limits of error, on an adequate scale, the percentage of methane in a gassy atmosphere.
(c) *Permissible.* Completely assembled and conforming in every respect with the design formally approved by MSHA under this part. (Approvals under this part are given only to equipment for use in gassy and dusty mines.)
[Sched. 8C, Oct. 31, 1955, as amended by Supp. 1, 20 FR 2575, Apr. 19, 1955]