§ 29.1 - Purpose.

The purpose of the regulations contained in this Part 29 is: (a) To establish procedures and prescribe requirements which must be met in filing applications for the approval of portable coal dust/rock dust analyzers for use in measuring the incombustible content of mine dusts, and the approval of continuous duty, warning light, portable methane detectors for use in providing a visual signal of the presence of a methane-air mixture having a methane concentration of 1.0 percent ±0.2 percent, or the approval of changes and modifications of approved portable coal dust/rock dust analyzers and continuous duty, warning light, portable methane detectors; (b) to specify minimum performance requirements and to prescribe methods to be employed in conducting inspections, examinations, and tests to determine the effectiveness of these instruments; and (c) to provide for the issuance of certificates of approval or modifications of certificates of approval for portable coal dust/rock dust analyzers and continuous duty, warning light, portable methane detectors which have met the minimum requirements for performance set forth in this part.