[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR75.320]

[Page 472-473]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 75--MANDATORY SAFETY STANDARDS--UNDERGROUND COAL MINES--Table of Contents
 
                         Subpart D--Ventilation
 
Sec. 75.320  Air quality detectors and measurement devices.

    (a) Tests for methane shall be made by a qualified person with MSHA 
approved detectors that are maintained in permissible and proper 
operating condition and calibrated with a known methane-air mixture at 
least once every 31 days.
    (b) Tests for oxygen deficiency shall be made by a qualified person 
with MSHA approved oxygen detectors that are maintained in permissible 
and proper operating condition and that can detect 19.5 percent oxygen 
with an accuracy of 0.5 percent. The oxygen detectors shall 
be calibrated at the start of each shift that the detectors will be 
used.
    (c) Handheld devices that contain electrical components and that are 
used for measuring air velocity, carbon monoxide, oxides of nitrogen, 
and other gases shall be approved and maintained in permissible and 
proper operating condition.
    (d) An oxygen detector approved by MSHA shall be used to make tests 
for oxygen deficiency required by the regulations in this part. 
Permissible flame safety lamps may only be used as a supplementary 
testing device.
    (e) Maintenance of instruments required by paragraphs (a) through 
(d) of

[[Page 473]]

this section shall be done by persons trained in such maintenance.