[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: 30CFR27.22]

[Page 144]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 27--METHANE-MONITORING SYSTEMS--Table of Contents
 
             Subpart B--Construction and Design Requirements
 
Sec. 27.22  Methane detector component.

    (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.
    (b) A methane detector shall include:
    (1) A method of continuous sampling of the atmosphere in which it 
functions.
    (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.
    (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.
    (4) A suitable filter on the sampling intake to prevent dust and 
moisture from entering and interfering with normal operation.
    Note: This requirement for the methane detector may be waived if the 
design is such as to preclude the need of a filter.
    (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.