[Code of Federal Regulations]
[Title 42, Volume 1]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 42CFR84.82]

[Page 522]
 
                         TITLE 42--PUBLIC HEALTH
 
    CHAPTER I--PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN 
                                SERVICES
 
PART 84_APPROVAL OF RESPIRATORY PROTECTIVE DEVICES--Table of Contents
 
              Subpart H_Self-Contained Breathing Apparatus
 
Sec. 84.82  Gas pressure gages; minimum requirements.

    (a) Gas pressure gages employed on compressed breathing gas 
containers shall be calibrated in pounds per square inch.
    (b) Liquid-level gages shall be calibrated in fractions of total 
container capacity, or in units of liquid volume.
    (c) Gas pressure gages other than those specified in paragraphs (a) 
and (b) of this section shall be calibrated in:
    (1) Pounds per square inch; or
    (2) In fractions of total container capacity; or
    (3) Both in pounds per square inch and fractions of total container 
capacity.
    (d)(1) Dial-indicating gages shall be reliable to within 5 percent of full scale when tested both up and down the 
scale at each of 5 equal intervals.
    (2) The full-scale graduation of dial-indicating gages shall not 
exceed 150 percent of the maximum rated cylinder pressures specified for 
the container in applicable Department of Transportation specifications 
or permits.
    (e)(1) Stem-type gages shall be readable by sight and by touch and 
shall have a stem travel distance of not less than one-fourth inch 
between each graduation.
    (2) A minimum of five graduations shall be engraved on the stem of 
each gage and these graduations shall include readings for empty, one-
quarter, one-half, three-quarters, and full.
    (3) Stem gage readings shall not vary from true readings by more 
than one-sixteenth inch per inch of stem travel.
    (f) The loss of gas through a broken gage or severed gage connection 
shall not exceed 70 liters per minute when the cylinder pressure is 
6,900 kN/m.2 (1,000 pounds per square inch gage) or when the 
liquid level is at one-half.
    (g) Where gages are connected to the apparatus through a gage line, 
the gage and line shall be capable of being isolated from the apparatus 
except where the failure of the gage or line would not impair the 
performance or service life of the apparatus.
    (h) Oxygen pressure gages shall have the words ``Oxygen'' and ``Use 
No Oil'' marked prominently on the gage.
    (i)(1) Apparatus using compressed breathing gas, except apparatus 
classified for escape only, shall be equipped with gages visible to the 
wearer which indicate the remaining gas content in the container.
    (2) Apparatus using liquefied breathing gas, except apparatus 
classified for escape only, shall be equipped with gages visible to the 
wearer which indicate the remaining liquid content in the container; 
however, where the liquid content cannot be rapidly vented, and the 
service time of the device begins immediately after filling, a timer 
shall be provided in place of a visible gage.