42 CFR 84.83 - Timers; elapsed time indicators; remaining service life indicators; minimum requirements.
(2) Liquefied breathing gas apparatus equipped with gages visible to the wearer which indicate the remaining liquid content in the container.
(b) The timer or other indicator shall be accurately calibrated in minutes of remaining service life.
(d) Timers shall be equipped with automatically preset alarms which will warn the wearer for a period of 7 seconds or more after the preset time has elapsed.
(e) Remaining service-life indicators or warning devices shall be provided in addition to a pressure gage on compressed gas self-contained breathing apparatus, except apparatus used for escape only, and shall operate automatically without preadjustment by the wearer.
Title 42 published on 2014-10-01
no entries appear in the Federal Register after this date.