---
kind: "section"
citation: "42 C.F.R. § 84.83"
title: "42"
number: "84.83"
heading: "Timers; elapsed time indicators; remaining service life indicators; minimum requirements."
url: "https://uscodex.org/cfr/42/84.83"
---

# §84.83. Timers; elapsed time indicators; remaining service life indicators; minimum requirements.

- (a) Elapsed time indicators shall be provided for apparatus with a chemical oxygen source, except:
  - (1) Apparatus used for escape only; or
  - (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.
- (c) Timers shall be readable by sight and by touch during use by the wearer.
- (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.
- (f) Each remaining service-life indicator or warning device must give an alarm when the remaining service life is reduced to a minimum of 25 percent of its rated service time or any higher minimum percent value or values as specified in the approval. Open-circuit demand and pressure-demand respirators must alarm continuously until depletion of the breathing air supply. The percent value set for indicator activation must be identified by labels and/or markings on each respirator unit.

## Notes

### Amendments

[60 FR 30355, June 8, 1995, as amended at 78 FR 2622, Jan. 14, 2013]

### Authority

Authority: 29 U.S.C. 651 et seq.; 30 U.S.C. 3, 5, 7, 811, 842(h), 844.

### Source

Source: 60 FR 30355, June 8, 1995, unless otherwise noted.

### Amendments

[60 FR 30355, June 8, 1995, as amended at 78 FR 2622, Jan. 14, 2013]