| 摘要 |
<p>The invention provides, in one aspect, a head up display unit (24) for a re-circulating gas self-contained breathing apparatus (10) of the type having at least one sensor for determining the oxygen partial pressure of the re-circulating gas. At least one optical fibre (32) is provided for transmitting a light signal or signals from a respective light emitter, positioned outside the wearer's field of view and electrically connected to the at least one sensor, to a display (26) in the wearer's field of view to provide the wearer with a visual indication of the light emitter signal or signals.</p> |
