Intrinsically safe mobile phone with gas alarm.

摘要

A cellular telephone is connected to a gas detector means (1, fig 1) which is either integrated within the telephone handset or contained in a separate housing 2 that has a plug 3 that may be connected directly to a socket 4 on the handset (fig 2). The separate detector housing 2 may also be indirectly connected via a charging lead so that a plug 7 of the lead is connected to the handset socket 4 and a secondary socket 6 of the lead accepts the plug 3 of the detector 2. The audible tones of the telephone handset may be used to alert a user of detected gas, and the handset controls may arm or disarm the alarm and may allow testing of the detector connection. Gas measurements may be displaced on the screen of the handset. The telephone handset and detector may be made intrinsically safe to prevent explosive gasses reaching contained circuitry or the handset and detector may be fitted into an intrinsically safe unit.