Patent ID: 8717161

Claim:
An H2S system for protecting a worker at a worksite by responding to an H2S alarm event at the worksite, the H2S alarm event being a concentration of H2S gas exceeding a predetermined safe limit, the H2S system comprising: a holder; a local monitor responsive to the H2S alarm event, the local monitor having selectively an on state and a lockout state, the local monitor being automatically switched from the on state to the lockout state in response to being connected to the holder, the on state and the lockout state are as follows: in the on state, the local monitor sounds a local audible alarm in response to the H2S alarm event; in the on state, the local monitor emits an alarm signal over a local wireless communication link in response to the H2S alarm event; in the lockout state, the local monitor sounds the local audible alarm in response to the H2S alarm event; and in the lockout state, the local monitor is inhibited from emitting the alarm signal over the local wireless communication link in response to the H2S alarm event.