Patent ID: RE40238

Claim:
A personal alarm system for responding to hydrogen sulfide gas at a well site that is at a remote location relative to a host computer, comprising: a person-carried alarm instrument providing a trigger signal in response to a concentration of hydrogen sulfide gas reaching a predetermined limit; a fault monitoring system set up at a generally fixed location at the well site remote location , wherein the person-carried alarm instrument is movable relative to the fault monitoring system; a first wireless communication link having a limited distance range between the person-carried alarm instrument and the fault monitoring system, wherein the first wireless communication link conveys the trigger signal from the person-carried alarm instrument to the fault monitoring system; an alarm status signal created by the fault monitoring system in response to receiving the trigger signal from the person-carried alarm instrument; and a second wireless communication link having a greater distance range between the fault monitoring system and the host computer, wherein the greater distance range is greater than the limited distance range, and wherein the second wireless communication link conveys the alarm status signal from the fault monitoring system to the host computer, whereby the host computer is notified that the concentration of hydrogen sulfide gas reached the predetermined limit at the well site remote location .