Measuring and testing – Gas analysis – With compensation detail
Patent
1994-09-30
1996-03-05
Williams, Hezron E.
Measuring and testing
Gas analysis
With compensation detail
73 2501, 73 232, G01N 2716, G01N 2700, G08B 1710
Patent
active
054957478
ABSTRACT:
A gas detection device is provided comprising an exterior housing in which an active pelement and a compensating pelement are disposed. The gas detection device further comprises a porous frit seated within a distal end of the exterior housing to separate the active pelement and the compensating pelement from the surrounding environment. The porous frit is adapted to prevent flashback into the surrounding environment while allowing movement of environmental gas through the porous frit to contact the active pelement and the compensating pelement. The gas detection device further comprises a flow guide for directing flow of environmental gas into the gas detection device disposed adjacent the exterior side of the porous frit. The flow guide comprises an inlet port through which a forced flow of environmental gas is pumped to pass through the porous frit and into the exterior housing in a direction generally parallel to the axis of the exterior housing. The flow guide also comprises an outlet port through which gas may exit the exterior housing. A gas detection device is also provided in which the electrical resistance of the compensating pelement is measured to determine concentration of combustible gas at combustible gas concentration levels above a predetermined concentration level set equal to the LEL (Lower Explosive Limit). The gas detection comprises a circuit for reducing current passing through the active pelement when the gas detection device is being used above the predetermined concentration level.
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Bruce Daniel E.
Herman Roberta A.
Long Stephen E.
Schneider Alan A.
Bartony, Jr. Henry E.
Mine Safety Appliances Company
Uber James G.
Wiggins J. David
Williams Hezron E.
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