Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-12-18
1989-10-17
Levy, Stewart J.
Communications: electrical
Condition responsive indicating system
Specific condition
73 23, G01B 2100
Patent
active
048750310
ABSTRACT:
A hazardous gases detector that is completely self contained and small enough to fit into small diameter pipe bores. The system is housed in two sealed enclosures, one housing the detection circuits and batteries and the other the signal output. The two components are connected by a length of electrical cable. The invention detects BTX vapors in monitor well bores or piping connected to the detection volume of dual walled underground fuel storage tanks. The signal output end of the invention caps the well or conduit and suspends the sensor end in the well bore or conduit. The detection circuit and battery end is suspended ten feet or more below the gound level and thusly ensures uniform temperature, and thus stable performance of the detector. Circuits that time vapors sampling interval provide long term operation from a battery comprised of six standard "D" size cells, leak detection is signaled by blinding lights and horn, with two weeks of signal capacity in the battery, a minimum. Internal non-reversible indication of leak detection is also provided. The lower housing is intrinsic safe by pressure containment and the upper housing by current limitation. The system can be varied to function from a solar cell battery combination and transmit signals by radio. Installation does not require electrical or signal wiring, thus is not susceptable to technician error for installation and service.
REFERENCES:
patent: 3924442 (1975-12-01), Kerho et al.
patent: 4166380 (1979-09-01), Batz
patent: 4644333 (1987-02-01), Barendsz et al.
patent: 4646069 (1987-02-01), Andrejasich et al.
patent: 4665385 (1987-05-01), Henderson
patent: 4736193 (1988-04-01), Slocum et al.
Filippi Ernest A.
Miller Kenneth L.
Levy Stewart J.
Roskos Joseph W.
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