Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-11-12
1993-06-08
Williams, Hezron E.
Communications: electrical
Condition responsive indicating system
Specific condition
73 3106, G08B 1710
Patent
active
052183475
ABSTRACT:
A new and improved gas detection, concentration and warning apparatus is disclosed which includes a tin dioxide semiconductor gas sensor operated with a load resistor of a preselected value and power source for producing reliable and consistent gas concentration voltage output for either a voltmeter having a dial calibrated to read the voltage and indicate corresponding gas concentrations for a portable work site apparatus or to trigger and threshold inputs to a 555 timer where first and second state outputs are connected to either a sound alarm for a home apparatus or to light or sound or both alarms located in a vehicle dashboard for a natural gas fueled vehicle. For vehicle use, multiple gas sensor circuits are used with their probes located under the vehicle hood and in the supply tank compartment (trunk).
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Lindale Industries, Inc.
Williams Hezron E.
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