Frank Dennis Poag
Engineering at Russeff Fld Ln, Richmond, TX
License number
Louisiana PE.0034051
Issued Date
Aug 8, 2008
Expiration Date
Mar 31, 2017
Category
Civil Engineer
Type
Electrical and Computer Engineer
Address
Address
9410 Russeff Field Ln, Richmond, TX 77469
Professional information
Material Level Monitor
US Patent:
4720997, Jan 26, 1988
Filed:
Dec 1, 1986
Appl. No.:
6/936701
Inventors:
Roni K. Doak - Houston TX
Frank Poag - Rosenberg TX
Frank Poag - Rosenberg TX
International Classification:
G01F 2322
US Classification:
23295
Abstract:
The electronic monitor includes a level-sensing circuit, a reference circuit, a comparator circuit, and a logic circuit. The level sensing-circuit includes at least one level sensor positioned within the reservoir adjacent to and below a predetermined level. The reference circuit includes a reference sensor positioned in the air adjacent to the maximum allowed level for the material. A current source applies current to all the sensors. The comparator circuit compares the voltage across the reference sensor and the voltage across the level sensor and provides a difference voltage to a logic circuit that activates selective signaling devices depended upon the level of the monitored material. The sensors are preferably negative-coefficient thermistors.