Multiplexed arrangement for connecting a plurality of transducer

Details Multiplexed arrangement for connecting a plurality of transducer Multiplexed arrangement for connecting a plurality of transducer

1982-09-22

1985-01-29

Wise, Edward J.

Boots, shoes, and leggings

364200, 364900, 364509, 73304C, 340620, G01F 2326, G06F 1500

Patent

active

044970331

ABSTRACT:
A multiplexed circuit for selecting one of a plurality of vertically spaced resistance temperature devices (RTDs) in a fluid storage tank. An electronic multiplexer is used to select a particular one of a plurality of vertically spaced RTDs to be connected to circuitry for reading the output value of same. The device is used in connection with an intelligent field interface device (FID) at the tank. The FID contains a table storing values for expected ranges of output values from the RTDs. When a value actually read is out of range, the FID causes the multiplexer to select another RTD for reading. The arrangement also allows reading of temperatures at various levels within the tank, irrespective of the actual fluid level.

REFERENCES:
patent: Re31089 (1982-11-01), Adamson
patent: 3964037 (1976-06-01), Lamphere
patent: 4203090 (1980-05-01), Adamson
patent: 4258422 (1981-03-01), Dougherty et al.
patent: 4275382 (1981-06-01), Jannotta
patent: 4337638 (1982-07-01), Leonard et al.
patent: 4349882 (1982-09-01), Asmundsson et al.
patent: 4382382 (1983-05-01), Wang

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