Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1985-10-25
1988-02-02
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With particular transmitter
73304C, 324 61P, 340870040, G01F 2326
Patent
active
047231220
ABSTRACT:
A two-wire, admittance-responsive instrument system in which a transmitter, receiver and calibrator are connected by a two-wire transmission line is disclosed. The calibrator repetitively transmits a calibration enabling signal causing the transmitter to increment a reference admittance for comparison to a sensed admittance corresponding to a known physical condition. The calibrator monitors the bistable output signals transmitted by the transmitter in the calibration mode, which changes state when the incremented reference admittance bears a predetermined relationship to the sensed admittance. The calibrator may then transmit additional calibration enabling signals causing preload to be established for transmitter operation.
REFERENCES:
patent: 4146834 (1979-03-01), Maltby et al.
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patent: 4363030 (1982-12-01), Maltby et al.
patent: 4451826 (1984-05-01), Fasching
patent: 4499766 (1985-02-01), Fathauer et al.
patent: 4573040 (1986-02-01), Maltby
patent: 4589077 (1986-05-01), Pope
patent: 4590575 (1986-05-01), Emplit
Hall Richard G.
Hoopes Howard S.
Kramer Jonathan L.
Maltby Frederick
Petersen Steven R.
Drexelbrook Controls, Inc.
Yusko Donald J.
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