Two-wire transmitter with threshold detection circuit

Details Two-wire transmitter with threshold detection circuit Two-wire transmitter with threshold detection circuit

1987-10-09

1989-02-14

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

Combined

34087016, 34087038, 34087042, G08C 906, G08C 1902

Patent

active

048049581

ABSTRACT:
A threshold detection circuit for improving the output of a two-wire transmitter is disclosed. The transmitter comprises a sensing means which has a sensor responsive to a parameter to be sensed by the transmitter and an excitation means which provides an excitation output to excite the sensor. A threshold detection circuit is coupled to the sensor output and provides a detector output representative of an undesired change in excitation output which can produce a sensor output not substantially representative of the sensed parameter. An output means is coupled to the sensor output and detector output and provides the transmitter output as a function of the sensor output and detector output. A distinctive transmitter output representative of an undesired change in excitation output thus detected is provided, thereby improving the transmitter output.

REFERENCES:
patent: 4242665 (1980-12-01), Mate
patent: 4296413 (1981-10-01), Milkovic
patent: 4339750 (1982-07-01), Delacruz
patent: 4414853 (1983-11-01), Bryzek

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