Communications: electrical – Continuously variable indicating – With meter reading
Patent
1990-12-17
1994-01-11
Don, Ulysses W.
Communications: electrical
Continuously variable indicating
With meter reading
340870160, H04Q 100
Patent
active
052785432
ABSTRACT:
A transmitter for use in a process control system has externally accessible actuators for permitting external adjustment of the zero and span (or full scale) settings of the transmitter. The transmitter has an explosion-proof housing which includes an interior chamber in which transmitter circuitry is located. Each of the actuators includes a movable magnet which operates a magnetic reed switch located within the interior chamber of the housing through a wall of the housing. Each of the magnets is mounted on a movable actuator which extends into a blind hole in a wall of the housing. By moving the magnet within its hole, the corresponding reed switch can be changed from a non-actuated to an actuated state. When the zero reed switch is actuated, the transmitter circuitry adjusts its output so that the present value of the parameter represents a process zero. When the span (or full scale) reed switch is actuated, the transmitter circuitry adjusts its output so that the present value of the sensed parameter represents a process maximum.
REFERENCES:
patent: 3046475 (1962-07-01), Binford
patent: 4101857 (1978-07-01), O'Toole
patent: 4122719 (1978-10-01), Carlson et al.
patent: 4126841 (1978-11-01), Maeno
patent: 4130745 (1978-12-01), Hetzer
patent: 4549180 (1985-10-01), Masuda
patent: 4739135 (1988-04-01), Custer
patent: 4748852 (1988-06-01), Frick
patent: 4794372 (1988-12-01), Kazahaya
Rosemount Inc., "Model 3051 Differential Pressure Transmitter", Mar., 1987.
Frick Roger L.
Lee David W.
Orth Kelly M.
Don Ulysses W.
Rosemount Inc.
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