Transducer utilizing electrical and pneumatic signals

Details Transducer utilizing electrical and pneumatic signals Transducer utilizing electrical and pneumatic signals

1983-03-28

1985-08-06

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

Plural series units

137 85, 25112915, G05D 1600

Patent

active

045329516

ABSTRACT:
An electrical-pneumatic transducer includes a pneumatic relay in which the pressure of the air at the outlet varies in accordance with the back pressure of the air at a bleed nozzle in the relay. This back pressure is changed by the armature of a solenoid with the armature opposing the nozzle outlet and being urged toward the latter with a force responsive to a signal in the form of current flowing through the solenoid coil. The magnitude of the current is correlated with the magnitude of a variable condition. The force on the armature, which is a permanent magnet, is selectively set to calibrate the transducer by means of a second permanent magnet which is axially aligned with the armature and is adjustably movable toward and away from the latter.

REFERENCES:
patent: 2983278 (1961-05-01), Heintz
patent: 3244190 (1966-04-01), Taylor
patent: 3393694 (1968-07-01), Baker
patent: 3446472 (1969-05-01), Freeman
patent: 4306589 (1981-12-01), Harned
patent: 4325399 (1982-04-01), Frick

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