Electric and pneumatic feedback controlled positioner

Details Electric and pneumatic feedback controlled positioner Electric and pneumatic feedback controlled positioner

1987-10-23

1989-04-11

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91465, F15B 903

Patent

active

048195430

ABSTRACT:
A control force input system for a balance beam or pivot arm pneumatic positioner which does not allow the controlled apparatus to make a full travel motion when the overall control signal is removed. The control force is transmitted to the balance beam by the coupling of the magnetic fields produced by a fixed magnet located on the balance beam and a variable magnet located away from the balance beam. When the motive control signal is removed from the variable magnet, the balance beam returns to an equilibrium or zero position due to the action of a pair of zero springs, stopping the controlled apparatus at its position when the control signal is removed.

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patent: 4513782 (1985-04-01), Contartese et al.
patent: 4712470 (1987-12-01), Schmitz
Eckardt Pneumatic Positioner SRP 981 brochure, p. 1-22, Jan. 1984.
Conameter Corp., Series 42 Actaire pneumatic positioner data sheet, 12/84.

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