Automatic device for controlling adjustable gains or losses associated with transmission circuits to compensate for transmission changes caused by temperature variations, the control usually depending upon the resistance of a conductor or pilot wire having substantially the same temperature conditions as the conductors of the circuits being regulated.


Related Terms

DEAD TIME

  1. The time interval between a change in the input signal to a process control system and the response to the signal.
  2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

POPPET VALVE

A cam-operated or spring-loaded reciprocating-engine mushroomtype valve used for control of admission and exhaust of working fluid; the direction of movement is at right angles to the plane of its seat.

POLE-POSITIONING

A design technique used in linear control theory in which many or all of a system's closed-loop poles are positioned as required, by proper choice of a linear state feedback law; if the system is controllable, all of the closed-loop poles can be arbitrarily positioned by this technique.

PNEUMATIC CONTROL VALVE

A valve in which the force of compressed air against a diaphragm is opposed by the force of a spring to control the area of the opening for a fluid stream.

PLANT DECOMPOSITION

The partitioning of a large-scale control system into subsystems along lines of weak interaction.

PIPE TAP

A small threaded hole or entry made into the wall of a pipe; used for sampling of pipe contents, or connection of control devices or pressure-drop-measurement devices.

PIPELINE

A line of pipe connected to valves and other control devices, for conducting fluids, gases, or finely divided solids.

PHOTOELECTRICLOOPCONTROL

[CONTSYS] Aphotoelectric control system used as a position regulator for a loop of material passing from one stripprocessing line to another that may travel at a different speed. Also known as loop control.

PHOTOELECTRIC LIQUID-LEVEL INDICATOR

A level indicator in which rising liquid interrupts the light beam of a photoelectric control system; used in a tank or process vessel.

PHOTOELECTRIC SORTER

A photoelectric control system used to sort objects according to color, size, shape, or other light-changing characteristics.

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