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  1. A value of temperature or pressure at which a control circuit closes. 2. An electrical device that allows current to flow through an electric circuit.


Related Terms

RELAY

A device that is operative by a variation in the conditions of one electric circuit to start the operation of other devices in the same or another electric circuit (such as pressure or temperature relay).

CAPILLARY TUBE

A tube of small internal diameter used as a liquid refrigerant flow control and pressure reducer between high and low pressure sides. Also used to transmit pressure from the sensitive bulb of some temperature controls to the operating element.

FIRING RATE CONTROL

A pressure temperature or flow controller which controls the firing rate of a burner according to the deviation from pressure or temperature set point. The system may be arranged to operate the burner on-off, high-low or in proportion to load demand.

BULB

The name given to the temperature-sensing device located in the fluid for which control or indication is provided. The bulb may be liquidfilled, gas filled, or gas-and-liquid filled. Changes in temperature produce pressure changes within the bulb which are transmitted to the controller.

GAUGE MANIFOLD

Chamber device constructed to hold both compound and high-pressure gauges. Valves control flow of fluids through.

ZERO GOVERNOR

A regulating device that is normally adjusted to deliver gas at atmospheric pressure within its flow rating.

PARACENTRIC

Pertaining to a key and keyway with longitudinal ribs and grooves that project beyond the center, as used in pin-tumbler to another in an electric network over multiple paths, in accordance with Kirchhoff's laws. 2. In particular, the flow of electric current through electric power systems over paths other than the contractual path.

COMPENSATION PYRHELIOMETER

A pyrheliometer consisting of two identical Manganin strips, one shaded, the other exposed to sunlight; an electrical current is passed through the shaded strip to raise its temperature to that of the exposed strip, and the electric power required to accomplish this is a measure of the solar radiation.

PILOT WIRE REGULATOR

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.

OHM'S LAW

The law that the direct current flowing in an electric circuit is directly proportional to the voltage applied to the circuit; it is valid for metallic circuits and many circuits component that obeys Ohm's law. OHV engine See overhead-valve engine.

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