Watlow CAS200 Manual de usuario descargar pdf (Pagina 124)

Glossary CAS200 User’s Guide

112 Watlow Anafaze

TI (Timed Integral)

The Integral term.

Transmitter

A device that transmits temperature data from

either a thermocouple or RTD by way of a two-

wire loop. The loop has an external power sup-

ply. The transmitter acts as a variable resistor

with respect to its input signal. Transmitters

are desirable when long lead or extension

wires produce unacceptable signal degrada-

tion.

U

Upscale Break Protection

A form of break detection for burned-out ther-

mocouples. Signals the operator that the ther-

mocouple has burned out.

Undershoot

The amount by which a process variable falls

below the setpoint before it stabilizes.

V

Volt (V)

The unit of measure for electrical potential,

voltage or electromotive force (EMF).

See Voltage.

Voltage (V)

The difference in electrical potential between

two points in a circuit. It’s the push or pressure

behind current ﬂow through a circuit. One volt

(V) is the difference in potential required to

move one coulomb of charge between two

points in a circuit, consuming one joule of

energy. In other words, one volt (V) is equal to

one ampere of current (I) ﬂowing through one

ohm of resistance (R), or V=IR.

Z

Zero Cross

Action that provides output switching only at

or near the zero-voltage crossing points of the

ac sine wave.

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