Watlow CAS200 - Manual (Page 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.