CEMP-E
TI 810-11
30 November 1998
Signal Inverter:
A device that linearly converts a 4 to 20
milliampere input signal to an output signal of
20 to 4 milliamperes.
Signal Selector:
A device that selects the highest or the
lowest of its input signals as its output signal.
SLDC
Single Loop Digital Controller - A controller
that accepts analog input signals, processes
the signals digitally according to the
controller configuration, and, as a result,
produces analog output and two-position
output signals.
SMK:
Smoke Detector
Smoke Detector:
A generic term for devices that are used to
operate safety circuits on the detection of
smoke or products of combustion.
SP:
Static Pressure
S.P.:
Setpoint
Span:
The number of engineering units between
the extremes of a calibration range.
SPRG:
Spring Range
Spring Range:
The range over which the input signal to a
controlled device must change to move the
device from one extreme to the other.
SPT:
Static-Pressure Transmitter
SQCR:
Sequencer
STM:
Steam
SUN:
Sunday
Sunshield:
A device installed outdoors on the surface of
a building to house outside-air
temperature-sensing elements and to shield
them from direct exposure to sun's radiation.
Supply Pressure:
Gauge pressure of the compressed air
supplied to a pneumatic control system,
usually 140 kPa (20 psig).
Supply Voltage:
Voltage of the electric energy supply to an
electric/electronic control system.
Glossary-12
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