DOE-HDBK-1016/1-93
Engineering Fluid Diagrams and Prints
ENGINEERING FLUIDS DIAGRAMS AND PRINTS
Modifiers and Transmitters
Sensors and detectors by themselves are not sufficient to create usable system indications. Each
sensor or detector must be coupled with appropriate modifiers and/or transmitters. The
exceptions are certain types of local instrumentation having mechanical readouts, such as bourdon
tube pressure gages and bimetallic thermometers. Figure 10 illustrates various examples of
modifiers and transmitters. Figure 10 also illustrates the common notations used to indicate the
location of an instrument, i.e., local or board mounted.
Transmitters are used to
Figure 10 Transmitters and Instruments
convert the signal from a
sensor or detector to a
form that can be sent to a
r e m o t e
p o i n t
f o r
processing, controlling, or
monitoring.
The output
can be electronic (voltage
or current), pneumatic, or
hydraulic.
Figure 10
illustrates
symbols
for
several specific types of
transmitters.
The reader should note that
modifiers may only be
identified by the type of
input and output signal
(such as I/P for one that
converts an electrical input
to a pneumatic output)
rather
than
by
the
monitored parameter (such
as
PM
for
pressure
modifier).
Rev. 0
PR-02
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