Modifiers and Transmitters

Sensing Devices and Detectors

Indicators and Recorders

Engineering Symbology Prints and Drawings Volume 1 of 2
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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 Page 11

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