Self-actuated final control element symbol Moisture trap with equalizing line. Fusible plug or disk. Thermal safety element. Note required for other trap types. Steam trap. Generic moisture trap. Filled thermal system. Temperature regulator. Vacuum relief. …
Measurement symbols – secondary instruments Pressure Temperature Thermometer. Pressure gage. Multiple gages may be shown as one bubble or one bubble for each section. Gage glass externally mounted on vessel or standpipe. Sight glass. …
Measurement symbols – primary elements Bubble may be omitted if connected to another instrument. Strain gage or other electronic type sensor. May be through top of vessel. Insert probe. Guide wires may be omitted. Location …
Measurement symbols – measurement notations Weight, Force TRAN = Transistor SG = Strain gage P-V = Pressure-vacuum MAN = Manometer US = Ultrasonic TTS = Transit time sonic TAR = Target SON = Sonic PV …
Measurement symbols – auxiliary and accessory devices Bubble May Be Omitted If Connected To Another Instrument. Test Well, Flanged. Thermowell, Flanged. Diaphragm Chemical Seal, Welded. Diaphragm Pressure Seal, Welded. Diaphragm Chemical Seal, Flanged, Threaded, Socket …
Measurement symbols – primary elements and transmitters Insert Element In Or On Process Flow Line, Vessel, Or Equipment. Connecting Line Shall Be Equal To Or Greater Than 0.5 Inches (12 Millimeters). Transmitter With Remote Primary …
Line symbols – instrument-to-instrument connections (##) = Drawing Or Sheet Number Receiving Or Sending Signal. (#) = Instrument Tag Number Sending Or Receiving Signal. Drawing-to-drawing Signal Connector, Signal Flow From Left To Right. (*) = …
Line symbols – instrument to process and equipment connections Welded Instrument Connection To Equipment. Welded Instrument Connection To Process Line. Socket Welded Instrument Connection To Equipment. Socket Welded Instrument Connection To Process Line. Threaded Instrument …
Instrumentation device or function symbols, miscellaneous Undefined Interlock Logic Function. Generic Interlock Logic Function. C-12 Equals Patchboard Column And Row Respectively, As An Example. Console Matrix Point. Panel-mounted Patchboard Plug-in Point. Interlock Logic Function. …