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Trend Electrical Relay Diagram And P ID Symbols From Industrial Instrument Symbol P Amp Id instrument symbol p amp id P ID Symbols www industrialtext com 1 800 752 8398 P ID SYMBOLS INSTRUMENT LINE SYMBOLS SYMBOLS FOR TRANSDUCERS AND ELEMENTS Orifice plate Control valve Magnetic Rotameter Venturi or nozzle FE 10 FE 104 EE 4 FI 5 Capillary tube Electric signal EM sonic radioactive Hydraulic Pneumatic Process FV 101 instrument symbol p amp id CT1 Current Transformers Ratio Polarity Types Draw Out Instrument Cases Meters and protective relays are available in draw out cases that auto matically short circuit the CT when the instrument is removed for test ing and calibration Voltage and trip circuit contacts will be opened See symbol for draw out case on Sheet 2 Shorting screw in any other locations shorts CT Safety Ground New Japan Radio Co Ltd NJM2121 6 Ver 2020 03 16 Switching Mechanism of NJM2121 is as follows Switch signal is communicated in case that V F of Q26 goes ON on current mirror which is composed with Q26 and Q27 Q10 goes ON by 4diodes of Q10 in case that terminal 1 goes OFF and Amp ch A goes active Q9 goes ON by 6 diodes of Q9 in Instrumentation Symbols and Identification The ISA Standards Committee on Instrumentation Symbols and Identification operates within the ISA Standards and Practices Department with William Calder III as vice president The persons listed below served as members of or advisors to the SP5 1 committee The SP5 1 committee is Typical Electrical Drawing Symbols and Conventions ANSI IEEE Standard Device Numbers 1 Master Element 2 Time Delay Starting or Closing Relay 3 Checking or Interlocking Relay 4 Master Contactor

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