DOE-HDBK-1016/1-93 Engineering Fluid Diagrams and Prints ENGINEERING FLUIDS DIAGRAMS AND PRINTS TABLE  1 Instrument Identifiers Sensed Parameter Type of Indicator or Controller Type of Component Type of signal F   = flow T  = temperature P   = pressure I   = current L  = level V  = voltage Z  = position R  = recorder I   = indicator C  = controller T    = transmitter M   = modifier E    = element I = current V   = voltage P = pneumatic The first three columns above are combined such that the resulting instrument identifier indicates its  sensed  parameter,  the  function  of  the  instrument,  and  the  type  of  instrument.    The  fourth column is used only in the case of an instrument modifier and is used to indicate the types of signals being modified.  The following is a list of example instrument identifiers constructed from Table 1. FIC   = flow indicating controller FM   = flow modifier PM   = pressure modifier TE    = temperature element TR    = temperature recorder LIC   = level indicating controller TT = temperature transmitter PT = pressure transmitter FE = flow element FI = flow indicator TI = temperature indicator FC = flow controller Rev. 0 PR-02 Page 9