Indicating Totalizer Solonoid valve Control Valve Calculation Ratio Calculation Switch Low Switch High Alarm Low Alarm Low-Low Alarm High Alarm High-High Ratio Controller Controller Indicator Controller Indicator Transmitter T I IC C FC AT AI AIC AC AFC CT CI CIC CC CFC DT DI DIC DC DFC ET EI EIC EC EFC FT FI FIC FC FFC GT GI GIC GC GFC HT HI HIC HC HFC IT II IIC IC IFC KT KI KIC KC KFC LT LI LIC LC LFC MT MI MIC MC MFC NT NI NIC NC NFC PT PI PIC PC PFC dPT dPI dPIC dPC dPFC QT QI QIC QC QFC RT RI RIC RC RFC ST SI SIC SC SFC TT TI TIC TC TFC dTT dTI dTIC dTC dTFC VT VI VIC VC VFC WT WI WIC WC WFC YT YI YIC YC YFC ZT ZI ZIC ZC ZFC Totalizer E AE CE DE EE FE GE HE IE KE LE ME NE PE dPE QE RE SE TE dTE VE WE YE ZE Hand Valve A C D E F G H I K L M N P dP Q R S T dT V W Y Z Hand switch Code Recorder Analysis Conductivity Density Voltage Flow Dimension Hand Current Time Level Humidity Power Pressure Delta Pressure Quantity Radioactivity Speed Temperature Delta Temperature Viscosity Weight Vibration Position Element Process Measurement Element Type ISA Symbols R AR CR DR ER FR GR HR IR KR LR MR NR PR dPR QR RR SR TR dTR VR WR YR ZR HS AHS CHS DHS EHS FHS GHS HHS IHS KHS LHS MHS NHS PHS dPHS QHS RHS SHS THS dTHS VHS WHS YHS ZHS HV AHV CHV DHV EHV FHV GHV HHV IHV KHV LHV MHV NHV PHV dPHV QHV RHV SHV THV dTHV VHV WHV YHV ZHV Q AQ CQ DQ EQ FQ GQ HQ IQ KQ LQ MQ NQ PQ dPQ QQ RQ SQ TQ dTQ VQ WQ YQ ZQ IQ AIQ CIQ DIQ EIQ FIQ GIQ HIQ IIQ KIQ LIQ MIQ NIQ PIQ dPIQ QIQ RIQ SIQ TIQ dTIQ VIQ WIQ YIQ ZIQ XV AXV CXV DXV EXV FXV GXV HXV IXV KXV LXV MXV NXV PXV dPXV QXV RXV SXV TXV dTXV VXV WXV YXV ZXV V AV CV DV EV FV GV HV IV KV LV MV NV PV dPV QV RV SV TV dTV VV WV YV ZV Y AY CY DY EY FY GY HY IY KY LY MY NY PY dPY QY RY SY TY dTY VY WY YY ZY FY AFY CFY DFY EFY FFY GFY HFY IFY KFY LFY MFY NFY PFY dPFY QFY RFY SFY TFY dTFY VFY WFY YFY ZFY SL ASL CSL DSL ESL FSL GSL HSL ISL KSL LSL MSL NSL PSL dPSL QSL RSL SSL TSL dTSL VSL WSL YSL ZSL SH ASH CSH DSH ESH FSH GSH HSH ISH KSH LSH MSH NSH PSH dPSH QSH RSH SSH TSH dTSH VSH WSH YSH ZSH AL AAL CAL DAL EAL FAL GAL HAL IAL KAL LAL MAL NAL PAL dPAL QAL RAL SAL TAL dTAL VAL WAL YAL ZAL ALL AALL CALL DALL EALL FALL GALL HALL IALL KALL LALL MALL NALL PALL dPALL QALL RALL SALL TALL dTALL VALL WALL YALL ZALL AH AAH CAH DAH EAH FAH GAH HAH IAH KAH LAH MAH NAH PAH dPAH QAH RAH SAH TAH dTAH VAH WAH YAH ZAH AHH AAHH CAHH DAHH EAHH FAHH GAHH HAHH IAHH KAHH LAHH MAHH NAHH PAHH dPAHH QAHH RAHH SAHH TAHH dTAHH VAHH WAHH YAHH ZAHH