CADXChange instrumentation symbol library, ISA 5.1 style (DWG)
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191 symbols as AutoCAD blocks, drawn in millimetres at 1:1. Plain DWG (AutoCAD 2018 format), no add-in needed.
The symbols are drawn after the common ISA 5.1 forms (instrument bubbles by location and function, primary elements, instrument connections and signal lines, valves, actuators, regulators and safety devices).
They are our own drawings after the symbol tables of ANSI/ISA-5.1-2009, not copies of the standard, and the library is not certified against it. Check your company or client standard before you rely on a shape.

Conventions
- One block per symbol, named ISA_<NAME>, all geometry on layer SYMBOL.
- Instrument bubbles: the insertion point is the centre of the symbol. The visible attributes TAG_FUNC (function letters, for example FIC) and
  LOOP_NO (loop number, for example 101) sit inside the bubble, above and below the location line. Other attributes (SERVICE, RANGE, SIGNAL_TYPE,
  IO_ADDRESS, CABINET, MANUFACTURER, MODEL ...) are invisible and show in the attribute editor (EATTEDIT, or double-click the block) and in exports.
- Valve bodies and control valve assemblies: the insertion point is the left pipe connection, both connections sit on a 5 mm grid. The visible attributes
  are VALVE_TAG and SIZE; control valves also carry FAIL_POSITION, CV and ACTUATOR. Actuators are inserted at the point on the valve stem (their stem
  starts at the insertion point and they stand above it). Primary elements are inserted at the centre of the symbol and show a TAG.
- Signal lines are 20 mm samples starting at the insertion point; draw longer lines with a polyline and copy the marks, or stretch the sample.
- DESC (invisible) holds the name of the symbol.
- Model space holds a catalog of all symbols (cells of 60 x 45 mm); the CATALOG layout shows it at 1:1 on an A2 sheet.
- To count the symbols or list their attributes in many drawings, export the blocks to Excel with BlockSync: https://cadxchange.net/blocksync

Symbols
Instrument bubbles
  ISA_DISCRETE_FIELD               Discrete, field
  ISA_DISCRETE_MAIN                Discrete, main panel
  ISA_DISCRETE_MAIN_REAR           Discrete, main, rear
  ISA_DISCRETE_AUX                 Discrete, aux. panel
  ISA_DISCRETE_AUX_REAR            Discrete, aux., rear
  ISA_SHARED_FIELD                 Shared (BPCS), field
  ISA_SHARED_MAIN                  Shared (BPCS), main panel
  ISA_SHARED_MAIN_REAR             Shared (BPCS), main, rear
  ISA_SHARED_AUX                   Shared (BPCS), aux. panel
  ISA_SHARED_AUX_REAR              Shared (BPCS), aux., rear
  ISA_SIS_FIELD                    Shared (SIS), field
  ISA_SIS_MAIN                     Shared (SIS), main panel
  ISA_SIS_MAIN_REAR                Shared (SIS), main, rear
  ISA_SIS_AUX                      Shared (SIS), aux. panel
  ISA_SIS_AUX_REAR                 Shared (SIS), aux., rear
  ISA_COMPUTER_FIELD               Computer, field
  ISA_COMPUTER_MAIN                Computer, main panel
  ISA_COMPUTER_MAIN_REAR           Computer, main, rear
  ISA_COMPUTER_AUX                 Computer, aux. panel
  ISA_COMPUTER_AUX_REAR            Computer, aux., rear

Miscellaneous devices
  ISA_SIGNAL_PROCESSING            Signal processing function
  ISA_PATCHBOARD_POINT             Patchboard / matrix point
  ISA_INTERLOCK                    Interlock logic function
  ISA_COMMON_HOUSING               Common housing
  ISA_PILOT_LIGHT                  Pilot light

Transmitter and element bubbles
  ISA_XMTR_CLOSE_COUPLED           Transmitter + element, close
  ISA_XMTR_REMOTE                  Transmitter + element, remote
  ISA_XMTR_GRAPHIC_INTEGRAL        Transmitter, element box
  ISA_XMTR_GRAPHIC_CLOSE           Transmitter, close elem. box
  ISA_XMTR_GRAPHIC_REMOTE          Transmitter, remote elem. box

Primary elements
  ISA_ELEM_PROBE_SINGLE            Analysis probe, single
  ISA_ELEM_PROBE_DUAL              Analysis probe, dual
  ISA_ELEM_FIBEROPTIC              Fiber-optic probe
  ISA_ELEM_FLAME_UV                UV / TV flame detector
  ISA_ELEM_FLAME_ROD               Flame rod detector
  ISA_ELEM_ORIFICE                 Orifice plate
  ISA_ELEM_ORIFICE_QUICK           Orifice, quick-change
  ISA_ELEM_ORIFICE_CONC            Orifice, concentric
  ISA_ELEM_ORIFICE_ECC             Orifice, eccentric
  ISA_ELEM_ORIFICE_QUAD            Orifice, quadrant
  ISA_ELEM_ORIFICE_MULTI           Orifice, multi-hole
  ISA_ELEM_VENTURI                 Venturi / nozzle, generic
  ISA_ELEM_VENTURI_TUBE            Venturi tube
  ISA_ELEM_FLOW_NOZZLE             Flow nozzle
  ISA_ELEM_FLOW_TUBE               Flow tube
  ISA_ELEM_ORIFICE_INTEGRAL        Integral orifice plate
  ISA_ELEM_PITOT                   Pitot tube, standard
  ISA_ELEM_PITOT_AVG               Pitot tube, averaging
  ISA_ELEM_TURBINE                 Turbine / propeller meter
  ISA_ELEM_VORTEX                  Vortex shedding meter
  ISA_ELEM_TARGET                  Target meter
  ISA_ELEM_MAGNETIC_M              Magnetic meter
  ISA_ELEM_MAGNETIC_COIL           Magnetic meter, coil
  ISA_ELEM_THERMAL_DT              Thermal mass meter, dT
  ISA_ELEM_THERMAL_DASH            Thermal mass meter, dashed
  ISA_ELEM_PD_METER                Positive displacement meter
  ISA_ELEM_CONE                    Cone / annular orifice meter
  ISA_ELEM_WEDGE                   Wedge meter
  ISA_ELEM_CORIOLIS                Coriolis meter
  ISA_ELEM_SONIC                   Sonic / ultrasonic meter
  ISA_ELEM_VARIABLE_AREA           Variable area meter
  ISA_ELEM_WEIR                    Weir plate
  ISA_ELEM_FLUME                   Flume
  ISA_ELEM_DISPLACER               Level displacer in vessel
  ISA_ELEM_BALL_FLOAT              Ball float in vessel
  ISA_ELEM_LEVEL_SONIC             Level, radiation / sonic
  ISA_ELEM_LEVEL_RADIATION         Level, radiation multi-point
  ISA_ELEM_DIP_TUBE                Dip tube / stilling well
  ISA_ELEM_FLOAT_GUIDE             Float with guide wires
  ISA_ELEM_INSERT_PROBE            Level insert probe
  ISA_ELEM_RADAR                   Level radar
  ISA_ELEM_PE_BUBBLE               Strain gage element, PE
  ISA_ELEM_TE_BUBBLE               Temperature element, TE

Secondary instruments
  ISA_SIGHT_GLASS                  Sight glass, flow (FG)
  ISA_GAGE_LEVEL_INTEGRAL          Level gage on vessel (LG)
  ISA_GAGE_LEVEL_EXTERNAL          Level gage glass, external
  ISA_GAGE_PRESSURE                Pressure gage (PG)
  ISA_GAGE_TEMPERATURE             Thermometer (TG)

Accessories
  ISA_ACC_SAMPLE_PROBE             Sample probe, flanged (AW)
  ISA_ACC_CONDITIONER              Sample conditioner (AX)
  ISA_ACC_STRAIGHTENER             Flow straightener (FX)
  ISA_ACC_PURGE                    Purge / flushing device
  ISA_ACC_DIAPHRAGM_SEAL           Diaphragm seal, flanged
  ISA_ACC_DIAPHRAGM_SEAL_W         Diaphragm seal, welded
  ISA_ACC_THERMOWELL               Thermowell, flanged (TW)

Instrument connections
  ISA_CONN_LINE                    Connection line
  ISA_CONN_LINE_TRACED             Traced connection line
  ISA_CONN_GENERIC                 Generic connection
  ISA_CONN_GENERIC_TRACED          Generic connection, traced
  ISA_CONN_INSTR_TRACED            Traced instrument
  ISA_CONN_FLANGED                 Flanged connection
  ISA_CONN_THREADED                Threaded connection
  ISA_CONN_SOCKET_WELDED           Socket welded connection
  ISA_CONN_WELDED                  Welded connection

Signal lines and connectors
  ISA_LINE_SUPPLY_AIR              Supply line, air (IA)
  ISA_LINE_SUPPLY_ELECTRIC         Supply line, electric (ES)
  ISA_LINE_SUPPLY_HYDRAULIC        Supply line, hydraulic (HS)
  ISA_LINE_UNDEFINED               Signal, undefined
  ISA_LINE_PNEUMATIC               Signal, pneumatic
  ISA_LINE_ELECTRIC                Signal, electric (dashed)
  ISA_LINE_SOLID                   Signal, solid line
  ISA_LINE_HYDRAULIC               Signal, hydraulic
  ISA_LINE_CAPILLARY               Signal, capillary tube
  ISA_LINE_GUIDED_WAVE             Signal, guided wave / fiber
  ISA_LINE_WIRELESS_WAVE           Wireless signal, wave
  ISA_LINE_WIRELESS_ZIGZAG         Wireless signal, zigzag
  ISA_LINE_DATA_LINK               Data link, shared system
  ISA_LINE_DATA_LINK_SYS           Data link, system to system
  ISA_LINE_FIELDBUS                Fieldbus link
  ISA_LINE_CALIBRATION             Calibration / smart link
  ISA_LINE_MECHANICAL              Mechanical link
  ISA_CONN_SIGNAL_ROUND            Drawing connector, round
  ISA_CONN_SIGNAL_ROUND_IN         Drawing connector, round in
  ISA_CONN_SIGNAL_POINTED          Drawing connector, pointed
  ISA_CONN_SIGNAL_POINTED_IN       Drawing connector, pointed in
  ISA_CONN_LOGIC_INPUT             Logic signal input
  ISA_CONN_LOGIC_OUTPUT            Logic signal output
  ISA_CONN_FUNC_SOURCE             Functional connector, source
  ISA_CONN_FUNC_RECEIVER           Functional connector, receiver

Valve bodies
  ISA_VALVE_GATE                   Gate valve / two-way valve
  ISA_VALVE_GLOBE                  Globe valve
  ISA_VALVE_ANGLE                  Angle valve
  ISA_VALVE_3WAY                   Three-way valve
  ISA_VALVE_4WAY                   Four-way valve
  ISA_VALVE_BUTTERFLY              Butterfly valve
  ISA_VALVE_BALL                   Ball valve
  ISA_VALVE_PLUG                   Plug valve
  ISA_VALVE_ECCENTRIC              Eccentric rotary disc valve
  ISA_VALVE_DIAPHRAGM_A            Diaphragm valve
  ISA_VALVE_DIAPHRAGM_B            Diaphragm valve, bowtie
  ISA_VALVE_PINCH                  Pinch valve
  ISA_VALVE_BELLOWS                Bellows sealed valve
  ISA_DAMPER                       Damper / louver, generic
  ISA_DAMPER_PARALLEL              Damper, parallel blade
  ISA_DAMPER_OPPOSED               Damper, opposed blade
  ISA_VALVE_SOL_2WAY               Solenoid valve, 2-way
  ISA_VALVE_SOL_ANGLE              Solenoid valve, angle
  ISA_VALVE_SOL_3WAY               Solenoid valve, 3-way
  ISA_VALVE_SOL_4WAY               Solenoid valve, 4-way
  ISA_PM_COUPLING                  Variable speed coupling, PM
  ISA_MOTOR                        Electric motor

Actuators
  ISA_ACT_DIAPHRAGM                Actuator, spring-diaphragm
  ISA_ACT_DIAPHRAGM_POS            Actuator, diaphragm + pos.
  ISA_ACT_BALANCED                 Actuator, pressure-balanced
  ISA_ACT_PISTON                   Actuator, linear piston
  ISA_ACT_PISTON_POS               Actuator, piston + positioner
  ISA_ACT_ROTARY                   Actuator, rotary piston
  ISA_ACT_ROTARY_POS               Actuator, rotary + positioner
  ISA_ACT_BELLOWS                  Actuator, bellows spring
  ISA_ACT_MOTOR                    Actuator, motor
  ISA_ACT_SOLENOID                 Actuator, solenoid
  ISA_ACT_HAND_SIDE                Actuator, side handwheel
  ISA_ACT_HAND_TOP                 Actuator, top handwheel
  ISA_ACT_MANUAL                   Actuator, manual (hand)
  ISA_ACT_ELECTROHYDRAULIC         Actuator, electrohydraulic
  ISA_ACT_PST_MANUAL               Actuator, PST device, manual
  ISA_ACT_PST_REMOTE               Actuator, PST device, remote
  ISA_ACT_SOL_AUTO                 Solenoid, automatic reset
  ISA_ACT_SOL_LATCH                Solenoid, manual reset
  ISA_ACT_SOL_LATCH2               Solenoid, manual+remote reset
  ISA_ACT_SPRING                   Actuator, spring relief
  ISA_ACT_PILOT                    Actuator, pilot relief

Regulators and safety devices
  ISA_REG_FLOW                     Automatic flow regulator
  ISA_REG_BACKPRESS_INT            Back-pressure reg., internal
  ISA_REG_BACKPRESS_EXT            Back-pressure reg., external
  ISA_REG_REDUCING_INT             Pressure reducing, internal
  ISA_REG_REDUCING_EXT             Pressure reducing, external
  ISA_REG_DIFF_EXT                 Differential reg., external
  ISA_REG_DIFF_INT                 Differential reg., internal
  ISA_REG_TEMPERATURE              Temperature regulator
  ISA_PSV_PRESSURE                 Pressure safety valve
  ISA_PSV_VACUUM                   Vacuum safety valve
  ISA_PSV_PRESS_VAC                Pressure-vacuum relief valve
  ISA_RUPTURE_PRESSURE             Rupture disk, pressure
  ISA_RUPTURE_VACUUM               Rupture disk, vacuum
  ISA_TRAP                         Moisture / steam trap

Control valve assemblies
  ISA_CV_DIAPHRAGM                 Control valve, diaphragm
  ISA_CV_DIAPHRAGM_POS             Control valve, diaph. + pos.
  ISA_CV_PISTON                    Control valve, piston
  ISA_CV_ROTARY                    Control valve, rotary piston
  ISA_CV_MOTOR                     Control valve, motor
  ISA_CV_SOLENOID                  Control valve, solenoid
  ISA_CV_HAND_SIDE                 Control valve, side handwheel
  ISA_CV_HAND_TOP                  Control valve, top handwheel
  ISA_CV_ELECTROHYDRAULIC          Control valve, electro-hyd.
  ISA_CV_FAIL_LABEL                Control valve, fail label (A)
  ISA_CV_FO                        Control valve, fail open (B)
  ISA_CV_FC                        Control valve, fail closed (B)
  ISA_CV_FL                        Control valve, fail locked (B)
  ISA_CV_FL_DO                     Control valve, FL / drift open (B)
  ISA_CV_FL_DC                     Control valve, FL / drift closed (B)

Free to use and modify in your own projects, including commercial ones. Provided as is, without warranty.
https://cadxchange.net/resources/symbol-libraries/instrumentation-isa-5-1
