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.
Guide wires may be omitted.
Location of readout should be noted, at grade, at top, or accessible from a ladder.
Float with guide wires.
May be installed without stilling well.
May be installed through side of vessel.
Dip tube or other primary element and stilling well.
Radiation, multi-point or continuous.
Radiation, single point.
May be installed through top of vessel.
Ball float internally mounted in vessel.
Displacer internally mounted in vessel.
Open channel flume.
Vortex shedding flowmeter
Thermal mass flowmeter.
Positive displacement flowmeter.
Open channel weir plate.
Variable area flowmeter.
Annular orifice meter.
Averaging pitot tube.
Standard pitot tube.
Integral orifice plate.
Generic venturi tube, flow nozzle, or flow tube.
Multi-hole orifice plate
Circle quadrant orifice plate.
Eccentric circle orifice plate.
Concentric circle orifice plate.
Orifice plate in quick-change fitting.
Generic orifice plate.
Flame rod flame detector.
Television flame monitor.
Ultraviolet flame detector.
Fiberoptic sensing probe.
Dual element sensing probe.
pH, ORP, etc.
Single element sensing probe.
Conductivity, moisture, etc.