… the flow, level, pressure or other variables of liquids or gases (for example, flow meters, level gauges, manometers, …
Explanatory notes
… or checking apparatus generally incorporates an element sensitive to variations in the quantity to be measured (e.g., Bourdon tube, diaphragm, bellows, semiconductors) moving a needle or a pointer. In some … tube, simple diaphragm, orifice plates, shaped nozzle) to set up a differential pressure, and (ii) a differential …