… and apparatus for measuring or checking the flow, level, pressure or other variables of liquids or gases (for example, flow meters, level gauges, manometers, heat meters), excluding …
Explanatory notes
… and apparatus for measuring or checking the flow, level, pressure or other variables of liquids or gases (for … comprise essentially : (i) a primary device (e.g., Pitot or Venturi tube, simple diaphragm, orifice plates, shaped … or using ultrasound. Vacuum gauges for measuring very low pressures, including ionisation gauges using …