By-pass level indicator is suitable for measuring the level of aggressive liquids that emit hazardous vapours, or to protect the stored liquid from external atmosphere.
Vortex flow meters use a principle called the Karman effect to measure liquids, gases and vapors. In fluid dynamics, a Karman vortex lane is a repeating pattern of rotating (swirling)
Diaphragm seals are used commonly to isolate and protect pressure measuring instruments from the process medium in chemical processing and extreme process applications.