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J N Thermocontrol offer an Industrail flowmeter used to measure flow rate of liquids and gases. it operated on the Variable Area Principle, where the fluid flow raises a float in taper tube increasing the area of passage of fluid.
The greater the flow, the higher the float is raised the height of float is raised by a combination of the buoyance of the liquid and velocity head of the fluid. With gases, the buoyancy is negligible,and float responds to the velocity head alone.
The taper glass tube is formed of Borosilicate glass of extremely high accuracy of bore obtained by collapsing the taper tube while in hot and plastic state on pricision ground and polished mandril. The tubes are then annealed in furnace to relieve the stress formed during manufacturing.