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With a target flowmeter is a better choice. As long as the Reynolds number in line with target flowmeter measurement range, it can be measured, without regard to changes in viscosity. Also can be equipped with a temperature sensor density correction, so you can ensure a good accuracy.

Reynolds number flow with the pipe size, viscosity, and pipe diameter media related. The data presented here can be given, in the 50 caliber, 7 cubic meters / hour flow rate, target flowmeter can measure viscosity 80mpas medium, the viscosity of heavy oil is generally 7mpas.