Q. What is the orifice meter working principle?

Fluid and gas flow rates may be determined with the use of a device called an orifice meter. It is made up primarily of a meter tube an orifice plate and housing for the orifice plate. Using the below principles of Differential Pressure Measurement achieves its effects.The orifice plate is used to measure the flow rate of the fluid or gas being measured.Since the pressure across the orifice plate changes with flow rate the pressure at the exit is higher than the pressure at the input.The velocity of the flowing liquid or gas may be determined by measuring the pressure drop caused by it.