POSITIVE DISPLACEMENT FLOW METER CALIBRATION

A positive displacement flow meter is the only flow measuring technology to directly measure the volume of the fluid that passes through it. It works by trapping pockets of fluid between rotating components housed within a high precision chamber.

The volume that passes through the flowmeter is recorded with a geared mechanical register or used to give an output of so many pulses.
In this write-up, we’ll be covering in detail about positive displacement flow meters, and also list steps to calibrate this device.

How It Works

As mentioned, positive displacement flow meters depend on moving parts to displace fluid through them, and these parts must be locked against each other to avoid leakage. Although the parts in individual flow meters can vary based on the design, all such devices are built with the following components:
  • High precision measuring Chamber
  • Rotating Components
  • Inlet & Outlet
Here the fluid enters the measuring chamber through the inlet and proceeds to rotate the rotor. Based on the speed at which the rotor rotates, the subsequent volumetric flow rate is calculated. Once it’s done, the fluid exits the meter through the outlet.
Typically, in positive displacement meters, the rotors are made up of two gears that are aligned to each other either horizontally or vertically. The gears here create a seal within the chamber and thereby block the fluid to be measured for a short period before it leaves the chamber.

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