Series M21; Introduction; Working Principle - Tecfluid M21 Series Instruction Manual

SERIES M21

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INTRODUCTION

The series M21 are flowmeters for liquids, gases and steam.
They are very robust instruments prepared to work under extreme conditions.
They have local flow rate indication by means of magnetic coupling, with scales calibrated in
l/h, m /h, kg/h, t/h, %, etc.
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They can fit switches or electronic transmitters that allow to detect a specific flow rate and
provide a flow rate signal to a remote device.
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WORKING PRINCIPLE

Based on variable area principle.
The flowmeter consists of a measuring tube and a float inside it. The flow pushes the float to
an equilibrium point. The area obtained between the float and the tube is proportional to the
flow rate.
The equilibrium point depends on:
where:
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E = Force of the fluid flow
•
Ff = Weight of the float
•
Al = Free area of flow
(Al = Ao, calibrated orifice area, - Af, float area)
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