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Re: [Phys-l] Electromagnetic flow meter ?



Yes, the conductive sensors are in contact with water, there are in an horizontal plane.B vector is in vertical plane.
The direction of the electromotive force is based on Fleming's right-hand rule


-----Mensaje original-----
De: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-bounces@carnot.physics.buffalo.edu] En nombre de Bob Sciamanda
Enviado el: lunes, 15 de diciembre de 2008 12:54
Para: Forum for Physics Educators
Asunto: Re: [Phys-l] Electromagnetic flow meter ?

As a first, cheap shot, are your conductive sensors on the INSIDE of the tube - in electrical contact with the fluid? Also, check the direction of the B field.

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
trebor@winbeam.com
http://www.winbeam.com/~trebor/
----- Original Message -----
From: "CARABAJAL PEREZ, MARCIAL ROBERTO" <mcarabajalp@ypf.com>
To: <phys-l@carnot.physics.buffalo.edu>
Sent: Monday, December 15, 2008 7:46 AM
Subject: [Phys-l] Electromagnetic flow meter ?


Hello:

We are trying to develop a lab experience building an electromagnetic liquid flow meter 'magmeter'. We know that the operation of a magnetic flowmeter is based upon Faraday's Law, which states that the voltage induced across any conductor as it moves at right angles through a magnetic field is proportional to the velocity of that conductor.

The liquid is salted water flowing at 1 m/s speed.
As a tube, there is an hypodermic syringe (1.25 cm diameter), with two conductive sensors in oposite sides.
The magnetic field is provided by a 300 turns coil reeled on a TV flyback ferrite nucleus, with a trasversal area of 1.5 cm2.
The driving current is 2 A alternate current (50 Hertz).
In the ferrite nucleus, there is a 1.25 cm gap, wide enough to hold the tube (hypodermic syringe) inside it.

We expected an induced voltage, suitable to be observed in an osciloscope, but we can´t measure any useful signal.
Has somebody carried out a similar experience? . Any suggestion?

My best regards.
Roberto



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