Tecfluid FLOMAT Series - Manual (Page 3)

3
1 WORKING PRINCIPLE
The Flomat electromagnetic insertion flowmeters are based on Faraday’s induction law.
When an electrically conductive liquid flows through a magnetic field, perpendicular to the
flow direction, it induces a voltage E, proportional to the liquid velocity.
Two electrodes in contact with the liquid and positioned perpendicular to the magnetic
field, capture this voltage E.
2 RECEPTION
The Flomat electromagnetic flowmeters are supplied ready for their installation and
operation.
They are also supplied packaged for their protection during storage and haulage.
All the flowmeters have been tested in our calibration rigs to obtain the Fc factor for each
sensor. For more information about the Fc factor, see point 6.1, page 9 of this manual.
2.1 Unpacking
Carefully unpack the instrument, removing any packaging material that could be attached
to the sensor. Do not remove any grease from the collar that fits the sensor to the
electronics housing.
2.2 Storage temperature
-20ºC ...... +60ºC
2.3 Handling
This should always be done with care and without knocks.
3 INSTALLATION
This should be made in a point that guarantees that the pipe is always completely full and
where a turbulent flow profile is completely developed (follow recommendations in point
3.2)
Avoid high points of the pipes where air pockets usually form, or pipes with falling flow
where it can form a vacuum.
Partially full pipes can produce important reading errors.
If the point where the Flomat should be installed has a discharge point near to it, it is
necessary to install a siphon in order to avoid any stagnant air in the sensor, as shown in
the following figure.
E = B·v·d
Where:
E = Measured voltage in the
electrodes
B = Magnetic flux density
v = Average liquid velocity
d = Distance between electrodes