Tecfluid FLOMID Series User Manual
Page 2
2
WORKING PRINCIPLE
The Flomid electromagnetic 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 V
m
, proportional to the liquid velocity.
Two electrodes in contact with the liquid and positioned perpendicular to the magnetic field, sense
this voltage V
m
.
V
m
= B·v
m
·D
RECEPTION
The FLOMID electromagnetic flowmeters are supplied conveniently packed for transport together
with their instruction manual for installation and operation.
All the flowmeters have been verified in our calibration rigs to obtain the factor Fc for each sensor.
Disassembly
Unpack the instrument carefully, removing any remains of the packing from the inside of the
sensor. Do not remove the grease from the neck that couples to the electronics housing.
Storage temperature
Sensors linings of : PTFE and PVDF -20ºC ...... +60ºC
PP and EBONITE -5ºC ...... +50ºC
HANDLING
Where:
V
m
= Measured voltage in the electrodes.
B = Magnetic flux density
v
m
= Average liquid velocity
D = Pipe diameter.
It should always be done with care and
without knocks.
The large diameter sensors have rings
for holding the elevation elements. If the
flowmeter is held using slings, these
should hold on the sensor and not on the
electronics housing (see the drawing).