8
User Manual v2.0
MAG
2. PRODUCT DESCRIPTION
2.1 OPERATING PRINCIPLE
The
MAG
has been designed with the aim of fulfillment of all the requirements of modern water management
systems, through a flexible and hybrid electronics which, depending on the model, offers various power
supply solutions.
An electromotive force is induced at the ends of
a conducting
fluid that moves with velocity
v
in a magnetic induction field
B
and can be expressed as:
e = kBDv
Where it i
s:
B
is constant by construction;
D
is constant and represents the distance
between the electrodes E1and E2 (equivalent
to the diameter of the flowmete
r);
v
is the fluid velocity;
k
is the calibration constant;
emf «e» is proportional to the velocity «v»
2.1.1 Bidirectional reading
The sensor has a possibility of bidirectional reading (i.e., it is able to read the flow of the liquid in both
directions).
By convention, the sensor will output positive values if the liquid flows:
»
in the same direction as the arrow (enters in – and exits in +)
, the flow is positive, and the display will show
a reading without a sign;
»
in the opposite direction to that indicated by the arrow (enters in + and exits in -)
, the flow is negative, and
the display will show a reading with a negative sign;
Electromotive force (proportional
to the velocity);
Electrodes;
Magnetic field;
Coils;
3
2
1
4
1
2
3
4
Direct flow -> number without sign
Reverse flow -> negative number
