Promag 50/53 W
Hauser
Function and system design
Faraday’s law of induction states that a voltage is induced in a conductor moving in a
magnetic field.
In electromagnetic measuring, the flowing medium corresponds to the moving
conductor. The induced voltage is proportional to the flow velocity and is detected by
two measuring electrodes and transmitted to the amplifier. Flow volume is computed
on the basis of the pipe’s diameter. The constant magnetic field is generated by a
switched direct current of alternating polarity.
Ue = B · L · v
Q
= A · v
Ue = induced voltage
B
= magnetic induction (magnetic field)
L
= electrode gap
v
= flow velocity
Q
= volume flow
A
= pipe cross-section
I
= current strength
The measuring system consists of a transmitter and a sensor.
Two versions are available:
•
Compact version: transmitter and sensor form a single mechanical unit.
•
Remote version: transmitter and sensor are installed separately.
Transmitter:
•
Promag 50 (user interface with push buttons for operation, two-line display)
•
Promag 53 (“Touch Control” without opening the housing, four-line display)
Sensor:
•
Promag W, 1” to 78” (DN 25 to 2000)
Measuring system
Measuring principle
2
V
I
I
