Design And Measuring Principle - Burkert 8045 Mode D'emploi

6.3 DESIGN AND MEASURING PRINCIPLE

Design
The 8045 compact flow transmitter combines a flow sensor and a transducer with
display within a splash-proof IP65 plastic enclosure.
The base of the sensor finger contains a solenoid and 2 electrodes which are
in contact with the fluid to detect the induced voltage.
The electronic module converts the induced voltage into a flow value which
can be displayed.
The transducer uses a 3-wire circuit and requires a power supply of 18-36 VDC.
The output signals are provided via one or two cable glands.
For additional control adjustable relays can be used (optional).
Measuring Principle
According to the induction law, a voltage is induced when a conductor is present
within a magnetic field. The space between the 2 electrodes is filled with the
conductive fluid creating a conductor.
Through movement of the conductive fluid (min 20µS/cm) perpendicular to the
magnetic field which is provided by the solenoid produces a proportional
voltage to the flow velocity.
This voltage is detected between the electrodes and is then converted and
filtered according to the K-factor selected.
The flow direction generates a positive or a negative value of the flow. The
magnetic flow transmitter 8045 measures a flow velocity from 0.1 m/s
(0.3 ft/s).
A 4-20 mA standard signal, proportional to the flowrate is available as an
output signal.
In case of electronic failure a 22 mA signal is provided.
Pipe
8045
INFORMATION
39
Fluid Control Systems