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8045
ENGLISH
INFORMATION
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.
l The base of the sensor finger contains a solenoid and 2 electrodes which are
in contact with the fluid to detect the induced voltage.
l The electronic module converts the induced voltage into a flow value which
can be displayed.
l The transducer uses a 3-wire circuit and requires a power supply of 18-30
VDC. The output signals are provided via one (transmitter without relay) or via
two PG 13.5 (transmitter with relays).
l 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. By the magnetic-inductive principle of measurement the
space between the 2 electrodes is filled with the conductive fluid creating a conductor.
l Through movement of the conductive fluid (min 20mS/cm) perpendicular to the
magnetic field which is provided by the solenoid produces a proportional
voltage to the flow velocity which is induced within the fluid.
l This voltage is detected between the electrodes and can be converted and
filtered according to the K-factor selected.
l The flow direction generates a positive or a negative value of the flow. The
magnetic flow transmitter 8045 measures a flow velocity from 0.05 m/s
(0.15 ft/s).
l A 4-20 mA standard signal, proportional to the flowrate is available as an
output signal.
l In case of electronic failure a 22 mA signal is provided.
6.3
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