TUR
page 4 TUR K02/0618
4. Regulation Use
The TUR series units are used for the flow measurement of liquids. These units
are furnished with the following outputs.
Pulse Output
Rotary motion of the turbine a signal with a specific frequency.
Analogue Output
In order to transduce the measured flow data, an analogue output is available,
(DIN IEC 381) with 0-20 mA, 4-20 mA or 0-10 V (see Type-tag).
Only low-viscosity media flows that are chemically compatible with the sensor
housing materials may be measured. With higher-viscosity media, considerable
measurement-errors will occur.
Long fibre-pieces may jam the rotor.
5. Operating Principle
The unit comprises a thick-walled plastic pipe; rotatable PVC flanges are secured
at each end.
At the meter inlet and outlet bearing supports help to reduce media turbulence. A
turbine-wheel with a core of moulded soft iron rotates as the liquid flows trough
the body.
The metallic parts are not exposed to the medium and are therefore protected
against corrosion. The bearings are made of sapphire and are self adjusting.
The bearings are made of chemically highly resistant Wolfram-carbide and are
moulded into the turbine wheel. The rotation is sensed through the built in pulse
transmitter, which requires no sealing and has now mechanical connection with
the turbine wheel. This rotation is converted into pulses by the associated
electronics.
The version with integrated transducer converts the frequency into a standard-
analogue signal. An optionally available, external electronic unit processes the
pulse output-signal to drive a display, allows limit contact produces an analogue
output or indicate the measure of flowing volume.
