Operation - Burkert 8112 Mode D'emploi

Product description
Functional principle
Supply
8
It is designed for industrial use in all areas of process
technology and can be used in liquids.
Typical applications are overfill and dry run protection. The
small tuning fork allows the use in all kind of tanks and vessel.
Thanks to its simple and rugged measuring system, LEVEL
SWITCH 8112 is virtually unaffected by the chemical and
physical properties of the liquid.
It functions even under difficult conditions such as turbulence,
air bubbles, foam generation, buildup, strong external vibration
or changing products.
Fault monitoring
The electronics module of LEVEL SWITCH 8112 continuously
monitors via frequency evaluation the following criteria:
Strong corrosion or damage on the tuning fork
l
loss of vibration
l
Line break to the piezo drive
l
If a malfunction is detected or in case of power failure, the
electronics takes on a defined switching condition, i.e. the
relay deenergises (safe condition).
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 1200 Hz. The
piezos are fixed mechanically and are hence not subject to
temperature shock limitations. The frequency changes when
the tuning fork is covered by the medium. This change is
detected by the integrated oscillator and converted into a
switching command.
LEVEL SWITCH 8112 is a compact instrument, i.e. it can be
operated without external evaluation system. The integrated
electronics evaluates the level signal and outputs a switching
signal. With this switching signal, a connected device can be
operated directly (e.g. a warning system, a PLC, a pump etc.).
The data for power supply are stated in chapter "Technical
data" in the "Supplement".

3.3 Operation

The switching condition of LEVEL SWITCH 8112 can be
checked when the housing is closed (signal lamp). With the
basic setting, products with a density >0.7 g/cm³ (0.025 lbs/in³)
can be detected. The instrument can be adapted if products
with lower density should be measured.
LEVEL SWITCH 8112 - with relay output