Burkert Type 8112 - Manual (Page 8)

l Article numbers, documentation
In addition to the type label outside on the instrument, you find the
serial number also inside the instrument.
3 .2 Principle of operation
LEVEL SWITCH 8112 is a point level sensor with tuning fork for level
detection.
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 use in all kinds of tanks and vessels. 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:
l Strong corrosion or damage on the tuning fork
l Loss of vibration
l Line break to the piezo drive
If one of these faults is detected or if the power supply fails, the
electronics takes on a defined output status (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 electronics
module 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 pump etc.).
The data for power supply are specified in chapter "Technical data".
Application area
Functional principle
Voltage supply
8 LEVEL SWITCH 8112 • with NAMUR output
3 Product description
32052
-EN
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