Burkert 8110 Mode D'emploi page 7

Application area
Functional principle
Voltage supply
LEVEL SWITCH 8110 • With extended status indication
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3.2 Principle of operation
LEVEL SWITCH 8110 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. With a tuning
fork of only 38 mm length, LEVEL SWITCH 8110 can be also mounted
e.g. in pipelines from DN 25. The small tuning fork allows use in
vessels, tanks and pipes. Thanks to its simple and robust measuring
system, LEVEL SWITCH 8110 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.
Function monitoring
The electronics module of LEVEL SWITCH 8110 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 output is open (safe
condition).
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 1100 Hz. When the tuning
fork is submerged in the product, the frequency changes. This change
is detected by the integrated electronics module and converted into a
switching command.
LEVEL SWITCH 8110 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".
3.3 Operation
The switching status of LEVEL SWITCH 8110 can be checked with
closed housing (signal lamp). Products with a density > 0.7 g/cm³
(0.025 lbs/in³) can be detected.
3 Product description
7