Siemens SITRANS LVL100 Руководство по эксплуатации - Страница 8

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Siemens SITRANS LVL100 Руководство по эксплуатации
Product description
Area of application
Functional principle
Supply voltage
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Technical data
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Article numbers, documentation
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3.2 Principle of operation

SITRANS LVL100 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 40 mm length, SITRANS LVL100 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, SITRANS LVL100 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 SITRANS LVL100 continuously
monitors via frequency evaluation the following criteria:
Strong corrosion or damage on the tuning fork
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loss of vibration
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Line break to the piezo drive
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If a malfunction is detected or in case of power failure, the
electronics takes on a defined switching condition, i.e. the
contactless electronic switch opens (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.
SITRANS LVL100 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.).
SITRANS LVL100 l CONTACTLESS ELECTRONIC SWITCH