Siemens SITRANS LVL100 Руководство по эксплуатации - Страница 8
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Functional principle
Voltage supply
8
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 bub-
bles, foam generation, buildup, strong external vibration or changing
products.
Function monitoring
The electronics module of SITRANS LVL100 continuously monitors
the following criteria via frequency evaluation:
•
Strong corrosion or damage on the tuning fork
•
Loss of vibration
•
Line break to the piezo drive
If a malfunction is detected or in case of voltage supply, the electron-
ics takes on a defined switching status, i.e. the output is open (safe
state).
The tuning fork is piezoelectrically energised and vibrates at its me-
chanical 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.
SITRANS LVL100 is a compact instrument, i.e. it can be oper-
ated 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
Adjustment
The switching status of SITRANS LVL100 can be checked when
the housing is closed (signal lamp). Products with a density > 0.7 g/
cm³ (0.025 lbs/in³) or ordered optionally with a density > 0.5 g/cm³
(0.018 lbs/in³) can be detected.
3.4
Supplementary cleaning procedures
3.4.1 Oil, grease and silicone-free
The SITRANS LVL100 is also available in the version " Oil, grease
and silicone-free". These instruments have passed through a special
cleaning procedure to remove oil, grease and paint-wetting impair-
ment substances (PWIS).
The cleaning is carried out on all wetted parts as well as on surfaces
accessible from outside. To keep the purity level, the instruments are
immediately packed in plastic foil after the cleaning process. The
purity level remains as long as the instrument is kept in the closed
original packaging.
SITRANS LVL100 - Operating Instructions