Siemens SITRANS LVL200E 사용 설명서 - 페이지 9
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Application area
Functional principle
Voltage supply
*7ML19985KY01*
3.2
Principle of operation
SITRANS LVL200E is a point level sensor with tuning fork for point
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, SITRANS LVL200E 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 LVL200E 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 one of these faults is detected or if the power supply fails, the elec-
tronics takes on a defined output status (safe state).
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.
SITRANS LVL200E 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
Operation
With the factory setting, products with a density ≥ 0.7 g/cm³
(0.025 lbs/in³) can be detected. The instrument can be adapted to
products with lower density.
On the electronics module you will find the following display and
adjustment elements:
•
Signal lamp for indication of the switching condition (green/red)
•
DIL switch for sensitivity adjustment
•
Mode adjustment for selection of the switching condition (A/B)
SITRANS LVL200E - Operating Instructions
9