KROHNE OPTISWITCH 5200C Namur EN - Manual (Page 8)

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, OPTISWITCH 5200 C, 5250
C 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, OPTI-
SWITCH 5200 C, 5250 C 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 OPTISWITCH 5200 C, 5250 C
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 oscillator and converted into a
switching command.
OPTISWITCH 5200 C, 5250 C 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 directly activated (e.g. a warning system, a PLC,
a pump etc.).
The exact range of the power supply is stated in the "Technical
data" in the "Supplement".
Physical principle
Power supply
8 OPTISWITCH 5200 C, 5250 C - with NAMUR output
Product description
30434
-EN
-060831