KROHNE OPTISWITCH 4000C Contactless EN - Manual (Page 6)

fork allows use in vessels, tanks and pipes. Thanks to its
simple and robust measuring system, OPTISWITCH 4000 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 4000 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 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.
OPTISWITCH 4000 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".
3.3 Operation
The switching status of OPTISWITCH 4000 C can be checked
with closed housing (signal lamp). Products with a density
>0.7 g/cm³ (>0.025 lbs/in³) can be detected.
3.4 Storage and transport
Your instrument was protected by packaging during transport.
Its capacity to handle normal loads during transport is assured
by a test according to DIN 55439.
Physical principle
Power supply
Packaging
6 OPTISWITCH 4000 C - with contactless electronic switch
Product description
31762
-EN
-060830