KROHNE OPTISWITCH 5100C 2wire EN - Manual (Page 8)

Thanks to its simple and robust measuring system, OPTI-
SWITCH 5100 C, 5150 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 5100 C, 5150 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, the electronics signals it via a
defined current to the signal conditioning instrument. The
connection cable to the sensor is also monitored on line break
and short-circuit.
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 1200 Hz. The
piezos are fastened mechanically and are hence not subject to
temperature shock limitations. When the tuning fork is
submerged in the product, the frequency changes. This
change is detected by the integrated oscillator, transferred to
the signal conditioning instrument as current value and
converted into a switching command.
Depending on your requirements, OPTISWITCH 5100 C, 5150
C with two-wire electronics can be connected to different
signal conditioning instruments. Compatible signal condition-
ing instruments are listed under "Technical data".
The exact range of the power supply is stated in the "Technical
data" in the "Supplement".
3.3 Operation
The switching condition of OPTISWITCH 5100 C, 5150 C with
plastic housing can be checked when the housing is closed
(signal lamp). With the basic setting, products with a density
>0.7 g/cm³ (>0.025 lbs/in³) can be detected. The instrument
can be adapted if products with lower density should be
measured.
Physical principle
Power supply
8 OPTISWITCH 5100 C, 5150 C - with two-wire output
Product description
30430
-EN
-060831