KROHNE OPTISWITCH 3000C Transistor EN - Manual (Page 7)

Fault monitoring
The electronics of OPTISWITCH 3000 C continuously mon-
itors the following criteria:
l
Correct vibrating frequency
l
Line break to the piezo drive
If one of the stated malfunction is detected or in case of power
failure, the electronics takes on a defined switching condition,
i.e. the output transistor blocks (safe condition).
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 150 Hz. When the
tuning fork is submerged in the product, the vibration
amplitude changes. This change is detected by the integrated
oscillator and converted into a switching command.
OPTISWITCH 3000 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
OPTISWITCH 3000 C can detect products with a density
>0.08 g/cm³ (>0.003 lbs/in³).
On the electronics module you will find the following indicating
and adjustment elements:
l
signal lamp for indication of the switching condition (green/
red)
l
Mode switch for selecting the switching condition (min./
max.)
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.
The packaging of standard instruments consists of environ-
ment-friendly, recyclable cardboard. In addition, the sensor is
provided with a protective cover of cardboard. For special
versions PE foam or PE foil is also used. Dispose of the
packaging material via specialised recycling companies.
Physical principle
Power supply
Packaging
OPTISWITCH 3000 C - with transistor output 7
Product description
30060
-EN
-060830