KROHNE OPTISWITCH 3000C NAMUR 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 these faults is detected, the electronics signals this via
a defined current to the signal conditioning instrument. The
connection cable to the vibrating element is also monitored.
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 with NAMUR electronics can be
connected to different NAMUR amplifiers depending on your
requirements. The specifications for NAMUR amplifiers are
available in the "Technical data".
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 (yellow)
l
Mode switch to select the switching condition (reverse
characteristics)
l
Simulation key
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 NAMUR output 7
Product description
31355
-EN
-060830