8
3 Product description
OPTISWITCH 3200 C • NAMUR
31357-EN-210702
3.2 Principle of operation
OPTISWITCH 3200 C is a point level sensor with tuning fork for point
level detection.
It is designed for industrial use in all areas of process technology and
is preferably used for bulk solids.
Typical applications are overfill and dry run protection. Thanks to its
simple and robust measuring system, OPTISWITCH 3200 C is virtu-
ally unaffected by the chemical and physical properties of the bulk
solid.
It also works when subjected to strong external vibrations or changing
products.
Solid detection in water
If OPTISWITCH 3200 C was ordered for solids detection in water, the
tuning fork is set to the density of water. In air or when immersed in
water (density: 1 g/cm³/0.036 lbs/in), OPTISWITCH 3200 C signals
"uncovered". Only when the vibrating element is also covered with
solids (e.g. sand, sludge, gravel etc.) will the sensor signal "covered".
Function monitoring
The electronics module of OPTISWITCH 3200 C continuously moni-
tors the following criteria:
•
Correct vibrating frequency
•
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 electronics module and
converted into a switching command.
OPTISWITCH 3200 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 data for power supply are specified in chapter "
Technical data
".
3.3 Adjustment
On the electronics module you will find the following display and
adjustment elements:
•
Control lamp for indication of the switching status (yellow)
•
Potentiometer for adaptation to the product density
•
Mode switch to select the switching condition (reverse character-
istics)
•
Simulation key
Application area
Functional principle
Voltage supply
