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KROHNE OPTISWITCH 3200C Transistor EN User Manual

Page 8

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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 virtually unaffected by the chemical and physical

properties of the bulk solid.
It functions even when exposed to strong external vibration or

changing products.
Solid detection in water

If OPTISWITCH 3200 C was ordered for detection of solids in

water, the tuning fork is adjusted to the density of water. In the

air or when covered by water (density: 1 g/cm³/0.036 lbs/in)

OPTISWITCH 3200 C signals "uncovered". Only if the

vibrating element is also covered with solids (e.g. sand,

sludge, gravel etc.) will the sensor signal "covered".
Fault monitoring

The electronics of OPTISWITCH 3200 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 3200 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".

Physical principle

Power supply

8

OPTISWITCH 3200 C - with transistor output

Product description

29958

-EN
-060830