VEGA EL 4 Conductive probe - Manual (Page 7)

The type label contains the most important data for identification and
use of the instrument:
l Article number
l Serial number
l Technical data
l Article numbers, documentation
With the serial number, you can access the delivery data of the
instrument via www.vega.com, "VEGA Tools" and "serial number
search". In addition to the type label outside, you can also find the
serial number on the inside of the instrument.
3 .2 Principle of operation
EL 4 is a point level sensor with partly insulated conductive electrode
for level detection.
EL 4 is very rugged and can be used in all areas of industrial process
technology.
The level switch can be used in conductive liquids such as e.g. water.
Typical applications are overfill and dry run protection.
The conductive measuring principle places no special requirements on
installation. Hence, many different applications can be equipped with
EL 4.
Conductive probes detect the product resistance when their electro-
des are covered by the product.
The switching signal is determined by the length or mounting position
of the respective electrode.
A low alternating current flows through the electodes, is measured for
amplitude and phase position by the electronics of the signal
conditioning instrument and converted into a switching command.
EL 4 is operated with an external processing unit. The connected
signal conditioning instrument powers EL 4 and provides a switching
signal. A connected device can be activated directly with this switching
command (e.g. a warning system, a PLC, a pump, etc.).
You can find the exact range of the voltage supply in chapter
"T
echnical data" in the operating instructions manual of the signal
conditioning instrument.
3 .3 Operation
The probe does not have its own electronics. The measurement is
carried out via the connected signal conditioning instrument.
Type label
Application area
Functional principle
Voltage supply
Conductive probe EL 4 7
3 Product description
32653
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EN
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