VEGA EL 4 Conductive probe - Manual (Page 12)

5 Connecting to power supply
5 .1 Preparing the connection
Always keep in mind the following safety instructions:
l Connect only in the complete absence of line voltage
You can find the electrical connection of EL 4 in the operating
instructions manual of the corresponding signal conditioning instru-
ment.
You can find suitable signal conditioning instruments in chapter
"T
echnical data".
The instrument is connected with standard two-wire cable without
screen. If electromagnetic interference is expected which is above the
test values of EN 61326 for industrial areas, screened cable should be
used.
Use cable with round cross-section. A cable outer diameter of 5 … 9 mm
(0.2 … 0.35 in) ensures the seal effect of the cable gland. If you are
using cable with a different diameter or cross-section, exchange the
seal or use a suitable cable gland.
5 .2 Wiring plan
You can find the electrical connection of EL 4 in the operating
instructions manual of the corresponding signal conditioning instru-
ment.
To realize a line monitoring with a VEGATOR 631 signal conditioning
instrument, a resistor of 220 kΩ must be integrated in the connection
housing of the probe between terminal 1 and 2.
When a fault message is generated, the switching output is
simultaneously activated.
If a fault message is not wanted, a bridge must be provided on the
signal conditioning instrument instead of the resistor in the connection
housing of the probe.
The line monitoring is thus deactivated and the fault message
rendered invalid.
Take note of the operating instructions manual of the signal
conditioning instrument.
With Ex versions, this 220 kΩ resistor is already integrated ex factory in
the connection housing of the probe. The Ex measuring system (max.
and ground connection cable of the probe to the signal conditioning
instrument) is generally monitored for line break.
l Terminal 1 = longest rod (ground)
Note safety instructions
Voltage supply
Connection cable
Connection compart-
ment
Line monitoring with
VEGATOR 631
12 Conductive probe EL 4
5 Connecting to power supply
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-EN
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