Density Meter LB 444 SECTION 4. CONNECTIONS
36
4. CONNECTIONS
4.1 Detector
Switch off the evaluation unit before connecting the scintillation counter,
Open the screws and remove the connection box cover to expose the connec-
tion area.
The detector is connected to terminals
1
and
2
on the evaluation unit via a 2-wire (2 x 1 mm
2
)
shielded standard cable. This cross-section al-
lows a maximum length of 750 m. When install-
ing the connection cable, make sure that water
cannot get into the connection room via the ca-
ble. With ambient temperatures >70°C, the in-
stalled cable has to be temperature-protected.
Following connection, check that the connection
housing is carefully closed and the cable bush-
ing properly sealed.
Figure 21: Cable connections at detector
If a resistance thermometer is connected, the cables coming from the
Pt 100
are
passed through the second cable bushing to terminals
3
and
4
.
For equipment installed in the Ex-area, please observe the special re-
quirements for the cable and the preparation of the connection wires.
The detector LB 44... must be used for installation in the Ex-area. The de-
tector LB 54.. may only be used for non Ex-applications.
The evaluation unit must always be installed outside the Ex-area.
A special transmission technique ensures that interference is suppressed. How-
ever, do not run measurement cables together with other power cables.
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2
3
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