Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
1 – 29
Volume 1 5 Electrical installation
1
5 Electrical installation
Electrical installations may be carried out only by a specialist elec-
trician.
Electrical shock hazard
Danger, electric shock!
Open the housing only to carry out installation, maintenance and
repair work.
If the housing is open, you may get in contact with live parts if the
power supply is turned on. During installation and servicing on the
hardware of the Level Gauge Uni-Probe LB 490 you have to discon-
nect the system, possibly connected relay contacts and all in- and
outputs from power to avoid getting in contact with live parts.
Danger of explosion when opening the housing in an explosive
atmosphere!
You may open the housing only 30 minutes after switching off the
voltage of all in- and outputs and possibly connected relay contacts
and the power supply.
The cooling-off time of 30 minutes ensures that possibly over-
heated components have enough time to cool off and cannot ignite
the explosive atmosphere.
The screw threads for the cover, on the housing and also on the
cover, must not be damaged, as otherwise explosion protection is
no longer guaranteed.
Before closing, make sure that the threads are clean and greased
with OKS 217.
Close the housing carefully with the housing cover before turning
on the line voltage. Fix the housing cover completely onto the
housing with screws and tighten it using a torque of 25Nm (refer-
ence value).
Unused conduits must be closed by a dummy plug suitable for the
respective type of protection, see chapter "5.3 Dummy Plug" on
page 2–249.
Modifications on the installation may not be carried out without
detailed knowledge of this User’s Manual.
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