KROHNE LS 4100 EN - Manual (Page 9)

03/2002 LS 4100/LS 4150 9
Transport
Do not hold level switch on the tuning fork. The tuning fork can be damaged.
Polished version LS 4150
Treat instruments with polished tuning fork LS 4150 very carefully and do not touch the polished
surface. Unpack LS 4150 directly before mounting. Insert LS 4150 carefully into the provided
opening and avoid contact with vessel parts.
Cable entries
When mounting outside, on cooled vessels or in
humid areas in which e.g. cleaning is done with
steam or high pressure, the seal of the cable
entry is especially important. Use cable with
sufficient wire cross-section and tighten the
cable entry. For cables with too small wire
cross-section, a suitable reduction piece must
be used to ensure tightness of the cable entry.
Two seal rings are attached to the instrument to
ensure tightness also of cables with smaller
diameter. Use the smallest possible seal ring.
To avoid humidity ingress, the cable entry
should point downwards (see fig. 2.4).
Proceed as follows: Loosen the plug by
unscrewing the knurled ring. Loosen the
connection screw and remove the socket insert
out of the angular housing of the plug (see also
fig. 3.1 under "3.1 Connection instructions").
You can turn the angle housing of the plug in
60° steps (see fig. 2.5). With vertically mounted
LS 4150, loop the connection cable to the
instrument housing downwards so that rain and
condensation water can drain off.
Welded socket G 1 A
Level switch thread start is defined. This means that each is in the same position after screwing in.
Therefore remove the supplied seal from the thread of LS 4100/LS 4150. This seal is not required
when using a welded socket (G 1 A). Screw level switch into the welded socket.
You can determine the subsequent position of the level switch before welding (see also fig. 2.3).
Mark the appropriate position of the welded socket. Before welding, unscrew level switch and
remove the rubber ring from the socket.
An optional welded socket (G 1 A) is available
which is already provided with a notch. Weld
this socket with a marking facing up-wards.
Marking
Fig. 2.4
Fig. 2.5
Fig. 2.6