SICK LFV 230 Manual De Instrucciones página 16

4 Connecting to power supply
3.2 Mounting instructions
Welded socket
For threaded versions of LFV 230 in combinati-
on with a mounting boss with O-ring in front and
welding marking.
LFV 230 with thread sizes ½", ¾" and 1" have a
defined thread. This means that every LFV 230
is in the same position after being screwed in.
Remove therefore the supplied flat seal from the
thread of LFV 230. This flat seal is not required
when using a welded socket with front-flush
seal.
Before welding, unscrew LFV 230 and remove
the rubber ring from the welded socket.
The welded socket is provided with a marking
(notch). With horizontal mounting, weld the so-
cket with the notch facing upward or downward;
in pipelines (DN 25 to DN 50) aligned with the
direction of flow.
Abb. 16: Marking on the welded socket
1 Marking
Adhesive products
In case of horizontal mounting in adhesive and
viscous products, the surfaces of the tuning fork
should be vertical. The position of the tuning
fork is indicated by a marking on the hexagon of
LFV 230. With this, you can check the position
of the tuning fork when mounting it.
In case of horizontal mounting in adhesive
and viscous products, the tuning fork should
protrude into the vessel to avoid buildup on the
tuning fork.
Product flow
To make sure the tuning fork of LFV 230 gene-
rates as little resistance as possible to product
flow, mount the sensor so that the surfaces are
parallel to the product movement.
Agitators
Due to the effects of agitators, equipment vibra-
tion or similar, the level switch can be subjected
16
to strong lateral forces. For this reason, do not
use an overly long extension tube for LFV 230,
but check if you can mount a short vibrating le-
vel switch on the side of the vessel in horizontal
position.
Extreme vibration caused by the process or
the equipment, e.g. agitators or turbulence in
the vessel, can cause the extension tube of
LFV 230 to vibrate in resonance. This leads to
increased stress on the upper weld joint. Should
a longer tube version be necessary, you can
provide a suitable support directly above the
tuning fork to secure the extension tube.
1
Abb. 17: Lateral suppot of LFV 230
4
4.1
Note safety instructions
Always keep in mind the following safety
instructions:
•
4.2
Contactless electronic switch
The instrument is used for direct control of
relays, contactors, magnet valves, warning
lights, horns etc. It must not be operated without
intermediately connected load, because the
electronic would be destroyed if connected
directly to mains. It is not suitable for connection
to low voltage PLC inputs. Domestic current is
temporarily lowered below 1 mA after switching
off the load so that contactors, whose holding
current is lower than the constant domestic
current of the electronics (3 mA), are reliably
switched off.
Connecting to power
supply
Preparing the connection
Connect only in the complete absence of
line voltage
Wiring plan
LFV 230 • Hygienic version