SICK LFV 200 Manual De Instrucciones página 16

4 Connecting to power supply
3.2 Mounting instructions
Welded socket
For threaded versions of LFV 200 in combinati-
on with a mounting boss with O-ring in front and
welding marking.
LFV 200 with thread sizes ½", ¾" and 1" have a
defined thread. This means that every LFV 200
is in the same position after being screwed in.
Remove therefore the supplied flat seal from the
thread of LFV 200. This flat seal is not required
when using a welded socket with front-flush
seal.
Before welding, unscrew LFV 200 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. 15: 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 200. 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 200 gene-
rates as little resistance as possible to product
flow, mount the sensor so that the surfaces are
parallel to the product movement.
16
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
1
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.
Examples for typical applications:
•
•
•
For the plug version valve plug ISO 4400, stan-
dard cable with round wire cross-section can be
used. Cable diameter 4.5 ... 7 mm, protection
IP65.
Abb. 16: Wiring plan, contactless electronic switch with
valve plug ISO 4400
1
2
3
P
E
R
L
Transistor output
For connection to binary inputs of a PLC.
For the plug version valve plug ISO 4400, stan-
Connecting to power
supply
Preparing the connection
Connect only in the complete absence of
line voltage
Wiring plan
Load resistance at 24 V DC: 88 ... 1800 Ω
Rated power, relay 253 V AC: > 2.5 VA
Rated power, relay 24 V AC: > 0.5 VA
1 2
3
3
R
L
L1+ N-
PE PE
1
Max. level detection
Min. level detection
Fuse for cable protection
Protective ground
Load resistance (contactor, relay, etc.)
LFV 200 • Hygienic version
1 2
3
3
R
L
L1+ N-
2