Tecfluid LC Series - Manual

LC-30 / LC-31 / LC-M11 / LC-M12
Float Level Switch
Series
User’s Manual
RECEPTION
Check that the level instrument is mechanically correct by means of the
following inspection:
−
The float (4) slides smoothly along the rod (3) (do it carefully by hand
in moving the float up and down).
−
The rod (3) does not have any shock and is not bent.
−
The bottom float stop (7) at the rod is in place.
Check with a multimeter that when the float slides along the rod, the
reed switch is activated in changing the output from NO to NC or vice
versa (depending on the wiring according to attached diagram).
Check that the switching points correspond to the required ones.
Check that the float density is inferior than the density of the liquid and
that the float is in the correct position (the mark UP engraved at the top
of the float indicates that this side of the float must be up).
INSTALLATION
The mounting of the level switch is vertical. The float level varies
accordingly with the level of the liquid.
Mount the seal on the flange or the coupling thread.
Introduce with care the float through the mounting hole until the flange
or coupling thread couples with the tank. Fix the flange with the
appropriate nuts & bolts.
You could mount, if the installation so require, the float by the inside of
the tank, in removing the bottom float stop (7).
In the case of a coupling thread, turn until tight. Do not apply torques
greater than 60 Nm.
C-MI-LC30 Rev.: 0
English Version
instrumentation
for fluids
REED SWITCHES
The LC’s series has two types of contacts for
level indication, RSC and Bi-stable RBC. The
difference is in the status of the contact once
the float has passed the contact.
Series RSC
The RSC is a reed switch without “memory”. It
is only activated in presence of the magnetic
field of the float. If the float moves away from
position of the switch, the switch returns to it’s
non-active position, which is the same for the
float being above or below the switch.
This system provides an indication of when the
level is at the same position as the reed switch
but will not provide an indication of the level
away from this point. That is, it provides an
indication of actual level but not high or low
level.
Series Bi-stable RBC
The bi-stable RBC reed switch remains in it’s
switched position after the float has passed. It
will remain in one position when the float is
below and remains in the opposite position
while the float is above the reed switch. This
provides a High/Low indication but not indicate
the exact position of the level.