Tecfluid LC Series User Manual

Float Level Switch

English Version

Series

instrumentation

for fluids

LC-30 / LC-31 / LC-M11 / LC-M12

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.
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.

C-MI-LC30 Rev.: 0

Technical Data

• Mounting: Vertical.

• Connection: DN-40 PN-16 DIN 2501 Flange.

R 1½” BSP thead.
(Others available on request).

• Maximum length: AISI-316 ... 6000 mm.
PVC, PTFE ... 2500 mm.
PVC, PTFE ... 6000 mm
(internal AISI-316).

• Precision: ± 2 mm.

• Hysteresis: ± 4 mm.

• Working pressure:

PN-16 AISI-316.
PVC, PTFE with internal AISI-316 tube.
PN-10 PVC, PTFE.

• Liquid temperature:

-20ºC...+150ºC en AISI-316, PTFE.
0ºC...+50ºC PVC.

• Ambient temperature:

-20ºC...+60ºC AISI-316, PTFE.
0ºC...+50ºC PVC.

• Liquid density: From 0,45 to 3 kg/l.

• Liquid viscosity: Maximum 1500 cSt.

• Contacts: Reed 1 A 220 V.

(maximum 9 with minimum separation
of 20 mm)
Conforms with Directive 73 / 23 / CEE

CONSTRUCTION

No. Piece Materials

1 Enclosure
2 Connection AISI-316 PVC PTFE

3 Rod AISI-316 PVC PTFE
4 Float AISI-316 PVC PTFE
5 Magnet Alnico Alnico Alnico
6 Reed switch - - ­7 Float stop AISI-316 PVC PTFE

LC-.../INOX LC-.../PVC LC-.../PTFE
DIN 43650/

Aluminium

OPERATION

Inside the guide tube, reed switches are mounted at the
alarm/control points..
As the float passes the position where a reed switch is
located, the magnetic field from the float actives the switch.
The maximum number of alarm or control points is 9.

2

DIN 43650/

Aluminium

DIN 43650/

Aluminium