Float switch Dimensions
Features
Function
Electrical connection
Release date 2007-07-12 13:51 Date of issue 2007-07-12 T3018_ENG.xml
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com
1
LFL2-**-U
• Switching element: microswitch,
mercury-free
• Limit value detection for fluids
• Sleeve design: small diameter,
mounting through G1 tap hole
possible
• Ball design: high buoyancy
Ball Ø86
Sleeve design LFL2-CK-U
Ball design LFL2-BK-U
Ø29.2
135
Cable colours when potential-free
black-brown = contact open
black-blue = contact closed
The microswitch (change-over contact) is integrated in a PP float and is activated
in the event of deviations from the horizontal position. The switching ball in the float,
which moves along an axis, activates the microswitch.
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com
2
Release date 2007-07-12 13:51 Date of issue 2007-07-12 T3018_ENG.xml
Float switch
LFL2-**-U
Technical data
Application
Description microswitch with switching ball, change-over contact
Function and system design
Equipment architecture This device may be used with any sequential circuit, as long as the circuit can support the electrical circuit
values of the switching elements.
Auxiliary energy
Supply voltage max. 250 V AC, 150 V DC
Current consumption max. 3 (1) A
Operating conditions
Mounting conditions
Installation instructions range of application and minimum length between mounting and float:
- PVC version: ≥ 50 mm (2 in), preferred for water, waste water, slightly aggressive liquids
- PUR version: ≥ 100 mm (4 in), preferred for fuels, heating oils, oily fluids
- CSM/CM version: ≥ 100 mm (4 in), preferred for many acids and lyes
mounting:
- The float switch is mounted either from sidewards through a cable gland ≥ G1A into the vessel or
- by means of a counter weight or rods (e. g. float switch assembly) from the top.
- The pivot of the cable should always be horizontal.
Process conditions
Process temperature PVC version: 5 ... 70 °C (278 ... 343 K)
PUR version: 5 ... 70 °C (278 ... 343 K)
CSM/CM version: -20 ... 90 °C (253 ... 363 K)
Process pressure (static pressure) sleeve design: ≤ 3 bar at 20 °C (293 K)
ball design: ≤ 2 bar at 20 °C (293 K)
Density sleeve design: ≥ 0.8 g/cm3
ball design: ≥ 0.6 g/cm3
Mechanical specifications
Protection degree IP68
Mechanical construction
Versions sleeve design: LFL2-CK-U-PVC3, LFL2-CK-U-PUR3, LFL2-CK-U-CSM3
ball design: LFL2-BK-U-PVC3, LFL2-BK-U-PUR3, LFL2-BK-U-CSM3
Material float: PP (Polypropylene)
cable:
- PVC version: PVC cable, highly flexible (3 x 0.75 mm2)
- PUR version: PUR cable, highly flexible (3 x 0.50 mm2)
- CSM/CM version: CSM/CM cable (chlorinated polyethylene, (3 x 0.75 mm2))
Switching point switch angle: upper switching point +25° (± 10°), lower switching point -14° (± 6°), measured against the
horizontal
General information
Directive conformity
Directive 73/23/EEC
(Low Voltage Directive)
EN 50178
Directive 89/336/EC (EMC) EN 60947-5-2, EN 60947-5-2 A1
Conformity
Protection degree EN 60529
Supplementary information Statement of Conformity, Declaration of Conformity and instructions have to be observed. For information see
www.pepperl-fuchs.com.
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com
3
Release date 2007-07-12 13:51 Date of issue 2007-07-12 T3018_ENG.xml
Float switch
LFL2-**-U
Technical data
• LFL-Z231, counter nut, G1A, PVC
• LFL-Z32, counter weight, grey cast iron with plastic coating (Polycarbonate)
• LFL-Z33, counter weight, grey cast iron with ECTFE coating (Halar)
• LFL-Z131, cable gland G1A, PVC
• LFL-Z132, cable gland G1A, brass
• LFL-Z161, cable gland G2A, PVC
• LFL-Z431, cable gland 1 NPT, PVC
• LFL-Z432, cable gland 1 NPT, brass
• LFL-Z461, cable gland 2 NPT, PVC
Accessories
Type code/model number
LFL2– K–U –
Cable length
33 m (10 ft)
55 m (16.5 ft)
10 10 m (33 ft)
Cable material
PVC PVC cable
PUR PUR cable
CSM CSM cable
Electrical output
Uchange-over contact 250 V AC, 150 V DC
Float material
Kplastic PP
Float form
Csleeve
Bball
Switching element
2microswitch with switching ball
