- Automation & ControlView all 2,120 products
- AC Drives
- Automation Accessories
- PLC & I/O Cards
- Industrial Communications
- Vibration Monitoring
- Controllers & Data Acquisition
- Isolator & Barrier
- CCTV & Security
- Safety Switches & Guard Locking
- Encoders
- HMI Displays
- Pneumatic Cylinders
- Motor Soft Starters
- Industrial Computers
- Servo Drives
- Machine Vision
- Automation Software
- Robotics
Brand: Pepperl+Fuchs
Pepperl+Fuchs LFL2-BK-U-PUR5-EMS Float Switch, 5 m Cable
Description
LFL2-BK-U-PUR5-EMS ball-type float switch with 5 m PUR cable
The LFL2-BK-U-PUR5-EMS is a float switch from the Pepperl+Fuchs LFL2 series. A mercury-free microswitch with a change-over contact is built into a polypropylene float; a metal ball inside the float rolls along an axis and operates the switch when the float tilts from the horizontal. It is used for limit detection in liquids such as water, wastewater and fuel tanks.
Part number reading: LFL2 is the float switch series, BK the ball design in black, U the microswitch element with change-over contact, PUR5 a 5 m polyurethane cable and EMS the version listed by the manufacturer for this build. The related LFL2-CK-U-PUR5-EMS uses a different float shape, and the PUR10 and PUR15 codes give 10 m and 15 m cables.
Seven Star LLC supplies this module in Oman and the GCC as an independent supplier in Muscat.
Technical specifications of the LFL2-BK-U-PUR5-EMS
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Pepperl+Fuchs LFL2-BK-U-PUR5-EMS |
| Construction | Ball design, high buoyancy; float material PP (polypropylene) |
| Switch element | Microswitch, mercury-free, change-over contact |
| Contact rating | 250 V AC / 3 A; 150 V DC / 0.25 A and 60 V DC / 1 A resistive |
| Insulation | Rated insulation voltage 300 V; pulse withstand voltage 4 kV; electrical life ≥ 5 x 104 cycles |
| Switching angles | Upper switch point 25° ± 10°; lower switch point 6° ± 6° against the horizontal |
| Cable | PUR, highly flexible, 3 x 0.50 mm², length 5 m |
| Process | Static pressure ≤ 2 bar at 20 °C; fluid density ≥ 0.6 g/cm³ |
| Ambient temperature | 5 to 70 °C; storage -25 to 70 °C; altitude ≤ 2000 m |
| Protection | IP68 |
| Mounting | Hung from the top by a counterweight or rods; cable pivot horizontal; keep at least 100 mm between mounting point and float, preferably for fuels, heating oils and oily fluids |
| Approval | CCC listed in the datasheet; low voltage directive 2014/35/EU |
How the LFL2-BK-U-PUR5-EMS switches
The float floats on the liquid. When the liquid level rises, the float tilts and the ball rolls to the other end of its axis, operating the microswitch; when the level falls the ball rolls back. Because the switching points are defined by angles, the actual level at which the contact changes depends on the cable length and the mounting position.
The change-over contact has three wires, so it can be wired for minimum or maximum fail-safe operation, either to start a pump at a high level or to stop it at a low level, and for a simple level message.
System fit and related parts
The LFL2-BK-U-PUR5-EMS is a mechanical switch for simple level control. For conductive electrodes use a switch amplifier like KFA6-ER-1.W.LB. For bulk solids the capacitive LCL1 is the suitable limit switch from the same maker. Where continuous level is needed, use an ultrasonic sensor such as UB2000-F42-U-V15 or UC1000-18GS-IUEP-IO-V15 instead.
Selection and ordering checklist for the LFL2-BK-U-PUR5-EMS
- Cable length: 5 m, 10 m or 15 m versions exist.
- Liquid density at least 0.6 g/cm³ and static pressure up to 2 bar.
- Float material PP versus the chemical in the tank.
- Contact rating against the pump or relay load.
- Mounting by counterweight or rods.
- Temperature from 5 to 70 °C.
Installation, commissioning and maintenance of the LFL2-BK-U-PUR5-EMS
Hang the switch so the cable pivot is horizontal and the float can swing freely, away from inlet streams and tank walls. Set the cable length so the two switching angles occur at the desired levels, and test by raising and lowering the liquid.
Inspect the float for deposits and the cable for abrasion at periodic tank cleaning. Never lift the switch by its cable alone without checking for load.
Wire the change-over contact so the failure state is safe: if the cable is cut or the float jams, the pump logic should stop the pump or raise an alarm. Add a second float at a high-high level for overflow protection, because a single float switch is a single point of failure.
Level setting with the LFL2-BK-U-PUR5-EMS
The vertical distance between the on and off point depends on the free cable length between the fixing point and the float, since the float swings on the cable like a pendulum. Longer free cable gives a larger switching distance, and shortening it narrows the differential. Fix the cable with a clamp or counterweight so that this length stays constant.
For oily fluids and fuels keep the 100 mm minimum distance from the mounting point, so that the float can tilt freely and not stick.
Typical applications in Oman and the GCC
In Oman and the GCC the LFL2-BK-U-PUR5-EMS is used for sumps, drain pits, cooling water basins and settling tanks, where a low-cost level contact to start or stop a pump is enough and the liquid is not aggressive to polypropylene.
Family comparison
| Part | Key difference |
|---|---|
| LFL2-BK-U-PUR5-EMS (this part) | Ball float, PUR cable 5 m |
| LFL2-BK-U-PUR10-EMS | Same float, 10 m cable |
| LFL2-BK-U-PUR15-EMS | Same float, 15 m cable |
| LFL2-CK-U-PUR5-EMS | Related LFL2 float with different float design |
Information to send with an RFQ
- Part number LFL2-BK-U-PUR5-EMS and quantity
- Liquid, density and temperature
- Cable length
- Load on the contact
- Delivery location
Documents and quotation
The manufacturer datasheet for LFL2-BK-U-PUR5-EMS is attached on this page, so you can check wiring, approvals and dimensions before ordering. Send the exact part number, quantity and delivery location in Oman or the GCC and Seven Star LLC will reply with a quotation.
Seven Star LLC is an independent supplier in Muscat and is not the manufacturer; confirm availability, lead time and any project approval requirements in your RFQ.
Datasheets & Documents
- Datasheet Pepperl+Fuchs LFL2-BK-U-PUR5-EMS Datasheet Download
Reviews (0)
About brand
Pepperl+Fuchs is a German manufacturer of industrial sensors and explosion protection equipment, founded in 1945 in Mannheim by Walter Pepperl and Ludwig Fuchs as a radio repair shop. Defective transformers led them into manufacturing, and the company developed its first proximity switch in the late 1950s. Pepperl+Fuchs is headquartered in Mannheim and is a pioneer of intrinsically safe electrical equipment for hazardous areas.
Seven Star LLC lists Pepperl+Fuchs sensors, isolated barriers, power supplies and hazardous-area mobile devices, and supplies them to instrument and automation teams in Oman by exact model designation.
Pepperl+Fuchs company profile
| Founded | 1945, Mannheim-Sandhofen, Germany, by Walter Pepperl and Ludwig Fuchs |
|---|---|
| Headquarters | Mannheim, Germany |
| Ownership | Privately owned (Pepperl+Fuchs SE) |
| Origins | Radio repair workshop that began making replacement transformers |
| Product families | Inductive, capacitive, ultrasonic and photoelectric sensors, rotary encoders, R2000 LiDAR scanners, KFD and HiC isolated barriers, Zener barriers, remote I/O, purge and pressurization systems, Ex-rated enclosures |
Milestones
- 1945: Walter Pepperl and Ludwig Fuchs open their radio repair shop in Mannheim.
- 1958: The first proximity switch is developed (some company sources say 1959).
Pepperl+Fuchs product families on this page
On the interface side there are two systems. The K-System mounts on DIN rail and is represented here by the KFD2-UT2-Ex2 universal temperature converter. The H-System plugs into termination boards and is represented by the HiD2030 SMART transmitter power supply with HART. The PS1000-A6-24.20 is a 24 VDC, 20 A power supply for cabinets. Sensors listed include the NJ2-12GK-SN NAMUR inductive sensor, the R101 retro-reflective photoelectric sensor and the R2000 2-D LiDAR scanner. For field staff there are the Tab-Ex 05 DZ1 tablet for Zone 1/21 areas and the Smart-Ex 03 DZ2 smartphone for Zone 2/22 and Division 2 areas.
Where Pepperl+Fuchs equipment is used
Isolated barriers sit between field instruments in Zone 0 or Zone 1 and the DCS or safety system in refineries, gas plants and chemical works. NAMUR sensors report valve position and machine states in classified areas. Photoelectric sensors and LiDAR scanners work in conveying, packaging, warehousing and vehicle guidance. Ex-rated tablets and phones are carried on operator rounds and maintenance jobs.
Pepperl+Fuchs products we list
Ordering Pepperl+Fuchs parts: what we need
Send the complete model designation as printed on the device, including every suffix; a single letter can change the supply voltage or the output type. Add the part number if the label shows one. For barriers, tell us the field device and signal type, the number of channels and whether the safety loop needs a SIL-assessed module. For mobile devices, state the zone or division and the regional radio version.
Facts checked against Pepperl+Fuchs's own chronicle pages, October 2026.
Browse Pepperl+Fuchs products by category: Sensors & Transmitters, Industrial Computer, Isolator & Barrier, Power Modules.
FAQ
Questions about the Pepperl+Fuchs LFL2-BK-U-PUR5-EMS Float Switch, 5 m
Answers from our engineering team on installation, compatibility and integration.
01What type of switch is inside the LFL2-BK-U-PUR5-EMS?
A mercury-free microswitch with a change-over contact, operated by a metal ball inside a polypropylene float.
02What are the switching angles?
The upper switch point is 25 degrees plus or minus 10 and the lower is 6 degrees plus or minus 6 against the horizontal.
03What contact rating is stated?
250 V AC at 3 A, 150 V DC at 0.25 A resistive or 60 V DC at 1 A resistive.
04What are the process limits?
Static pressure up to 2 bar at 20 °C, density at least 0.6 g/cm³ and ambient 5 to 70 °C.
05What is the protection class?
IP68 with a 5 m PUR cable of 3 x 0.50 mm².
Reviews
There are no reviews yet.