Select Your Country
LKL-P1 Conductive Limit Switch
Key Benefits at a Glance
- Limit switch for conductive liquids
- Device with rod probe
- Detect up to five level limits with one probe
- Flexible instrumentation
- No moving parts in the tank
- No calibration: quick and low-cost start up
- Two-point control and additional maximum and minimum detection
- Approval as overfill protection and leak detection system acc. to WHG
Show more
Note
All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.
EN
- DE
- EN
Technical data of LKL-P1
| Type | sensor for conductive limit value detection | |
| Measuring method | An alternating voltage exists between the probes in an empty tank. As soon as the conductive liquid in the tank creates a connection between the ground probe and, for example, the maximum probe, a measurable current flows and the device switches. With level limit detection, the device switches back as soon as the liquid clears the maximum probe. With two-point control, the device does not switch back until the max and min probe is cleared. Using alternating voltage prevents corrosion of the probes and electrolytic destruction of the product. The material used for the tank walls is not important for measurement because the system is designed as a closed potential-free circuit between the probes and the electronics. There is absolutely no danger if the probes are touched during operation. | |
| Construction type | device with rod probe | |
| Operating mode | Selecting the correct fail-safe mode ensures that the relay/the output always runs in quiescent current fail-safe. output E5 (FEW52): - maximum fail-safe: The output signal is < 1 mA if the switch point is exceeded (probe covered), a fault occurs or the power supply fails. - minimum fail-safe: The output signal is < 1 mA if the switch point is undershot (probe uncovered), a fault occurs or the power supply fails. Output WA (FEW54): - maximum fail-safe: The relay de-energises when the switch point is exceeded (probe covered), a fault occurs or the power supply fails. - minimum fail-safe: The relay de-energizes when the switch point is undershot (probe uncovered), a fault occurs or the power supply fails. output N1 (FEW58): - maximum fail-safe: The output voltage is 0 V if the switch point is exceeded (probe covered), a fault occurs or the power supply fails. - minimum fail-safe: The output voltage is 0 V if the switch point is undershot (probe uncovered), a fault occurs or the power supply fails. | |
| Series | LKL-P1 | |
| Versions | probe with integrated electronic insert (compact instrument version) probe without integrated electronic insert (separate instrument version) for one, two or multiple point detection respectively, see section measuring system |
| Connection | see section electrical connection | |
| Rated voltage | Ur | Output E5 (FEW52): supply voltage 10.8 ... 45 V DC load connection: open collector; PNP switching voltage: max. 45 V output WA (FEW54): supply voltage 20 ... 55 V DC or 20 ... 253 V AC, 50/60 Hz peak inrush current: max. 2 A, max. 400 µs output: two potential-free change-over contacts output N1 (FEW58): refer to datasheet of the connected switch amplifier acc. to IEC 60947-5-6 (NAMUR) |
| Current consumption | Output E5 (FEW52): I < 25 mA (without load) output WA (FEW54): 60 mA | |
| Power consumption | Output E5 (FEW52): P < 1.1 W output WA (FEW54): P < 2.0 W | |
| Reverse polarity protection | output E5 (FEW52) | |
| Contact loading | output WA (FEW54): 253 V AC/4 A, 30 V DC/4 A, 150 V/ 0.2 A |
| Connection | see section electrical connection | |
| Input signal | probes covered - A measurable current is flowing between the probes. probes uncovered - There is no measurable current flowing between the probes. | |
| Measured variable | resistance change between two conductors caused by the presence or absence of a conductive product. | |
| Measuring range | The measuring range depends on the mounting location of the device 250 ... 4000 mm |
| Connection | see section electrical connection | |
| Switching delay | A switching delay of 2.0 s can be activated or deactivated via a DIL switch. If the switching delay is set to 0 s, the device switches after approx. 0.3 s. | |
| Load | Output E5 (FEW52): The load is switched via a transistor (PNP), cycled overload and short-circuit protection, continuous ≤ 200 mA (short-circuit proof), residual voltage at transistor at Imax 2.9 V Output WA (FEW54): Loads are switched via 2 potential-free change-over contacts. I~ max. 4 A, U~ max. 253 V P~ max. 1000 VA, cos φ = 1, P~ max. 700 VA, cos φ > 0.7 I- max. 4 A to 30 V, I- max. 0.2 A to 150 V When connecting a functional extra-low voltage circuit with double insulation in accordance with IEC 1010: The sum of the relay output and power supply voltages is max. 300 V. output N1 (FEW58): refer to datasheet of the connected switch amplifier acc. to IEC 60947-5-6 (NAMUR) | |
| Measuring range | A total of four measuring ranges (100 Ω, 1 kΩ, 10 kΩ, 100 kΩ) can be set via two DIL switches (SENS). The setting on delivery is 100 kΩ. | |
| Output signal | see section electrical connection | |
| Signal on alarm | Output E5 (FEW52): in the event of a power failure or a damaged probe: < 100 µA. output WA (FEW54): output signal in the event of a power failure or a damaged probe: relay de-energised. output N1 (FEW58): output signal with damaged sensor < 1 mA |
| Input/Other circuits | output WA (FEW54): All input channels, output channels and relay contacts are galvanically isolated from each other. |
| Electromagnetic compatibility | |||||
| |||||
| Low voltage | |||||
| |||||
| Electromagnetic compatibility | NE 21 | |
| Degree of protection | IEC 60529:2001 | |
| Vibration resistance | EN 60068-2-64 | |
| Climate class | DIN EN 60068-2-38/IEC 68-2-38 |
| Reference operating conditions | ambient temperature: 23 °C (296 K), medium temperature: 23 °C (296 K), medium viscosity: medium must release the probe again (drain off), medium pressure pe: 0 bar, probe installation: vertically from above | |
| Maximum measured error | ± 10 % at 0.1 ... 100 kΩ ± 5 % at 1 ... 10 kΩ | |
| Non-repeatability | ± 5 % at 0.1 ... 100 kΩ ± 1 % at 1 ... 10 kΩ | |
| Hysteresis | -10 % for the max probe, in reference to the switch point, Δs function deactivated | |
| Influence of ambient temperature | < 0.05 %/K | |
| Switching time | < 3 s |
| Installation conditions | |||||||||||
| |||||||||||
| Process conditions | |||||||||||
| |||||||||||
| Ambient temperature | -40 ... 70 °C (-40 ... 158 °F) -40 ... 60 °C (233 ... 333 K) for output N1 (FEW58) | |
| Storage temperature | -40 ... 80 °C (-40 ... 176 °F) | |
| Climatic conditions | tropicalized | |
| Vibration resistance | 20 ... 2000 Hz, 1 (m/s2)2/Hz | |
| Impact resistance | practical test |
| Degree of protection | IP66 | |
| Connection | cable connection M20x1.5, 1/2NPT, G1/2 | |
| Material | rod probes: 1.4404/316L, insulation: PP housing: - output NA (separate instrument version): housing PPS, cover PBT - output E5/WA/N1 (compact instrument version): housing PBT, cover PBT, adapter PBT process connections: PPS | |
| Mass | separate instrument version: with probe length 1 m (3 ft), with 2, 3 or 5 rods: 415 g, 530 g, 760 g compact instrument version: with probe length 1 m (3 foot), with 2 or 3 rods: 600 g, 720 g | |
| Dimensions | housing: max. Ø85 mm (3.3 inch), height max. 145 mm (5.7 inch) rod probes: compact instrument version 2 or 3 rods, separate instrument version 2, 3 or 5 rods - diameter without insulation: Ø4 mm (0.16 inch) - rod length: 100 ... 4000 mm (4 in ... 13 ft) - thickness of insulation: 0.5 mm (0.02 inch) - length of non-insulated area (tip of rod): 20 mm (0.8 inch) - extraction forces: 1000 N | |
| Process connection | - thread G1-1/2 acc. to DIN/ISO 228/1 - thread NPT1-1/2 acc. to ANSI B 1.20.1 |
| EU-type examination certificate | TÜV 03 ATEX 2295 | ||||
| |||||
| Certificate | Pepperl+Fuchs | ||||
| |||||
| Directive conformity | |||||
| |||||
II 2G Ex ia/ib IIB/IIC T6...T5 Gb| Display elements | separate instrument version: dependent on the connected switching unit compact instrument version: output E5 (FEW52), WA (FEW54): - one red light emitting diode: fault message, switching status - one green light emitting diode: operation output N1 (FEW58): - one yellow light emitting diode: fault message, switching status - one green light emitting diode: operation | |
| Control elements | - one DIL switch for min/max position - one DIL switch for 0 s or 2 s switching delay - two DIL switches for setting the measuring ranges 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ |
| Overspill protection | Z-65.13-378 (overspill protection acc. to WHG) Z-65.40-379 (leak detection system acc. to WHG) see approval (ZE) |
| Supplementary documentation | technical information (TI) brief instructions (KA) approval (ZE) | |
| Supplementary information | Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see www.pepperl-fuchs.com. |
| Designation | - LKL-Z10 lock nut G1-1/2, AF60 - LZ-1204 mounting bracket G1-1/2 - electronic insert E5 (FEW52), output PNP 10.8 V DC ... 45 V DC - electronic insert WA (FEW54), output relay 20 V AC ... 253 V AC, 20 V DC ... 55 V DC - electronic insert N1 (FEW58), output NAMUR (IEC 60947-5-6) |
