Serviceline Industrial Sensors
Serviceline Explosion Protection

Conductive Level Limit Switch LKL-P*

LKL-P*
  • Level limit switch for conductive liquids
  • 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
  • Option between rod or rope version for optimum adaptation to the application
  • Two-point control and additional maximum and minimum detection
  • Approval as overfill protection and leak detection system acc. to WHG

Please 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, also apply to Pepperl+Fuchs AG.

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Directive conformity
Electromagnetic compatibility
Directive 2014/30/EUEN 61326-1:2006 , EN 61326-2-3:2006
Low voltage
Directive 2014/35/EUEN 61010-1:2001
Conformity
Electromagnetic compatibilityNE 21
Degree of protectionIEC 60529:2001
Vibration resistanceEN 60068-2-64
Climate classEN 60068, part 2-38 (test Z/AD)
Function and system design
Measuring principleAn 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.
Equipment architectureprobe 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
Input characteristics
Measured variableresistance change between two conductors caused by the presence or absence of a conductive product.
Measurement rangeThe measuring range is dependent on the mounting location of the probes.
Rod probes can have a max. length of 4000 mm (13 ft) and rope probes up to 15000 mm (49 ft).
Input signalprobes covered - A measurable current is flowing between the probes.
probes uncovered - There is no measurable current flowing between the probes.
Output characteristics
Output signalsee section electrical connection
Measurement rangeA 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.
Signal on alarmOutput 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.
Fail-safe modeSelecting 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.
LoadOutput 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)
Switching delayA 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.
Galvanic isolationoutput WA (FEW54): All input channels, output channels and relay contacts are galvanically isolated from each other.
Lead monitoringFor probes without an electronic insert, an additional printed circuit board must be installed in the housing, which enables cable monitoring. It is always switched or connected between rod/rope 1 and 2.
Note!
When using switching units (transmitters) that do not support cable monitoring, these must be removed.
Auxiliary energy
Electrical connectionsee section electrical connection
Supply voltageOutput 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)
Power consumptionOutput E5 (FEW52): P < 1.1 W
output WA (FEW54): P < 2.0 W
Current consumptionOutput E5 (FEW52): I < 25 mA (without load)
output WA (FEW54): 60 mA
Reverse polarity protectionoutput E5 (FEW52)
Contact loadingoutput WA (FEW54): 253 V AC/4 A, 30 V DC/4 A, 150 V/ 0.2 A
Signal on alarmoutput N1 (FEW58): output signal with damaged sensor < 1 mA
Measurement accuracy
Reference operating conditionsambient 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
Operating conditions
Installation conditions
Mounting locationThe rod and rope probes are mounted predominantly in tanks made of plastic or metal.
Mounting examplessee section example applications
Ambient 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)
Climate classtropicalized
Shock resistancepractical test
Vibration resistance20 ... 2000 Hz, 1 (m/s2)2/Hz
Process conditions
Medium temperature-40 ... 100 °C (-40 ... 212 °F)
Medium pressure-1 ... 10 bar (-14.5 ... 145 psi)
Conductivity≥ 10 µS
Mechanical specifications
Degree of protectionIP66
Data for application in connection with hazardous areas
EU-Type Examination CertificateTÜV 03 ATEX 2295
MarkingEx-Hexagon II 2G Ex ia/ib IIC T4
Directive conformity
Directive 2014/34/EUEN 60079-0:2009 , EN 60079-11:2007
Mechanical construction
Construction typeLKL-P1: rod version
LKL-P2: rope version
DimensionsLKL-P1:
- housing: max. Ø85 mm (3.3 inch), height max. 145 mm (5.7 inch)
- rod: length 100 ... 4000 mm (4 in ... 13 ft)
LKL-P2:
- housing: max. Ø85 mm (3.3 inch), height max. 145 mm (5.7 inch)
- rope: length 250 ... 15000 mm (10 in ... 49 ft)
Massseparate instrument version:
- rod, 1 m (3 ft) long, LKL-P1 with 2, 3 or 5 rods: 415 g, 530 g, 760 g
- rope, 1 m (3 ft) long, LKL-P2 with 2, 3 or 5 ropes: 390 g, 470 g, 640 g
compact instrument version:
- rod, 1 m (3 ft) long, LKL-P1 with 2 or 3 rods (600 g/720 g)
- rope, 1 m (3 ft) long, LKL-P2 with 2 or 3 ropes (710 g/800 g)
Materialprobes:
- rods: rod 1.4404/316L, insulation: PP
- ropes: rope 1.4571/316Ti, insulation FEP, weight 1.4435/316L
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
Process connection- cylindrical thread G1½A to DIN ISO 228/1
- conical thread 1½ NPT to ANSI B 1.20.1
Proberod 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 rope probes: compact instrument version 2 or 3 ropes, separate instrument version 2, 3 or 5 ropes
- diameter without insulation: Ø1 mm (0.04 inch)
- rope length: 250 ... 15000 mm (10 inch ... 49 ft)
- thickness of insulation: 0.75 mm (0.03 inch)
- weight length: 100 mm (4 inch) (not insulated)
- weight diameter: Ø10 mm (0.4 inch)
- extraction forces: 500 N
Electrical connectioncable connection M20x1.5, 1/2NPT, G1/2
Indication and operation
Display elementsseparate 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
Certificates and approvals
Overspill protectionsee approval (ZE)
General information
Supplementary documentationtechnical information TI375O
operating instructions KA203O (LKL-P* without electronic insert)
operating instructions KA204O (LKL-P* with integrated electronic insert)
safety information SI230O (TÜV 03 ATEX 2295)
safety information SI226O (Ex-Hexagon II 3G EEx nA [L] IIC T6 or nC [L])
approval ZE043O overspill protection acc. to WHG (Z-65.13-378)
approval ZE257O leak detection system (Z-65.40-379)
Supplementary informationEC-Type Examination Certificate, Statement of Conformity, Declaration of Conformity, Attestation of Conformity and instructions have to be observed where applicable. For information see www.pepperl-fuchs.com.

Approvals+Certificates: LKL-P*

Statements of compliance证书号码文件类型文件大小
Declaration of Conformity for simple apparatus / Konformitätserklärung für einfache BetriebsmittelDOC-1837DPDF71 KB
EU-Declaration of conformity / EU-KonformitätserklärungDOC-2087CPDF105 KB
EU-Declaration of conformity / EU-KonformitätserklärungDOC-2086CPDF73 KB
Certificates
Europe DIBT WHG Leak DetectionZ-65.40-379PDF536 KB
Europe DIBT WHG Overspill ProtectionZ-65.13-378PDF543 KB
Europe TUV Nord ATEX Category 2 GTÜV 03 ATEX 2295PDF350 KB