Serviceline Industrial Sensors
Serviceline Explosion Protection

Loop detector LC20-1-DR 12-24VAC/DC

LC20-1-DR 12-24VAC/DC
  • Sensor system for vehicle detection
  • Complete control interface for inductive loops laid beneath the surface
  • Reliable detection with long service life
  • Various operating modes available
  • Boost function for increasing sensitivity
  • Test function
  • Version with 1 loop channel

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 or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  LC20-1-DR 12-24VAC/DC

Product Description
Sensor system for detecting vehicles, one loop, DIN rail mounting, 24 VAC/DC
General specifications
Adjustment rangeSensitivity ΔL/L 4x adjustable on the front panel
0.01 % ... 0.1 % with ASB overwrite option
Function principleInductive loop
Presence timeOne hour for 3 % ΔL/L and option for permanent presence
Self-tuning range20 μH ... 1500 μH
Operating frequency4x adjustable on the front panel: 12 kHz ... 80 kHz (with AFS switched off)
Operating modePulsed and continuous signal
Indicators/operating means
Function indicator1 x red LED: Power supply/Status , 1 x green LED: Channel status
Control elementsDIP-switch , Refer to the documentation for functions
Switching stateLED
Electrical specifications
Operating voltage12 ... 24 V AC/DC ± 15%
No-load supply current∅ 35.26 mA
Power consumption∅ 0.56 VA
Number of channels1
Output typerelay
Signal outputTwo output relays
Relay 1: presence output
Relay 2: pulse output
Switching currentRelay 1 (presence output): 1 A at 230 V AC Changeover contacts (fail-safe) Relay 2 (pulse output) max. 1 A at 230 VAC changeover contacts (not fail-safe)
Pulse length150 ms or 250 ms (selected via switch)
Response time200 ms ... 300 ms
Directive conformity
Radio and telecommunication terminal equipment2014/53/EU
Approvals and certificates
FCC approvalFCC 47 CFR Part 15
Ambient conditions
Operating temperature-40 ... 70 °C (-40 ... 158 °F)
Storage temperature-40 ... 70 °C (-40 ... 158 °F)
Relative humiditymax. 90 % , non-condensing
Mechanical specifications
Degree of protectionIP30
Connection2 x 6 plug-in screw terminals ≤1.5 mm2
HousingABS, anthracite
InstallationDIN mounting rail
Mass250 g

Documents: LC20-1-DR 12-24VAC/DC

ManualsLanguageFile TypeFile Size
ManualENGPDF8974 KB
HandbuchGERPDF14384 KB
Short instructions, safety information
brief instructionsENGPDF628 KB
brief instructionsFRAPDF583 KB
KurzanleitungGERPDF648 KB
brief instructionsSPAPDF573 KB

CAD+CAE: LC20-1-DR 12-24VAC/DC

CADFile TypeFile Size
3-D model in IGS format / 3-D-Modell im IGS-FormatIGS15268 KB
3-D model in STP format / 3-D-Modell im STP-FormatSTP5373 KB

Approvals+Certificates: LC20-1-DR 12-24VAC/DC

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of Conformity / EU-KonformitätserklärungDOC-4403PDF227 KB

Associated Products: LC20-1-DR 12-24VAC/DC

Matching System Components
Compact, easy-to-operate Bluetooth device, Generation of a full installation report in case of site sign-off, Performance checks on loop and installation, Compatible with all LC20 loop detectors, Operating range of up to 17 mfa

Function: LC20-1-DR 12-24VAC/DC

In combination with wire loops laid in the floor, loop detectors form a universal sensor system for detecting vehicles. When vehicles drive onto the loop, the resonance frequency changes. Intelligent automatic frequency selection (AFS) reduces setup time and simplifies the installation of complex multi-lane entrances. The evaluation process automatically and cyclically adjusts to the respective loop, so that changes in loop inductance due to temperature, humidity or component ageing are automatically compensated.