Key Specifications

 

• Manufacturer: SICK AG
• Model Series: LFP Cubic
• Sensing Principle: Guided Wave Radar (Time-Domain Reflectometry – TDR)
• Application: Continuous level measurement and point level switching for fluids.
• Process Connection: Hygienic fitting (appears to be a Tri-Clamp)
• Operating Voltage: 12 to 30 V DC
• Outputs: This is a highly versatile sensor with multiple configurable outputs:
  • Analog Output (Qa): Can be set to 4-20 mA or 0-10 V.
  • Switching Outputs (Q₁, Q₂): Two transistor outputs (Iout​≤100 mA) for point level alarms (e.g., high/low level).
  • Communication: IO-Link for advanced configuration, diagnostics, and process data.
• Enclosure Rating: IP67
• Power Consumption: Pmax​≤0.5 W

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## Wiring & Pinout

 

The label on the sensor shows the standard 5-pin M12 connector wiring:

• Pin 1 (brn – Brown): L+ (Power Supply, 12-30 V DC)
• Pin 2 (wht – White): Qa (Analog Output)
• Pin 3 (blu – Blue): M (Ground / 0V)
• Pin 4 (blk – Black): C/Q₁ (IO-Link Communication / Switching Output 1)
• Pin 5 (gra – Grey): Q₂ (Switching Output 2)

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## Functionality

 

This sensor operates by sending a low-energy microwave pulse down a probe (rod or cable, not visible in the picture) that extends into the tank. When the pulse hits the surface of the liquid, it is reflected back to the sensor. The sensor measures the time it takes for the pulse to travel down and back, and from this, it calculates the exact level of the fluid

data sheet

SICK WT27L-2F430 Laser Photoelectric Sensor

SICK WTT12LC-B2543 Laser Photoelectric Sensor