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DCL 551 Stainless Steel Probe RS485 Modbus RTU

Introducing the DCL 551 Stainless Steel Level Probe, designed for precise hydrostatic level measurement in tough environments like sewage and viscous media. Featuring a robust capacitive ceramic sensor, it performs reliably under high pressure. This probe integrates smoothly with Modbus RTU via RS485, allowing efficient binary data exchange between multiple devices. Ideal for accurate, efficient, and reliable level measurement in a variety of applications.

DCL 551 Stainless Steel Level Probe Product Parameters

  • Pressure Ranges: Gauge [bar]: 0.04 to 20, Level [mH2O]: 0.4 to 200.
  • Output Signal: RS485 with Modbus RTU for pressure and temperature.
  • Accuracy: Standard ≤ ± 0.35% FSO; Optional ≤ ± 0.25% FSO.
  • Electrical Connections: Direct current, VS = 9 – 32 VDC.
  • Process Connections: Max. ambient pressure 40 bar.
  • Media Compatibility: Resistant to various media; verify for specific applications.
  • Special Features: Integrated ventilation tube, adjustable units for pressure, IP 68 ingress protection.

Product Highlights

The DCL551 Pressure Transmitter is a versatile and reliable device designed for accurate pressure measurement across a wide range of applications. With a nominal pressure range of 0 … 40 cmH2O up to 0 … 200 mH2O, it offers precise readings for various pressure levels. The transmitter utilises an RS485 output signal with Modbus RTU protocol, enabling seamless integration with different systems. One of its standout features is its compact diameter of 39.5 mm, making it easy to install in tight spaces. Additionally, the DCL551 exhibits excellent long-term stability, ensuring consistent and reliable performance over extended periods. This transmitter is specifically well-suited for challenging environments like sewage systems, as well as for measuring viscous and pasty media. Moreover, it offers a convenient reset function, simplifying calibration and adjustments. For added customisation, an optional version with a diaphragm made of ceramics Al2O3 99.9% is available, catering to specific requirements. The DCL551 Pressure Transmitter combines precision, durability, and adaptability to deliver accurate measurements in a wide range of applications.


  • Sewage
    • Wastewater treatment
    • Water recycling
  • Fuel and Oil
    • Level monitoring in open tanks with low filling heights
    • Fuel storage
    • Tank farms/ biogas plants

To download the latest datasheet click here: DCL 551

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