Description

TDR Guided Wave Radar: Reliable Level Detection for Challenging Liquids TDR (Time Domain Reflectometry) sensors represent the pinnacle of contact-based level measurement. By guiding electromagnetic pulses along a probe directly into the medium, these sensors overcome the limitations of traditional ultrasonic or pressure-based systems. This “Time-of-Flight” principle ensures that the measurement is based purely on physical distance, providing a robust solution for a vast range of industrial fluids.

Key Features & Technical Advantages:

• Time Domain Reflectometry (TDR): Operates by sending a low-energy electromagnetic pulse down a probe. When the pulse hits the liquid surface (a change in dielectric constant), it reflects back, and the “time difference” is converted into a precise level reading.

• Independent of Media Properties: Because it measures the time-of-flight, the signal is virtually unaffected by changes in density, conductivity, temperature, or pressure.

• High Reliability in Foam and Steam: Unlike non-contact radar or ultrasonic sensors, the guided signal of a TDR probe can penetrate foam and is not disrupted by heavy steam or dust in the tank headspace.

• No Moving Parts: The solid-state design eliminates the maintenance issues associated with mechanical floats or flappers, ensuring a long service life in demanding environments.

• Precise Interface Measurement: Advanced TDR electronics can detect the reflection from two different liquids (e.g., oil over water), allowing for accurate interface level monitoring.

• Flexible Probe Options: Available with rod, wire rope, or coaxial probes to accommodate different tank heights and internal obstructions.

Typical Applications: TDR level sensors are the preferred choice for oil and gas storage, chemical processing tanks, pharmaceutical mixing vessels, and water treatment facilities. They are particularly effective in small tanks with turbulent surfaces or complex internal geometries where traditional measurement methods fail.