Latest technology: TDR sensor with coaxial probe for continual fill level measurements with analogue and switching output, e.g., as alternative for capacitive sensors.
Measurement principle
The LFT uses the TDR technology (TDR = Time Domain Reflectometry) – a process for determining run times of electromagnetic waves. A low-energy, electromagnetic impulse is generated in the electronics of the sensor, coupled into the coaxial probe and run in the inside of this probe. When this impulse reaches the fluid on the surface to be measured, part of the impulse is reflected there and runs along the probe back to the electronics, which then calculates the fill level from the time difference between the impulse sent out and the received on. The sensor can output this as continual measurement value (analogue output) as well as derive a freely positionable switching point [S] from it (switching output).
Area of use
Innovative TDR technology enables inexpensive, reliable fill level measurements largely independent of applications. The LFT is suitable both for continual fill level measurements and for limit-level detection in almost all fluids; changes in the properties of fluids to be measured do not influence it. It is the solution for precise and reliable measurements, especially in small tanks and containers – independent of installation conditions. Typical applications are, for example, in:

• Coolant lubricants
• Oil
• Other fuel types