Sick Test & Measurement

The LFP Cubic: level measurement with guided microwave

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By adding new functions to the LFP cubic level sensor, SICK enhances its level measurement product range and offers extremely high measuring accuracy even in difficult applications. Thanks to IO Link, the LFP Cubic opens up excellent possibilities for integration in the type of automation common in machine and plant engineering.

The LFP Cubic combines continuous level measurement with level detection in a single device. The level sensor, nearly wear- and maintenance-free, is used in metal containers and tanks in the water industry, in machine building, on machine tools, in plant engineering, and in building services engineering. It is available in a version with an analog output and two switching outputs as well as a version with an analog output plus four switching outputs.

Adjusts to the measuring task

The LFP Cubic is designed for a universal range of possible uses. The measuring principle of the “guided microwave” makes the level sensor independent of influences related to installation, the container, and the medium. As a result, the sensor is suited for nearly any water- and oil-based fluids, e.g. coolants, grinding and hydraulic oils or blends containing cleansing, degreasing, and cleaning agents. For very difficult applications, a coaxial tube is available; it minimizes interferences and makes it possible to use the LFP, for example, in oils with very low dielectric constants. Graduated probe lengths from 200 mm to 2000 mm are available, allowing an individual layout of the sensor. In addition, the stainless steel measuring probe is screwed together – i.e. it can be disassembled, shortened, or replaced. The LFP is also flexible with respect to process conditions: it is suitable for temperatures up to 100 °C (212 °F) and process pressures up to 10 bar (1,000 kPa). Sensor setting takes place using a display-supported, menu-guided operation that follows suggestions by the VDMA (German Engineering Federation). Alternatively, the two switching points as well as the analog-output measuring range can be parameterized by IO Link via the machine control, and it can also be monitored and changed from there.

Very precise – even in case of foam

The LFP Cubic ranks among the most accurate measuring systems of its kind – even in applications associated with foam. In contrast to many other sensor-based active principles, the measuring results are influenced only insignificantly by the properties of the medium measured, e.g. density or conductivity. In terms of operations, this means that the level sensor does not have to be re-configured when physical properties of the fluids change. Since at any given probe length the LFP cubic features only very small inactive areas, it offers a maximum detection range in any variant. Measuring accuracy is at +-5 mm – a value otherwise achieved only by considerably more expensive level measurement systems.

The LFP Cubic makes the advantage offered by the high-tech sensor principle of the guided microwave usable for standard applications in factory automation – and it does so at a superb price-performance ratio.


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