The PERLeVeL® capacitive measuring systems are suitable for limit value measurement of fill levels. The system consists of level probe & evaluation electronics. The probes are available with 1, 2, 3 or 4 fixed switching points depending on the probe length. The positions of the limit value switching points are freely definable within the possible range and are specified by the customer when ordering. This allows the probes to be optimally determined to suit the respective application. The fixed limit values are formed by the specified measuring ranges. The limit value signals are practically independent of changes in the dielectric constants (DK) of the products.

The customised probes are available in lengths from 100 mm to 2000 mm.

The evaluators with 4 switching points can be extended by using the master and slave principle. The models are the same. The coding of which unit is master and which is slave can be easily done by the user. Each slave unit allows the extension by 4 measuring points.

In addition, we offer compact probes with process connection head. The evaluation electronics are integrated in the connection head. As variants we have 1 or 2 fixed limit value switching points.

Advantages are:

– Level measurements in containers, pipes up to approx. 5 m diameter.
– For bulk solids εr ≥ 1,2
– Also suitable for inhomogeneous media due to large measuring volume detection
– With appropriate mounting almost independent of the cone of repose
– Probe can be used in the range from – 70 °C to + 250 °C (does not apply to KFX-…)
– Insensitive to electrostatics
– Suitable from εr = 1.1 – i.e. for extremely low bulk densities (e.g. polystyrene)
– Measurement influences due to deposits negligible
– Suitable for any container shape
– For fixed limit values independent of DK changes
– Multiple measurements without mutual interference
– Convenient adjustment (“blind” adjustment)