Level switches for solids
The operating principle is the same for all vibrating probe level switches. A piezoelectric crystal is used to force a blade to oscillate at its fundamental frequency (also called natural resonance). When the blades come into contact with the process media the natural frequency of oscillation is dampened; the electronics sense the change in frequency which causes the unit to switch.
The DP650 Series has a single solid stainless steel rod which is vibrated by the piezo electric element. Thanks to its small size, it is ideal for use in small hoppers containing granular materials or pellets, like plastics, food or grain, but the circular construction of the DP650 means that it is not as sensitive to light materials. DP650 probes should only be used on materials which have a bulk density greater than 90 grammes per litre.
No maintenance required
Very strong and robust
Unaffected by environmental changes
Simple to install
Measures products from 10grm/litre
Only sensitive near the probe tip