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Point level detection
with Capacitive level switches

In addition to the capacitive level switch series Capanivo®, there is another type of sensor, the RF level detector RFnivo®, which is also based on the operating principle of a capacitor. The two types therefore do not differ in the way the limit level is determined, but rather in their mechanical design. As a result, they also cover different areas of application.

RF level detectors measure the capacitance between their probe (active electrode) and a reference electrode, which can be a metallic container wall, for example. If the probe is covered with material, this leads to a change in capacitance, which is detected by the electronics and output as a switching signal (relay or transistor). The dimensions of the capacitor can be variably changed over the probe length, which leads to an increase in sensitivity. Because of this variability, RF sensors must be calibrated after installation.

Capacitive level detectors do not require a metallic vessel wall for measurement. The two conductive electrodes required for a reliable measurement result are completely integrated into the probe. This simplifies commissioning, as no calibration is required after installation. 

FAQs

 

What are the advantages of capacitive measurement technology?

- Suitable for narrow openings and complex containers
- For high temperatures, high pressure and aggressive chemicals
- Interface measurement
- For liquids, bulk solids and slurries

 

What needs to be considered with capacitive measurement technology?

- Can be sensitive to caking
- Possible wear on plastic cantilevers
- Tank shape and turbulence
- Variable dielectric constant

 

Which devices are useful for CIP and SIP?

A capacitive point level switch for liquids is suitable for these processes. These sensors are sealed so that no liquid can enter. These devices are available with FDA certification and cantilevers made of PVDF and PPS.

 

FAQ – CAPACITIVE LEVEL MEASUREMENT

› When is a capacitive sensor the right solution for point level detection?

A capacitive sensor is suitable for reliable point level detection in bulk solids and liquids. Depending on the application, it can be used for full, empty or demand detection in silos, tanks and process vessels. Capacitive measuring technology offers versatile application possibilities and reliable point level detection across a wide range of media.

› When should a Capanivo® or an RFnivo® point level sensor be used?

The Capanivo® is suitable for a wide range of standard applications involving bulk solids and liquids and, thanks to its integrated sensor geometry, enables easy commissioning without calibration. The RFnivo® is primarily used in demanding applications where flexible probe adaptation or challenging process conditions place higher demands on the measuring technology.

› How do capacitive sensors respond to material build-up or foam?

Capacitive sensors detect changes in the electrical capacitance of a medium. Depending on the sensor type and technology, material build-up or foam can influence the measurement result. Special versions, for example those equipped with Active Shield technology, compensate for material deposits and ensure reliable point level detection even under demanding process conditions.

› How do I find the right capacitive sensor for my application?

Selecting the right capacitive sensor depends on the medium, the installation conditions and the process requirements. With the Capanivo® and RFnivo® product families, UWT offers solutions for capacitive level measurement across a wide range of bulk solids and liquid applications as well as demanding industrial processes.

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