A capacitance level transmitter is an example of indirect level measurement. Most level sensors directly read the level of the product. This one reads an electrical charge, which changes according to the level of the product. For accurate results, you need to know the dielectric constant of your product and the empty and full level values of your tank.

You will find a variety of capacitance level sensors in our webshop.

How a capacitance level transmitter works

You can use this solution in a wide range of solids, liquids, and slurries. It works with a radio frequency signal (RF) applied in a capacitance circuit. Also, you can use it in products with either low or high dielectric constants, so it gives you lots of flexibility.

Capacitive level transmitter working principle
Courtesy of VEGA

Now for how it works. To complete the circuit, the capacitor needs two plates. The insulated electrode works as one plate, and the tank wall the other. If you have a nonmetallic tank, then you can use a reference electrode.

The transmitter sends an RF signal between the conductive probe and the tank wall, so it creates a low current through the dielectric product. When the level drops, the dielectric constant will decrease, causing a drop in current flow. This, in turn, creates a low reading. The transmitter will detect such changes and translate the data into level values, converting to an analog output, for example.

If you would like to know more about various types of level sensors and transmitters, take a look at our articles on non-contact level measurement and time-of-flight devices.

Other resources that might interest you

Level switch or vibrating fork applications
How can you ensure that your tank will not overflow if there’s a wave radar failure? 

Hybrid level measurement!
What type of application do you need for hybrid level measurement?

Pressure transmitter level calculation
What type of pressure transmitter do I need for level measurement? And how can I calculate the level range?

 

Recommended articles