Remote-Mounted Capacitive Level Switch — 100 Q&A

 Fundamental Principles 1–15

1. What is a capacitive level switch?

A capacitive level switch is a point-level detection device that detects changes in capacitance when a liquid or solid material reaches the sensing probe.

2. How does a capacitive level switch work?

The sensor detects changes in the electrical capacitance between the probe and the surrounding reference electrode or vessel wall when the material reaches the detection point.

3. What is a remote-mounted capacitive level switch?

It is a capacitive level switch with the sensing probe and electronic unit installed separately and connected by a cable.

4. Why use a split-type capacitive level switch?

The separated electronics allow the electronic unit to be installed away from high-temperature, corrosive, vibrating, or space-limited process conditions.

5. What is the difference between an integrated and remote-mounted capacitive level switch?

An integrated unit combines the electronics and probe in one housing, while a remote-mounted design separates the electronics from the sensing probe.

6. Does a capacitive level switch provide continuous level measurement?

Normally, no. It is primarily a point-level switch used to detect a predetermined high, low, or intermediate level.

7. Can a capacitive level switch detect liquid presence?

Yes. It can detect whether liquid is present at the sensing point.

8. Can it detect high level?

Yes. It can be installed as a high-level alarm or overflow protection device.

9. Can it detect low level?

Yes. It can be configured for low-level alarm and pump dry-run protection applications.

10. Does a capacitive level switch have moving parts?

No. The sensing principle is electronic and does not require mechanical moving parts.

11. Is capacitive level detection affected by the dielectric constant?

Yes. The dielectric properties of the process material are an important factor in capacitive level detection.

12. What is dielectric constant?

Dielectric constant describes how a material affects an electric field and is an important parameter for capacitive sensing.

13. Can sensitivity be adjusted?

Depending on the electronics configuration, sensitivity can be adjusted to match the application and process material.

14. Is calibration required?

Proper calibration or sensitivity adjustment is recommended during commissioning to ensure reliable switching.

15. What is the main advantage of capacitive level detection?

It provides simple, non-mechanical point-level detection for a wide range of liquids and bulk solids.