ifm capacitive sensors

Capacitive sensors are used for the non-contact detection of any objects. In contrast to inductive sensors, which only detect metallic objects, capacitive sensors can also detect non-metallic materials. Typical applications are in the wood, paper, glass, plastic, food and chemical industries.

Operating principle
The capacitance between the active electrode of the sensor and the electrical earth potential is measured. An approaching object influences the electrical alternating field between these two "capacitor plates". This applies to metallic and non-metallic objects. In principle, capacitive sensors work with an RC oscillator. A very small change in capacitance is enough to influence the oscillation amplitude. The evaluation electronics converts this into a switched signal. The sensitivity can be set with a potentiometer.

Increased noise immunity
When detecting objects very small changes in capacitance of 0.02 pF (with a basic capacitance of the electrode of 0.2 pF!) must be reliably converted into useful switched signals. This makes high requirements for the electronics as the circuit and design-related parasitic basic capacitances (e.g. conductive tracks, input capacitances of the components) can be much higher thus making a precise capacitance measurement much more difficult. ifm electronic therefore developed a future-oriented solution to this problem. A new sensor circuit effectively avoids the indicated problems of the RC oscillator with an acceptable level of input. The new circuit concept achieves much better values with respect to all relevant noise parameters. Special attention was given to very common noise sources in practice (frequency inverters, switched-mode power supplies, stepper-motor controllers, etc.).

[ifmgroup]

Hello
We uploaded all the latest versions of our ifm videos. You will find them in the playlist 'English'.
If we release new videos, we will also add them to the playlist.
If there is a specific video you cannot find, please feel free to contact us!
Thank you!

[ashutoshsrivastava]

Can this be used to sense PET bottles exclusively? Using dielectric constant ? or some other parameter?

[wbrokow]

What would the wiring look like to take the output from the KG0009 into an arduino?
It has only 2 wires

[richardkhyriem]

hello, i need touch sensors with counter display for e.g 30 of students at the same time they shoot with an arrow to the board so, I need the results to show on display that whenever the arrow touches the board it will count it as 1, 2, 3, 4, 5, 7, 9, 10, 11, 17.18 etc. ..so is there any sensors or any systems like that

[ConstantineJoseph]

Hi can I use this for my DC motor.  I'm using contact brushes for commutation but I would love to use this for my DC motor to become brushless.

about 100 rpm to 3600 rpm

[punithmaheshroyal]

Hii thanks for sharing the valuable information
Is there any sensor to identify the wood or is there any sensor which will identify the particular thing by its smell

[rohithkumars]

Is this sensor can detect paint present inside the closed pipe line....?

[jibba]

How do you fill the cylinder without the sensor detecting the liquid entering the cylinder?

[monisbilalshamsi]

Can it detect a dough ball or a dough sheet..

[VinodKumar-yjdu]

What write on inductive and capastive sensor

[mechatronicssrm]

can we use this sensor(capacitive) for detection of plastic, metal and paper material.

[SithaarthaBaarathy]

Hi I saw your video and Its preety amusing :) Im doing a project called by smart dustbin and Im using capacitive sensor to detect metal and non-metal Can you explain on It :)
TQ

[joelrocas]

would appreciate if you can also upload the other videos(latest products in ifm website). will use it as reference for marketing purposes.. regards,