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Capacitive sensors

Proximity switch for non-contact detection of liquid as well as solid objects and bulk solids

High switching distance up to 15 mm
Detection through plastic walls
Absolutely reliable even when interfered by ambient conditions, e.g. ambient light or dirt
Objects such as wafers, PCBs, paper stacks, plastic containers or powders and granulates as well as liquids are perfectly detected

Product portfolio

Sensors in a metal housing

Cylindrical sensor designs M12 and M18
Flush mount
Sensitivity configurable variants with defined default switching point
Switching distance up to 8 mm

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Sensors in a plastic housing

Cylindrical sensors M12 and M18
Flush / non-flush mount
Sensitivity configurable
Variants with defined default switching point
Switching distance up to 15 mm

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Particularly flat design

Flat housing with a height of only 6 mm
Flush mount
Flexible and easy installation with unique mounting frame
Optional cascading of several sensors
Switching distance up to 15 mm

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Capacitive level sensors

Non-contact detection through container walls
Compensation of foam and adhesion
Direct contact even in aggressive media
Easy mounting
Robust and resistant

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Capacitive sensor PL240 for point level detection without impairments by films and adhesion

Non-contact level detection, even if the inside walls of the tank are covered in microfilm or residue: Thanks to its innovative, intelligent measuring principle, the new PL240 capacitive sensor reliably detects fill levels even under challenging conditions.

Your benefits

Outstanding longevity and high process safety by non-contact sensing principle
- Switching distance up to 15 mm and particularly flat design enable installation in a protected position and close to the process
Reliable detection of many different object materials
- Independent of color, gloss or surface properties
- Insensitive to dust and dirt
- Sensors with flush installation are especially recommended for non-conductive (dielectric) media
- Designs for non-flush installation are ideal for detecting conductive media and filling levels

Applications

Presence detection of plastic boxes

Easy installation of the sensor in a protected position
Large sensing distances ensure reliable box detection
Resistant to dust and dirt

Wafer detection in solar cell manufacturing facilities

Reliable wafer detection thanks to large sensing distances
Flush mounting possible thanks to flat design
Detection regardless of transparency or brightness of the objects

Granulate bulk goods detection in injection molding plants

Thanks to their rugged design, these sensors are protected against mechanical abrasion
Surface-independent detection
Fast and easy installation

Technology

The capacitive sensor basically functions like an open capacitor. An electrical field is formed between the measuring electrode and the GND electrode. If a material with a dielectric constant εr greater than air enters the electrical field, the capacity of the field increases depending on the εr of this material. The electronics measure this capacity increase, the generated signal is conditioned during subsequent signal processing and causes output switching at a corresponding magnitude.

Flush-mountable and non-flush mounting procedure
Flush mounting of flush-mountable capacitive sensors is possible in all materials. The minimum distance between the sensors must be observed. For non-flush mountable capacitive sensors, a free zone must be created around the sensor head which must not contain any damping material.