Capacitive sensors can detect both metal and non-conductive materials such as glass, paper, oil, water etc. Capacitive sensors are insensitive to dust and dirt and offer maximum insensitivity to magnetic interference. Capacitive sensors are ideal to use for level measurement of liquids and monitoring of solid materials. Rechner Sensors has special level sensors, the range for level measurement.

Detection range

Capacitive sensors have a detection range of 1 to 25 mm. Capacitive sensors are ideal for harsh conditions with short switching distances and for detection of non-metallic objects.

In addition to the materials to be detected, the following factors are important for the choice of a sensor type:

  • Switching distance
  • Installation type: concise / non-concise
  • Construction: cylindrical / rectangular
  • Connection: connector / cable
  • Output type: PNP / NPN


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Analog level sensor | Rechner Sensors
Capacitive analogue level sensor |  Rechner Sensors


The capacitive analog sensors perform level measurement over a certain range. The analog level sensor can detect contamination. The analog level switch also shows changes in the dielectric constant (DC).

Switching in the PLC

When changing the product or liquid to be measured, the programmable analog level sensor can easily be switched in the PLC. The sensors are equipped with EasyTeach by Wire (ETW). Read more about programmable analog level sensors.


View the Levelmaster XS capacitive sensor




The active surface of the capacitive proximity sensor is designed in such a way that caking materials disappear better and faster from the surface. The level sensor is often used in the chemical and pharmaceutical industry and food industry.

Application for different materials

One capacitive proximity sensor can be used for different materials. The level sensor is equipped with classic or semi-circular electrodes. The active zone enables CIP / SIP up to 121 ºC. Depending on the model, the level sensor can withstand +100 ºC. Read more about the capacitive proximity sensor from Rechner Sensors


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Capacitive proximity sensor 26 series | Rechner Sensors
Capacitive sensor level measurement Smart Paddle | Rechner Sensors

Prevent downtime and faults | Smart Paddle

The Smart Paddle from Rechner Sensors is a capacitive sensor. The level sensor is for the level measurement of bulk goods and is designed for liquids with a dielectric constant of 2 to 80. Connect the level switch electrically and the proximity switch is ready for measurement.

Maintenance free

The capacitive sensor has no moving parts and is maintenance-free. The level switch is ideal for applications where rotating sensors, vibrating forks and mechanical switches are used. Materials with a dielectric constant outside the range of the level switch there is a variant with EasyTeach-by-wire principle. 

Read more about the capacitive sensor for level measurement




Capacitive sensors are implemented in concise and non-concise versions. ATEX versions are required for harsh conditions. ATEX capacitive level meters are resistant to temperatures from -55 ° C to + 125 ° C. In terms of output you can choose between NPN / PNP, NO / NC, namur and relay.


For the food and pharmaceutical industry there are variants with an IP69K seal. With the EasyTeach function the sensitivity of the sensor can be adjusted.


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ATEX equipped capacitive sensors | Rechner Sensors
Waterproof LEAK capacitive sensor | Rechner Sensors


The Rechner KAS-40-LEAK-PTFE-N is a capacitive sensor for leakage control and alarming for containers and pipelines. The capacitive sensor can be mounted in 'drip trays' of plastic, glass or metal. The capacitive sensor has a PTFE metal housing of Ø 38 mm. The sensor is suitable for clean conditions such as the chemical and semiconductor industry.


  • Type: KAS-40-LEAK-PTFE-N
  • IP67 and ATEX 2G
  • Metal housing PTFE
  • 2 mm switching distance


View LEAK capacitive sensors