Capacitive proximity switches
Manufacturer: EGE Elektronik
Category: Capacitive proximity switches
A capacitive proximity switch works with a high frequency oscillating circuit that creates an electromagnetic field on the active sensor surface by means of a capacitor. When a substantial object or fluid substance nears this field, a capacitance unbalance occurs and leads to a variation of the amplification in the oscillating circuit. If this amplification exceeds a threshold value, a switching signal is generated.
Capacitive proximity switches are available as IP 69K sensors up to 90 °C and well suited for corrosive environments. High temperature switches for temperatures up to 200 °C are available as well. Large switching distances up to 120 mm and sensors made from PTFE or PEEK, especially well-suited for the food industry, are also part of the product program.
These special sensors are also extremely resistant to chemicals. Analog sensors determine distances. EX-proof sensors in accordance with ATEX are available as dust-EX and gas-EX sensors.