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Capacitive Sensors

Product catalog summary

Overview: The document from EGE-Elektronik Spezial-Sensoren GmbH provides comprehensive information on capacitive sensors used in automation, detailing their types, specifications, operating principles, and installation guidelines.

Operating Principle: Capacitive proximity switches function through a high-frequency oscillating circuit that generates an electromagnetic field. When a substance approaches, it disrupts the capacitance balance, triggering a switching signal if a threshold is surpassed.

Operating Distance: This is the distance at which a switching signal is produced, influenced by the sensor's surface diameter and the material's dielectric constant. A table in the document lists reduction factors for various materials.

Key Parameters:

Rated Operating Distance (sn): A device parameter unaffected by external factors.
Effective Operating Distance (sr): The distance at nominal voltage and temperature.
Usable Operating Distance (su): Ranges between 80% and 120% of the real operating distance.
Assured Operating Distance (sa): Accounts for external influences, ensuring guaranteed switching.

Technical Specifications:

Switching Frequency: Determined at half the nominal operating distance.
Supply Voltage: Safe operating voltage range.
Switching Current: Maximum long-term current at 25°C.
Short Circuit Protection: Prevents damage from short circuits.
Reverse Polarity Protection: Prevents damage from reversed voltage supply.

Installation and Mounting: Provides guidelines for flush and non-flush mounting, including required free zones and torque limits for different housing materials. Instructions for serial and parallel connections are also included.

Standards and Certifications: Sensors comply with various EN standards for safety, EMC, and protection, including TÜV NORD CERT ISO 9001 certification.

Product Range: Lists various series of capacitive sensors, including standard and special switches, high-temperature sensors, and sensors for explosive environments.

Specifications:

Design and Dimensions: Available in various designs such as DC PNP and AC, with thread sizes including M18x1, M30x1.5, Ø20 mm, Ø34 mm, Ø80 mm, and Ø100 mm.
Installation: Sensors can be installed flush or non-flush, affecting the operating distance.
Operating Distance: Ranges from 8 mm to 70 mm, depending on the sensor type and installation method.
Supply Voltage: DC sensors operate between 10-55 V, while AC sensors operate between 20-250 V.
Switching Current: Typically 400 mA for most sensors.
Protection and Durability: Most sensors are rated IP67 or IP68, indicating high resistance to dust and water.
Temperature Range: Standard sensors operate between -25°C to +70°C, while high-temperature sensors can withstand -40°C to +200°C.

Procedures and Standards:

Short Circuit and Overcurrent Protection: Most sensors include short circuit protection and overcurrent release mechanisms.
Reverse Protection: Available in DC sensors to prevent damage from incorrect wiring.
EMC Class: All sensors conform to EMC Class A standards.

Recommendations and Best Practices:

Installation: Ensure proper installation (flush or non-flush) to achieve optimal operating distance.
Environmental Considerations: Select sensors with appropriate IP ratings and temperature ranges for the intended application environment.
Accessories: Fixing nuts and mounting clamps are often included or recommended for secure installation.

Key Data from Tables:

Switching Frequency: Typically 10-25 Hz, depending on the sensor model.
Voltage Drop: Maximum voltage drop is generally 1.5 V for DC sensors and 10 V for AC sensors.
Current Consumption: Varies between 2.5 mA to 12 mA when not actuated.

Conclusion: EGE-Elektronik offers a wide range of capacitive sensors suitable for various industrial applications, with robust protection features and adaptability to different environmental conditions. Proper selection and installation are crucial for optimal performance.

Catalog excerpts

Special-Sensors for Automation Capacitive Sensors

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We reserve the right to make technical alterations without prior notice. EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.

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Capacitive Sensors Operating Principal 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 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. Operating Distance The operating distance is the separation of an object from the active sensor surface at which a switching signal is produced. The...

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Capacitive Sensors Supply voltage The operating voltage is the voltage range in which EGE sensors function safely. For a constant voltage supply it is important to make sure that the limits are still observed when the residual ripple is included. Switching current This current gives the maximum long-term current for the switching output of the sensor at an ambient temperature of 25 °C and ohmic load. At an elevated ambient temperature, the current load capability decreases. For analog outputs, the boundary values given in the appropriate technical data, and particularly the permissible values...

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Capacitive Sensors Collocation When collocating the sensors, a minimum separation must be kept between the devices in order to avoid mutual influence. When in doubt, a test should be conducted under application conditions. For flush mounting the lateral separation between two sensors must correspond to at least the diameter of the sensor. For non flush mounting, the lateral separation from each other must correspond to at least twice the diameter of the sensor. For separations greater than eight times the diameter no mutual influence is to be expected. For oppositely mounted sensors, a minimal...

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Capacitive Sensors Standard switches Series KGK Plastic-thread M12x1 DC 10…33 V Installation flush (f) non flush (nf) 10 Operating distance sn [mm] Switching output ID-No. Type Supply voltage [V] Switching current [mA] Short circuit proof Overcurrent release [mA] Reverse protection Voltage drop max. [V] Residual current [mA] Current consumption (not actuated) [mA] Switching frequency [Hz] Ambient temperature [°C] EMC-class Protection [EN 60529] LED display Housing material Connection Accessories (see page 4.28) EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com Fixing nuts are...

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Installation flush (f) non flush (nb) Operating distance sn (Adjustable range) Switching output ID-No. Type Supply voltage [V] Switching current [mA] Short circuit proof Overcurrent release [mA] Reverse protection Voltage drop max. [V] Residual current [mA] Current consumption (not actuated) [mA] Swiching frequency [Hz] Ambient temperature [°C] LED display Housing material Connection Connection diagram fixing nuts are part of delivery EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektron

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Capacitive Sensors Standard switches Series KGK Plastic-thread M18x1 DC 10…55 V Installation flush (f) non flush (nf) LED Pot. Operating distance sn [mm] (Adjustable range) Switching output ID-No. Type Supply voltage [V] Switching current [mA] Short circuit proof Overcurrent release [mA] Reverse protection Voltage drop max. [V] Residual current [mA] Current consumption (not actuated) [mA] Switching frequency [Hz] Ambient temperature [°C] EMC-class Protection [EN 60529] LED display Housing material Connection Accessories (see page 4.29) EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com...

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Installation flush (f) non flush (nf) Operating distance sn (Adjustable range) Switching output ID-No. Type Supply voltage [V] Switching current [mA] Short circuit proof Overcurrent release [mA] Reverse protection Voltage drop max. [V] Residual current [mA] Current consumption (not actuated) [mA] Switching frequency [Hz] Ambient temperature [°C] LED display Housing material Connection Connection diagram Fixing nuts are part of delivery EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com

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Installation flush (f) non flush (nf) Operating distance sn [mm] (Adjustable range) Switching output ID-No. Type Supply voltage [V] Short circuit proof Overcurrent release [mA] Reverse protection Voltage max. [V] Minimum load current [mA] Current consumption max. [mA] Switching frequency [Hz] Ambient temperature [°C] EMC-class Protection [EN 60529] LED display Housing material Connectiob Connection diagram Fixing nuts are part of delivery EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com

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Installation flush (f) non flush (nf) Operating distance sn (Adjustable range) Switching output ID-No. Type Supply voltage [V] Short circuit proof Overcurrent release [mA] Reverse protection Voltage drop max. [V] Minimum load current [mA] Current consumption (not actuated) [mA] Switching frequency [Hz] Ambient temperature [°C] LED display Housing material Connection Connection diagram Fixing nuts are part of delivery EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com

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Installation flush (f) non flush (nf) Connection diagram Mounting clamps 0 20 mm (Z00100) are part of delivery EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com

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Series KNK Smooth-body switches 034 mm DC 10...55 V Installation flush (f) non flush (nf) Operating distance sn (Adjustable range) Switching output ID-No. Type Supply voltage [V] Switching current [mA] Short circuit proof Overcurrent release [mA] Reverse protection Voltage drop max. [V] Residual current [mA] Current consumption (not actuated) [mA] Switching frequency [Hz] Ambient temperature [°C] LED display Housing material Connection Connection diagram Mounting clamps 0 34 mm (Z00102) are part of delivery EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com...

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Capacitive Sensors

Capacitive Sensors

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