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Capacitive proximity sensors

Capacitive proximity sensors
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Capacitive proximity sensors

Product catalog summary
Introduction to Capacitive Proximity Sensors
Capacitive proximity sensors are versatile devices capable of detecting both metallic and nonmetallic targets. They are ideal for applications such as liquid level control and sensing powdered or granulated materials. These sensors offer advantages like longer detection ranges compared to inductive sensors and a high switching rate for rapid response. However, they are sensitive to environmental conditions like temperature and humidity.
Operation
These sensors operate based on dielectric capacitance. They consist of a dielectric, an oscillator circuit, a detector circuit, and an output circuit. The approach of an object changes the dielectric constant, causing the sensor to switch on or off.
Influences on Sensing Range
The sensing range is affected by factors such as plate diameter and environmental conditions. Sensitivity adjustments are often required to accommodate different targets and application conditions.
Product Selection Guide
Threaded Body Sensors: Available in 18 and 30 mm diameters, these sensors feature shielded and unshielded sensing, two-wire AC and three-wire DC options, and sensitivity adjustment. They are suitable for liquid level control and nonmetallic targets.
Smooth Body Sensors: These sensors offer longer ranges and include a mounting bracket. They share similar features with threaded body sensors but are available in a 34 mm diameter.
Technical Data and Specifications
Both threaded and smooth body sensors have contact ratings of 300 mA for AC and DC, enclosure ratings of NEMA 1, 2, 3, 3S, 4, 12, 13, and are constructed from POM with nylon 66 nuts. They are CE approved.
Applications
Capacitive proximity sensors are used in various applications such as liquid level detection in packaging, material level control in labeling lines, and counting applications on conveyors.
Overview
The document provides technical specifications and details for capacitive proximity sensors, focusing on threaded and smooth body sensors. It includes information on wiring diagrams, dimensions, operating voltage, and sensor features.
1. Threaded Body Sensors
  • Specifications: Available in 18 mm and 30 mm diameters with sensitivity adjustment and LED indicators.
  • Wiring: Includes diagrams for two-wire (20–250 Vac) and three-wire sensors (10–30 Vdc) with NO and NC outputs.
  • Dimensions: Detailed measurements provided for installation.
2. Smooth Body Sensors
  • Product Description: Type E53 sensors detect both metallic and nonmetallic targets, suitable for liquid level control and sensing powdered materials.
  • Features: Corrosion-resistant plastic body, sensitivity adjustment, and not intended for safety-related use.
  • Product Selection: Includes two-wire and three-wire sensors with various connector options and catalog numbers.
  • Technical Data: Operating voltage, sensing range, shielding, and connection types are specified. AC models have a residual current of 2.5 mA max, while DC models offer short circuit and reverse polarity protection.
  • Wiring Diagrams: Provided for reference with emphasis on pin location.
  • Dimensions: Approximate dimensions and mounting bracket details included.
3. Important Notes
  • Safety Warning: Sensors are not safety devices and should not be used as such. They lack self-checking redundant circuitry, and failure could result in hazardous conditions.
  • Customer Support: Contact information for customer service and application assistance in the U.S. and Canada is provided.
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Catalog excerpts

Capacitive proximity sensors-1

Capacitive Proximity Sensors Threaded Body Introduction Technical Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Threaded Body Sensors Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Data and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Smooth Body Smooth Body Sensors Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Data and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unless otherwise noted, the products contained in this section should not be used for functional safety applications. These products were not designed or tested to IEC 60947-5-3 or recommended for functional safety. Learn Online 4 4 4 4 4 4 4 4 4 4 4 4 4 4 For Customer Service in the U.S. call 1-877-ETN CARE (386-2273), in Canada call 1-800-268-3578. For Application Assistance in the U.S. and Canada call 1-800-426-9184. Volume 8—Sensing Solutions CA08100010E—February 2015 www.eaton.com

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Capacitive proximity sensors-2

Capacitive Proximity SensorsIntroductionTechnical Reference Capacitive Proximity Sensors Capacitive proximity sensors are designed to detect both metallic and nonmetallic targets. They are ideally suited for liquid level control and for sensing powdered or granulated material. Strengths and Weaknesses Consider these strengths and weaknesses of the capacitive proximity sensor: Capacitive Proximity Sensor Attributes Attributes Strengths Can detect both metallic and nonmetallic objects at greater ranges than inductive sensors High switching rate for rapid response applications (counting) Can detect...

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Capacitive proximity sensors-3

Capacitive Proximity Sensors Introduction Operation of the Capacitive Proximity Sensor A capacitor consists of two metal plates separated by a insulator (called a dielectric). The operation of this type of sensor is based on dielectric capacitance, which is the ability of a dielectric to store an electrical charge. The distance between the plates determines the ability of the capacitor to store a charge. Measuring the change in capacitance as an object enters the electrical field can be used as an ON/OFF switching function. Capacitor Operation Plates Capacitive Proximity Sensor Operation 4 4...

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Capacitive proximity sensors-4

Capacitive Proximity SensorsIntroduction Capacitive Proximity Sensor Influences Many of the same factors that influence the sensing range of inductive proximity sensors, also influence the sensing range of capacitive proximity sensors. Environment Many of the same factors that affect inductive proximity sensors, also affect capacitive sensors, only more so. Typically, capacitive sensors have a greater sensing range than inductive sensors. Sensing distance for capacitive proximity sensors is dependent on plate diameter. With inductive proximity sensors, the size of the coil is the determining...

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Capacitive proximity sensors-5

Introduction Smooth Body Capacitive Proximity Sensors Product Selection Guide Threaded Body Capacitive Proximity Sensors Overview These self-contained devices will detect both metallic and nonmetallic targets. A full threaded housing provides ease of mounting. Applications Liquid level control Nonmetallic targets Product Features 18 and 30 mm diameters with threaded housing Shielded and unshielded sensing Two-wire AC—20 to 250V Three-wire DC—10 to 30V, NPN and PNP 2-meter PVC cable or 4-pin micro-connector Short circuit and reverse polarity protected (DC models) LED indicator Sensitivity adjustment...

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Capacitive proximity sensors-6

Capacitive Proximity Sensors Threaded Body Sensors Threaded Body Sensors Threaded Body Sensors Product Selection E53 Threaded Body Sensors . . . . . . . . . . . . Compatible Connector Cables . . . . . . . . . . Technical Data and Specifications . . . . . . . . . . Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . Threaded Body Sensors Product Description Type E53 Capacitive Proximity Sensors from Eaton’s electrical sector are self-contained devices designed to detect both metallic and nonmetallic targets. They are ideally...

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Threaded Body Sensors Product Selection E53 Threaded Body Sensors Two-Wire Sensors Operating Sensing Shielding Connection Type NO Output Catalog Number NC Output Catalog Number 3-pin micro AC connector Unshielded 2-meter cable 3-pin micro AC connector Unshielded 2-meter cable Three-Wire Sensors Operating Sensing Voltage Range (Sn) Shielding Connection Type NO Output NC Output Catalog Number Catalog Number 4-pin micro DC connector Shielded (PNP) 2-meter cable 4-pin micro DC connector 0.59 in (15 mm) Unshielded (NPN) 2-meter cable 4-pin micro DC connector...

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Capacitive proximity sensors-8

Capacitive Proximity SensorsThreaded Body SensorsCompatible Connector Cables Standard Cables 12 Current Rating Voltage Number Pin Configuration/Wire Colors at 600V Style of Pins Gauge Length (Face View Female Shown) Catalog Number Technical Data and Specifications Threaded Body Sensors Maximum load current Switching rate Circuit protection Lights when output is ON Ambient temperature range Enclosure ratings Sensitivity adjustment 250 operations per second Short circuit and reverse polarity Lights when output is ON -13° to 158°F (-25° to 70°C) NEMA 1, 2, 3, 3S, 4, 12, 13...

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