Capacitive Proximity Sensors
22Pages

Capacitive Proximity Sensors Contents General Information Quick Selection Guide . . . . . . . . . . . . . . . . . . . . . . . page 4--2 Technical Definitions and Terminology . . . . . . . . . page 4--3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4--5 Products 875C and 875CP Nickel-Plated and Plastic Barrel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4--9 Accessories Mounting Brackets, Sight Glass Style . . . . . . . . . page 4--21 Sensor Wells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4--22 Indexes Cat. No. Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13--1 Comprehensive Product Index . . . . . . . . . . . . . . . page 14--1 Visit our website: www.ab.com/catalogs. Preferred availability cat. nos. are printed in bold. 4-1

Capacitive Proximity Sensors Quick Selection Guide Visit our website: www.ab.com/catalogs. Preferred availability cat. nos. are printed in bold.

Capacitive Proximity Sensors Technical Definitions and Terminology Axial Approach: The approach of the target with its center maintained on the reference axis. N.C.) A proximity sensor that features both normally open and normally closed outputs, which can be used Correction Factors: Suggested multiplication factors taking into account variations in the target material composition. When figuring actual sensing distance this factor should be multiplied with the nominal sensing Current Consumption: The current consumed by the proximity switch when the output device is in the off condition....

Capacitive Proximity Sensors 4_4 Visit our website: www.ab.com/catalogs. /IK „ j. Preferred availability cat. nos. are printed in bold. sggr nHGn~tSr3QlBy

Capacitive Proximity Sensors Capacitive Proximity Sensors Probe Oscillator Rectifier Output Filter Circuit Capacitive proximity sensors are designed to operate by generating an electrostatic field and detecting changes in this field caused when a target approaches the sensing face. The sensor's internal workings consist of a capacitive probe, an oscillator, a signal rectifier, a filter circuit and an output circuit. In the absence of a target, the oscillator is inactive. As a target approaches, it raises the capacitance of the probe system. When the capacitance reaches a specified...

Capacitive Proximity Sensors Shielded vs. Unshielded Construction Each capacitive sensor can be classified as having either a shielded or unshielded construction. Shielded Probe Shielded sensors are constructed with a metal band surrounding the probe. This helps to direct the electrostatic field to the front of the sensor and results in a more concentrated field. Shielded Probe Shielded construction allows the sensor to be mounted flush in surrounding material without causing false trigger. Shielded Sensors Flush Mounted Shielded capacitive proximity sensors are best suited for sensing...

Capacitive Proximity Sensors Applications Wood Industry Level Detection Liquid Level Detection Capacitive Proximity Sensor Wood Inductive Proximity Sensor Granular Fill Saw Blade Returns for Another Cut Liquid Capacitive Proximity Sensors for High and Low Level Detection Food Processing Capacitive Proximity Sensors for High and Low Level Detection Sight-Tube Level Detection Capacitive Proximity Sensors for “Container Full” Verification Visit our website: www.ab.com/catalogs. Preferred availability cat. nos. are printed in bold. 4-7

Capacitive Proximity Sensors Preferred availability cat. nos. are printed in bold. sggr nHGn~tSr3QlBy

Capacitive Proximity Sensors Plastic Face/Plastic Barrel or Nickel-Plated Brass Barrel proximity sensors are self-contained solid-state devices designed for noncontact sensing of a wide range of Unlike inductive proximity sensors, the solids and liquids in addition to standard metal targets. They can even sense the presence of some targets through certain other materials, making them an ideal choice in some applications where inductive proximity and photoelectric sensors cannot be used. Each unit has an adjustable sensing distance and is equipped with two LEDs to indicate power and output....

Capacitive Proximity Sensors Plastic Face/Threaded Nickel-Plated Brass Barrel Quick-Disconnect Style Quick-Disconnect Style • Metal, nonmetal solid and liquid sensing capability • Adjustable sensing distance for • Normally open or normally closed • Short circuit, overload, reverse polarity, and transient noise • cULus Listed and CE Marked for all applicable directives Correction Factors Correction Factors 4-"10 -^£nfn^ Visit our website: www.ab.com/catalogs. Preferred availability cat. nos. are printed in bold.

Capacitive Proximity Sensors Plastic Face/Threaded Nickel-Plated Brass Barrel Product Selection Approximate Dimensions [mm (in.)] Wiring Diagram Cable Style Normally Open Normally Closed Visit our website: www.ab.com/catalogs. Preferred availability cat. nos. are printed in bold.

Capacitive Proximity Sensors 875C 3-Wire DC Plastic Face/Threaded Nickel-Plated Brass Barrel Approximate Dimensions [mm (in.)] Wiring Diagram Micro QD Style Normally Open or Normally Closed A Potentiometer and LEDs NPN (Sinking) PNP (Sourcing) D C Load + B M12 x 1 - 10…48V DC + 10…48V DC - + - Load + mm (inches) Thread Size A B C D M30 x 1.5 30.0 (1.18) 66.0 (2.60) 53.0 (2.08) 1.0 (0.04) Pico QD Style Potentiometer and LEDs Normally Open or Normally Closed A NPN (Sinking) D -+ C PNP (Sourcing) + Load -- Load B M8 x 1 + 10…48V DC -- + 10…48V DC mm (inches) Thread Size B C D M18 x 1 4-12 A...

Capacitive Proximity Sensors Plastic Face/Threaded or Smooth Plastic Barrel Quick-Disconnect Style Quick-Disconnect Style • Metal, nonmetal solid and liquid sensing capability • Adjustable sensing distance • Normally open or normally closed • Short circuit, overload, reverse polarity and transient noise • cULus Listed and CE Marked for all applicable directives Correction Factors Correction Factors Preferred availability cat. nos. are printed in bold.