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FIGURE 2.63 Oscillator damping of inductive and capacitive sensors.
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feedback capacitance is detected. In an inductive proximity switch, the oscillation is damped when the target is present (Fig. 2.63). In both capacitive and inductive switch types, the difference between the operate and the release amplitude in the oscillator and corresponding detector circuit is referred to as hysteresis of the sensor. It corresponds to the difference between target detection and release distances from the sensor face.
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Features of Capacitive Sensors
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The major characteristics of capacitive proximity sensors are: They can detect nonmetallic targets. They can detect lightweight or small objects that cannot be detected by mechanical limit switches. They provide a high switching rate for rapid response in object counting applications. They can detect liquid targets through nonmetallic barriers (glass, plastic, etc.). They have a long operational life with a virtually unlimited number of operating cycles. The solid-state output provides a bounce-free contact signal. Capacitive proximity sensors have two major limitations. They are affected by moisture and humidity. They must have an extended range for effective sensing.
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Sensing Range
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Capacitive proximity sensors have a greater sensing range than inductive proximity sensors as shown in the following table.
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Two
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Tubular Diameter, mm 18 30 34
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Inductive Extended Range, mm 8 15
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Capacitive Extended Range, mm 10 20 40
Sensing distance for capacitive proximity sensors is a matter of plate diameter, as coil size is for inductive proximity sensors. Capacitive sensors basically measure a dielectric gap. Accordingly, it is desirable to be able to compensate for target and application conditions with a sensitivity adjustment for the sensing range. Most capacitive proximity switches are equipped with a sensitivity adjustment potentiometer (Fig. 2.64).
2.7.4 Target Material and Size
The sensing range of capacitive sensors, like that of inductive proximity sensors, is determined by the type of material. Table 1.7 lists the
FIGURE 2.64 Sensitivity adjustment.
Material Mild steel Cast iron Aluminum and copper Stainless steel Brass Water Polyvinylchloride (PVC) Glass Ceramic Wood Lubrication oil TABLE 2.7 Target Material Correction
Factor 1.0 1.0 1.0 1.0 1.0 1.0 0.5 0.5 0.4 0.2 0.1
C l a s s i f i c a t i o n a n d Ty p e s o f S e n s o r s
sensing-range derating factors that apply to capacitive proximity sensors. Capacitive sensors can be used to detect a target material through a nonmetallic interposing material like glass or plastic. This is beneficial in detecting a liquid through the wall of a plastic tank or through a glass sight tube. The transparent interposing material has no effect on sensing. For all practical purposes, the target size can be determined in the same manner as for inductive proximity sensors.
Surrounding Conditions
Capacitive proximity devices are affected by component tolerances and temperature variations. As with inductive devices, capacitive proximity devices are affected by the following surrounding conditions: Embeddable mounting. Capacitive sensors are generally treated as nonshielded nonembeddable devices. Flying chips. Capacitive devices are more sensitive to metallic and nonmetallic chips. Adjacent sensors. Allow more space than with inductive proximity devices because of the greater sensing range of capacitive devices. Target background. Relative humidity may cause a capacitive device to operate even when a target is not present. Also, the greater sensing range and ability to sense nonmetallic target materials dictate greater care in applying capacitive devices with target background conditions. Magnetic fields. Capacitive devices are not usually applied in welding environment. Radio-frequency interference. Capacitive sensor circuitry can be affected by RFI in the same way that an inductive device can. Showering arc. An induced electrical noise will affect the circuitry of a capacitive device in the same way it does an inductive device.
Understanding Limit Switches
A limit switch is constructed much like the ordinary light switch used in home and office. It has the same ON/OFF characteristics. The limit switch usually has a pressure-sensitive mechanical arm. When an object applies pressure on the mechanical arm, the switch circuit is energized. An object might have a magnet attached that causes a contact to rise and close when the object passes over the arm. Limit switches can be either normally open (NO) or normally closed (NC) and may have multiple poles (Fig. 2.65). A normally open switch has continuity when pressure is applied and a contact is made, while
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