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Introduction to capacitive proximity switches
2011-11-16 10:50:27

Capacitive proximity switch liquid level, non-metal object detection, indicator lights are visible from three sides . 传感器 ,它的测量头通常构成电容器的一个极板,而另一个极板是物体的本身,当物体移向接近开关时,物体和接近开关的介电常数ε 发生变化,使得和测量头相连的电路状态也随之发生变化,由此便可控制开关的接通和关断。 Capacitive proximity switches are a type of position sensor with a switching output . Its measuring head usually forms one plate of a capacitor, and the other plate is the object itself. When the object moves to the proximity switch, the object and the proximity switch The dielectric constant ε changes, so that the state of the circuit connected to the measuring head also changes, so that the switch can be controlled to be turned on and off. 检测物体,并不限于金属导体,也可以是绝缘的液体或粉状物体, 在检测较低介电常数 ε 的物体时,可以顺时针调节多圈电位器来增加感应灵敏度,一般调节电位器使电容式的接近开关在 0.7-0.8Sn 的位置动作。 Capacitive proximity detection objects are not limited to metal conductors, but can also be liquid or powder objects . When detecting objects with a lower dielectric constant ε , you can adjust the multi-turn potentiometer clockwise to increase the sensitivity. Generally adjust the potentiometer to make the capacitive proximity switch operate at the position of 0.7-0.8Sn .

working principle:   Capacitive proximity switches generally have three types: cylindrical, cylindrical, and square. 打开的 电容器电极,该两个电极构成一个电容,串接在 RC 振荡回路内。 The sensing surface of a capacitive sensor consists of two coaxial metal electrodes, much like an " open " capacitor electrode. The two electrodes form a capacitor, which is connected in series in the RC oscillation circuit.

When the power is turned on, the RC oscillator does not oscillate. When a target approaches the capacitor , the capacity of the capacitor increases and the oscillator starts to oscillate. Through the processing of the post-stage circuit, the two signals of vibration and oscillation are converted into switching signals, thereby detecting the presence of objects. The sensor can detect metal objects and non-metal objects. The operating distance of non-metallic objects depends on the dielectric constant of the material. The larger the dielectric constant of the material, the greater the available operating distance. 节多圈电位器来增加感应灵敏度,一般调节电位器使电容 式的接近开关在n7 o.8s When detecting an object with a lower dielectric constant s , you can adjust the multi-turn potentiometer clockwise to increase the sensitivity. Generally, the potentiometer is adjusted to make the capacitive proximity switch between n7 and o.8s . Position action.

范围 电容式接近开关适用于额定交流电压90 250V( CMl2 ) ,额定直流电压 l0 30 的电路中,可对多种非金属,如塑料,纸张,烟草,橡胶,液 体,木材及人体进行检测。 Applications : Capacitive proximity switches are suitable for circuits with a rated AC voltage of 90 to 250V ( except CMl2 ) and a rated DC voltage of 10 to 30. They can be used for a variety of non-metals, such as plastic, paper, tobacco, rubber, liquid , Wood and human body for testing.