。 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. 的 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. 像 “ 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( 除 CMl2 外 ) ，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.