BALLUFF sensor output signal analysis introduction

What are the specific parameters of the BALLUFF sensor output signal?

The BALLUFF sensor is a position sensor with a switching output. It consists of an LC high-frequency oscillator and an amplification processing circuit that uses a metal object to generate eddy currents inside the object when it approaches the oscillation induction head that generates an electromagnetic field. This eddy current reacts to the proximity switch, causing the proximity switch to oscillate and the internal circuit parameters are changed, thereby identifying the presence or absence of a metal object, thereby controlling the on or off of the switch. The object that this proximity switch can detect must be a metal object. 2.2 Capacitive proximity switch series Capacitive proximity sensor also belongs to a position sensor with a switching output. Its measuring head is usually one plate of the capacitor, and the other plate is the object itself, when the object moves closer. When switching, the dielectric constant of the object and the proximity switch changes, so that the state of the circuit connected to the measuring head also changes, thereby controlling the switching on and off of the switch. The detection object of the proximity switch is not limited to a metal conductor, and may be an insulating liquid or a powder object. When detecting an object with a lower dielectric constant ε, the multi-turn potentiometer can be adjusted clockwise (located at the rear of the switch) To increase the sensitivity of the sensor, the general adjustment potentiometer makes the capacitive proximity switch operate at the position of 0.7-0.8Sn.

The output types of German BALLUFF sensors are NPN and PNP. In the 1970s, most of the Japanese products were NPN output, and NPN and PNP were available in Western European countries. PNP output proximity sensors are generally used in PLCs or computers as control commands. NPN output proximity sensors are used to control DC relays. In practical applications, the output form should be selected according to the characteristics of the control circuit.

Proximity sensor selection and detection For different material detectors and different detection distances, different types of proximity sensors should be used to make them have a high performance-price ratio in the system. For this reason, the following should be followed in the selection. in principle:
4.1.1 When the test object is a metal material, a high-frequency oscillation type proximity sensor should be used. This type of proximity sensor is most sensitive to the detection of iron-nickel and A3 steel samples. For aluminum, brass and stainless steel samples, the detection sensitivity is low.
4.1.2 When the test object is a non-metallic material, such as wood, paper, plastic, glass and water, a capacitive proximity sensor should be used.
4.1.3 For the long-distance detection and control of metal and non-metal, photoelectric proximity sensor or ultrasonic proximity sensor should be used.
4.1.4 When the test object is metal, if the detection sensitivity is not high, a low-cost magnetic proximity sensor or a Hall-type proximity sensor may be used.