KJT forward and reverse speed sensors are used to detect the rotational and linear speed of the wheel axle, and the speed of the measured body can also be obtained through computational processing. The sensors have good low and high frequency characteristics. Low frequency can be up to 0Hz for zero speed measurement of rotating machinery, and high frequency up to 20KHz, which can meet the high speed measurement requirements of most industrial fields. As YD69 can give two kinds of rotational speed signals with certain phase difference, it can be used for forward and reverse rotation judgement. It is easy to install, no contact with the measuring gear, no wear and tear, the output waveform is square wave, the duty cycle is about 50%; the speed range is wide, the temperature is widely adapted, the vibration resistance is strong, and there are power supply polarity protection and output short-circuit protection.
