KJT high temperature rotational speed sensor core component is the use of high temperature magnetic resistance as a detection element, and then after a new signal processing circuit makes it suitable for high temperature environment, function more perfect has been successfully applied to many high temperature working conditions require equipment. Can be 120 ℃ high temperature and stable work in the need for long-term work in a high-temperature environment speed sensor, withstand the temperature and environmental testing, stable transmission signal, long service life.