Ash level controlling device for microwave carbon detector

The utility model relates to an ash level control device for microwave measuring carbon instrument, which makes real-time measurement on the carbon content in the fly ashes from boilers. The utility model mainly comprises a lamp of light source and a light activated element at both sides of a glass pipe which conveys fly ashes, an ash ejector which is connected with the outlet of the glass pipe, a motor and a motor control circuit. Owing to a light gathering device arranged in the lamp of light source, light can be gathered into beams and light intensity is enhanced and normal proceed of photoelectric sensing is ensured and blank pipe phenomenon is avoided.