UQD ball float level transmitter consists of measuring part and signal controller part. According to structural features, the measuring part can be divided into 90 type with small angle, 91 type with large angle, 92 type with external float. Its signal controller part is divided into analog type and intelligent type. The product can be widely used for the measurement of various medium level, and it is an ideal instrument for petroleum, chemical, metallurgy, electric power industries.