All-in-one Ultrasonic Level Instrument derived from a wide range of excellent Level Instruments, and achieve digitations, industrialization, humanized design with sound level measurement functions, control functions, data transmission functions  and man-machine interaction. The set which collects send -and -receive ultrasonic sensors, servo circuit, temperature compensation sensor and that compensates circuit modules, displays, control signals and serial data output or analog output module is one of the explosion-proof level measuring instruments. it has a comprehensive function , stable performance, reliable condition. And it is widely used in explosion-proof and meter fields, such as liquid level measurement or other control occasions.