SAND MEDIA EXPANSION LEVEL DETECTOR AND MEASURING METHOD USING THE SAME

摘要

PURPOSE: A sand media expansion level detector is provided to rationally operate filter basin by accurately measuring if sand media is expanded to the proper range during backwashing and accumulating data on sand media expansion level according to change of water temperature per seasons at the same time, and a measuring method using the same is provided. CONSTITUTION: The sand media expansion level detector is characterized in that it is installed at an overflow weir(40) of sand filter basin of water purification plant and comprises a supporting part(31) integrally formed of metal sheet and stationed on the overflow weir with being inserted onto an upper structure of the overflow weir, and a measuring part(33) which is connected to the supporting part, and on which grooves(34) are vertically formed with being spaced apart from each other in a certain gap, wherein the grooves are formed in a reverse triangular pyramid shape whose upper part is opened, wherein lower and left and right surfaces of the supporting part are opened while upper and front and rear surfaces of the supporting part are closed, and the grooves are formed on the measuring part with being spaced apart from each other in a certain gap with the measuring part being connected to a bar shaped structure connected to one side end of the supporting part and extended to the lower side of the supporting part, wherein hinges(32) are formed on the front side of the supporting part so that the hinges are easily inserted into an inner refraction part of the overflow weir, the measuring part is connected to the supporting part so that the grooves are formed with being spaced apart from each other in a certain distance on a streamlined sheet type structure projected perpendicularly to the wall surface of the overflow weir, and fixing bars are formed between the supporting part and the measuring part to prevent shaking due to the hinges, and wherein water stream resistance preventing holes(36) are perforated on the measuring part.