Patent ID: 7288226

Claim:
An automatic metal solution dilutor comprising: a material feeding part storing a stock solution to be diluted; a dilution tank mixing said stock solution fed from said material feeding part with a diluent liquid and preparing a diluted solution for diluting said stock solution, said dilution tank having a purging mechanism incorporating compressive gas inward and discharging said compressive gas outward; a measuring device measuring absorbance of said diluted solution in said dilution tank; a metering device metering said diluted solution in said dilution tank with an electronic balance so that a dilution magnification obtained from said absorbance measured by said measuring device reaches a prescribed value; a control part monitoring the value measured by said measuring device and the value metered by said metering device for operating and controlling the quantity of at least either said stock solution or said diluent liquid fed to said dilution tank so that said dilution magnification reaches said prescribed value on the basis of said absorbance measured by said measuring device, and a hopper having said purging mechanism incorporating said compressive gas inward and discharging said compressive gas outward in a path for feeding said diluted solution from said dilution tank, wherein a pipe connecting said dilution tank and said measuring device with each other is at least partially formed by a spiral tube.