DETECTING METHOD FOR PRESSURE GUIDE PIPE CLOGGING OF AIR PURGE MEASURING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a new and improved detecting method for pressure guide pipe clogging capable of quickly and reliably detecting a clogging phenomenon occurring near the tips of the pressure guide pipes of an air purge measuring system in an early stage.;SOLUTION: This detecting method for the pressure guide pipe clogging is used in an air purge measuring system measuring the back pressure generated in the pressure guide pipes when a fixed quantity of air is purged in a liquid through the measuring pressure guide pipes 2 and 3 inserted into the liquid. The back pressure fluctuating time wave-forms of the pressure guide pipes are measured by a pressure sensor 8, and the pressure guide pipe clogging is detected by the attenuation of the high-frequency component in the power spectrum obtained by conducting the frequency analysis of the back pressure fluctuating time wave-forms with a pressure sensor 8. The pressure guide pipe clogging phenomenon can be reliably detected by this detecting method even if there is a back pressure fluctuation in the pressure guide pipes caused by the disturbance of the liquid level when the liquid in a storage tank 1 is circulated by a pump.;COPYRIGHT: (C)2002,JPO