Patent ID: 6396280
Filing Date: 2002-05-28
Classification: C23G,G05D

Abstract:
An acid concentration controlling system comprising (i) an acid concentration measuring apparatus comprising:a body which is installed on a portion of a flow path of pickling solution which is taken from a pickling tank, the flow path being connected to the pickling tank, a density sensor which measures the density of the pickling solution flowing within the body, a temperature sensor which measures the temperature of the pickling solution in the flow path or the pickling tank, a conductivity sensor which measures the conductivity of the pickling solution in the flow path or the pickling tank, and a calculating apparatus which calculates the acid concentration of the pickling solution flowing through the portion of the flow path, based on the measurements by the density sensor, the temperature sensor, and the conductivity sensor, and (ii) a feedback control means which adjusts the acid concentration of the pickling solution in the pickling tank to which the acid solution is supplied based on a calculated value of the acid concentration obtained by the acid concentration measuring apparatus.