ULTRASONIC CONCENTRATION METER FOR MEASURING SLUDGE DENSITY AND SLUDGE DISPOSAL SYSTEM

摘要

[Problem] To provide an ultrasonic concentration meter in which the sludge concentration can be accurately measured by switching the frequency of ultrasound according to sludge concentration. [Solution] A controller (36) determines whether or not the sludge concentration has reached a preset concentration value corresponding to the change point in which the frequency is automatically switched. The controller (36), upon determining that the sludge concentration has decreased and reached the preset concentration value from the high-concentration side, automatically switches the frequency of ultrasound (S1) emitted by a transmission sensor (31) from 1MHz to 3MHz. The controller (36), upon determining that the sludge concentration has increased and reached the preset concentration value from the low-concentration side, automatically switches the frequency of ultrasound (S1) emitted by the transmission sensor (31) from 3MHz to 1MHz.