Solid - concentration mes in front of the direction and method thereof, and solid - concentration control system

摘要

A solid - concentration mes in front of the direction is followed by an ultrasonic transmitter (23), an ultrasonic receiver (24) and a response time integrator (26g) a. The ultrasonic transmitter (23) sends a single pulse - ultrasonic wave to a liquid toner. The ultrasonic receiver (24) receives the single pulse - ultrasonic wave. The ultrasonic transmitter (23) again sends a single pulse - ultrasonic wave, after a predetermined period of time starting from the time has lapsed when the ultrasonic receiver (24) receives the single pulse - ultrasonic wave. The response time integrator (26g) measures a response time of the transmission to the reception of each individual pulse - ultrasonic wave and integrates the response time in relation to each set of n pulses (n 1). A solids concentration of the liquid toner is on the basis of the integrated response time is calculated.