UREA WATER CONCENTRATION MEASUREMENT DEVICE OF CONSTRUCTION MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a urea water concentration measurement device of a construction machine capable of accurately measuring the concentration of urea water at all times.SOLUTION: A urea water concentration measurement device 10 comprises: an ultrasonic transmission and reception part 21 which is arranged in urea water A and transmits/receives an ultrasonic wave W; an ultrasonic reflection part 22 which is arranged in the urea water A and reflects the ultrasonic wave W transmitted from the ultrasonic transmission and reception part 21 to the ultrasonic transmission and reception part 21; an ultrasonic vibrator 23 which is arranged in the urea water A and removes air bubbles B adhering to a transmission and reception surface 21b of the ultrasonic transmission and reception part 21 and a reflection surface 22b of the ultrasonic reflection part 22; and a control part 30. The control part 30 measures the concentration of the urea water A by using a reception state at the time when the ultrasonic transmission and reception part 21 receives the ultrasonic wave W from the ultrasonic reflection part 22, determines whether or not the reception state is normal and operates the ultrasonic vibrator 23 when it is determined that the reception state is not normal.SELECTED DRAWING: Figure 4