APPARATUS AND METHOD FOR MONITORING MARKING LIQUID

摘要

A method and apparatus for monitoring marking liquid (83) including a carrier liquid (84) having solid particles (85) therein. A transmitter (82) emits an ultrasonic signal (S) into the marking liquid (83). The ultrasonic signal (S) is received by a receiver (90) and processed by a controller (100) to determine at least one of the temperature of the marking liquid (83) and the concentration of solid particles (85) in the marking liquid (83).