A critical parameter for efficient operation of CIL/CIP processes is accurate measurement and control of carbon concentration. Traditional measurement methods are manual, time-consuming and inaccurate, leading to poor process control and gold loss. The C2 Meter is a probe designed to continuously measure adsorption in the tank pulp. Comprising of a matched transmitter/receiver pair of piezoelectric ceramic transducers, it generates and measures ultrasonic signal attenuation.