When Colgate needed a reliable way to measure their soap bulk storage tanks, they turned to Flowline. The company washes their production equipment between manufacturing runs, and the ready supply of cleaning and disinfectant agents is critical to their process. Soap has been a level measurement challenge for Colgate, due to its extreme tendency to coagulate and foam. Contact level devices such as float, capacitance or pressure sensors, fail over time due to clogging material build up. Non-contact ultrasonic sensors fail when the soap is agitated and foams (absorbing the acoustic signal), which can occur during the tank filling or emptying process. For these reasons, Flowline suggested the use of non-contact pulse radar sensors, whose RF signal is unaffected by most surface foam conditions. The result is reliable liquid soap level measurement. Here, an EchoPulse 26 GHz pulse radar level transmitter is mounted on the top of each soap storage tank. The two-wire, 4-20 mA signal output is connected to the PLC for inventory monitoring and alarms.