Abstract: A sealant stream anomaly detecting assembly for detecting anomalies such as gas bubbles in a high-pressure sealant stream. The assembly includes an ultrasonic transducer supported on a manifold defining a sensing chamber of a fluid channel. The transducer converts electrical voltage pulses into ultrasonic acoustic pulses and propagates the acoustic pulses through the manifold and into the sensing chamber. The transducer also receives resulting echo pulses from a back wall of the sensing chamber and converts the echo pulses into electrical output impulses. A control module including drive electronics is connected to the transducer. The module detects diminished and lost echo pulses by comparing the output impulse strength values for a given fluid passing through the sensing chamber to a known output impulse strength value for that same type of fluid having no anomalies.