A dispenser for fluid under pressure has a sensor affixed to it to sense the pressure of the fluid proximate the dispenser discharge opening to generate a pressure reflective signal. A comparator is connected to receive the pressure reflective signal to compare the pressure signal with a preselected...http://www.google.fr/patents/US4668948?utm_source=gb-gplus-shareBrevet US4668948 - Dispenser malfunction detector
