A beverage dispenser with an out of syrup detector is described. The detector analyzes the electrical current drawn by a solenoid valve controlling the flow of syrup. Parameters of the current are compared to known parameters indicative of proper back pressure and known parameters indicative...http://www.google.com/patents/US5757667?utm_source=gb-gplus-sharePatent US5757667 - Solid state pressure detector for beverage dispensers
