F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
341/111
F25B 49/00 (2006.01) A01J 9/04 (2006.01) F25D 31/00 (2006.01) G05B 15/02 (2006.01)
Patent
CA 1202708
ABSTRACT OF THE DISCLOSURE A microprocessor is used to control the compressor and the fan of a refrigeration system, by the coolant water agitator and the carbonator water supply pump of a carbonated beverage dispensing machine. Water levels in the carbonator and carbonator water supply and the sizes of ice banks built up therein are monitored by interrogating signals applied to an array of sensors or probes in the carbonator and its water supply reservoir. The interrogating signals are under control of the microprocessor and are of short duration with low duty cycle to prevent any plating effects which could otherwise be caused by the probes. The source of the interrogating signals is a low voltage AC supply necessary for components of the dispensing system, in combination with a rectifier and smoothing capacitor together with a clipping diode and a voltage dropping resistor. The microprocessor causes the resistor to be grounded repetitively to generate a square wave voltage signal thereacross. This square wave signal is capacitively coupled to the probes to block any DC component and to apply the balanced AC interrogating signals to the probes.
414796
Chow Edmund E.
Mueller Richard J.
Meredith & Finlayson
Reed Industries Inc.
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