Sensor assembly for detecting ice crystal formation on heat...

Details Sensor assembly for detecting ice crystal formation on heat... Sensor assembly for detecting ice crystal formation on heat...

2007-11-20

2007-11-20

Norman, Marc (Department: 3744)

Refrigeration

Automatic control

By congealed removable product condition

C062S138000, C062S140000, C062S354000

Reexamination Certificate

active

11095540

ABSTRACT:
A sensor assembly for detecting ice crystal formation on a heat exchange surface in an ice-making machine comprises at least one microphone monitoring the sound made by a rotating blade assembly within the ice-making machine during ice slurry formation. A filter filters the output of the microphone to remove background noise. A comparator receives the output of the filter and compares the filtered microphone output with a threshold to determine if the filtered microphone output signifies ice crystal formation on the heat exchange surface. The operation of the ice-making machine can then be adjusted in a manner to allow the formed ice crystals to be removed from the heat exchange surface.

REFERENCES:
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patent: 4796441 (1989-01-01), Goldstein
patent: 4986081 (1991-01-01), Hida et al.
patent: 5884501 (1999-03-01), Goldstein
patent: 6056046 (2000-05-01), Goldstein
patent: 6305189 (2001-10-01), Menin
patent: 2005/0276696 (2005-12-01), LeMieux

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