Refrigeration monitor and alarm system
First Claim
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1. A monitor and alarm system for a refrigeration system including at least one compressor, said system comprising:
- means for sensing the refrigerant level for said compressor and providing an electrical output signal representing the level of the refrigerant;
means coupled to said sensing means for displaying the refrigerant level at a location remote from the refrigerant supply;
means for providing an adjustable reference signal representing a selectable predetermined refrigerant level;
comparator means coupled to said sensing means and said providing means for comparing said electrical output signal and said adjustable reference signal to provide an alarm output signal when the refrigerant level reaches a preset level represented by said adjustable reference signal;
alarm means coupled to said comparator means and responsive of said alarm output signal to provide an alarm indicating a refrigerant level below a predetermined selected level; and
means for adjustable time delay activation of said alarm means, said adjustable time delay means being adjustable to select a time delay interval of a predetermined length after providing said alarm output signal before activating said alarm means.
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Abstract
A refrigerant monitor and alarm includes a sensor positioned to detect the level of liquid state refrigerant in the system and provide an electrical output signal therefrom, a digital display for displaying the refrigerant level, and a circuit coupling the digital display to the sensor for actuating the digital display. In a preferred embodiment, the level display is a bar-graph LED-type display incorporated on a control panel also including a refrigerant level alarm and other parameter alarms.
63 Citations
9 Claims
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1. A monitor and alarm system for a refrigeration system including at least one compressor, said system comprising:
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means for sensing the refrigerant level for said compressor and providing an electrical output signal representing the level of the refrigerant; means coupled to said sensing means for displaying the refrigerant level at a location remote from the refrigerant supply; means for providing an adjustable reference signal representing a selectable predetermined refrigerant level; comparator means coupled to said sensing means and said providing means for comparing said electrical output signal and said adjustable reference signal to provide an alarm output signal when the refrigerant level reaches a preset level represented by said adjustable reference signal; alarm means coupled to said comparator means and responsive of said alarm output signal to provide an alarm indicating a refrigerant level below a predetermined selected level; and means for adjustable time delay activation of said alarm means, said adjustable time delay means being adjustable to select a time delay interval of a predetermined length after providing said alarm output signal before activating said alarm means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification