Importance

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Abstract

An electronic scale assembly for transferring refrigerant charge between a tank and refrigeration equipment under service comprises a generally rectangular enclosure that includes a handle positioned along one side edge of the enclosure for manually transporting the scale, and a cover for selectively opening and closing the enclosure. A scale includes a platform mounted within the enclosure at a position to support a refrigerant tank when the cover is open, and a strain gage sensor for providing an electrical signal as function of weight supported by the platform. A solenoid-operated refrigerant transfer valve is mounted within the enclosure for connection between a tank mounted on the scale platform and refrigeration equipment under service for selectively transferring refrigerant between the tank and the equipment through the valve. An electronic controller is responsive to the electrical scale signal for indicating weight of refrigerant transferred through the valve. The electronic controller includes facility for operator programming of a selected charge transfer quantity, opening the solenoid valve upon initiation of a charging operation, and monitoring the scale signal for automatically closing the transfer valve responsive to a change in the scale signal corresponding to the programmed transfer refrigerant quantity.

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First Claim