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Pressure measurement system for refrigeration system Patent #: 5311745
AbstractA super heat calculator for air conditioning systems comprising a microprocessor, a control panel, a temperature sensor, and a pressure sensor. Vapor pressure models for all expected air conditioning refrigerants are stored in a data storage unit of the microprocessor. Positioning a rotary switch on the control panel directs the microprocessor to utilize the vapor pressure model associated with the refrigerant assigned to the switch position. The temperature sensor and pressure sensor are installed between the evaporator and compressor of the air conditioning system. The temperature and pressure signals are sent to a dual slope analog to digital converter located in the control panel. The temperature of the refrigerant is automatically displayed when the calculator is turned on. Pressing the SUPER-HEAT button on the control panel initiates calculation of the degree of super heat. The microprocessor reads the refrigerant temperature and pressure values and stores them in the storage unit. The data processor accesses the vapor pressure model that corresponds to the refrigerant selected by the rotary switch and calculates the vapor temperature which corresponds to the sensed refrigerant pressure by interpolation. The data processor then calculates the super heat value by subtracting the calculated vapor temperature from the value of the sensed refrigerant temperature.