PROCESSOR FOR PHOTOSENSITIVE MATERIAL

PROCESSOR FOR PHOTOSENSITIVE MATERIAL A pump circulates water from a wash-water chamber to a diverter valve where it can be directed wither to a heat exchanger in a processing fluid chamber or directly back to the water chamber. The temperature of the processing fluid is detected by a sensor, and a microprocessor controls the diverter valve as a function of the temperature detected by the sensor in order to maintain the temperature of the processing fluid at a desired set point. The water temperature increases over a period of time, and may reach a level where the desired set point temperature cannot be maintained. If this occurs, the microprocessor opens a valve to a building water supply to add fresh, cool water to the water chamber.