Abstract:To explore the mechanics of vacuum cooling and optimize vacuum precooling instrument, the real-time measurement of the variation of multi-parameters such as the pressure in the vacuum chamber, temperature of the condenser, temperature and mass of fruits and vegetables during vacuum cooling was necessitated. The self-designed vacuum cooling set up and the data acquisition processing system were presented. It was the weight sensor innovatively taken into the vacuum chamber that realized the online measurement of product quality during vacuum cooling.