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Electronic belt scale widely used the parallel method of multiple weighing sensor output signals in the process of industrial production. For each weighing sensor the method cannot separate collection at the same time difficult to determine the fault accurately. Using the TI company MSC1210 single chip microcomputer minimum system and signal separator,to design the pressure sensor fault diagnosis system of the parallel sensor system and to achieve the independent acquisition when the multiple weighing sensor output parallel applications; Invented the cumulative amount calibration method of belt scale weighing sensor,will continue to change the cumulative amount and transformed into quantitative values and realize pressure sensor fault diagnosis of the parallel sensor system. Results show the system better meet the requirements of multiple independent acquisition of the weighing sensor and the fault sensors,for the technology upgrade of parallel sensor system and provide effective means centralized monitoring.