AUTOMATIC DIAGNOSTIC SYSTEM

PURPOSE:To automatically diagnose and calibrate a transmitter by decreasing the inflow value of the transmitter to zero with a diagnosis instruction signal and detecting the transmitter output at this time. CONSTITUTION:According to the input from a personal computer PC, a module part 9 closes a solenoid valve 5 through a valve driving part 7 and sets the inflow value of fluid to the transmitter 6 to zero. Simultaneously, the module part 9 holds the last output value of the transmitter 6 and sends it to a reception instrument 8, and the input from the transmitter 6 is read and compared with a set value sent from the personal computer PC to send a zero-point calibration command to the transmitter 6 when the set value is not within a range. The transmitter 6 calibrates itself according to the command.