| 摘要 |
PURPOSE:To avoid confusion of abnormality of the output of an exit flowmeter and trouble of a flow rate regulating valve by distinguishing impossibility and possibility of abnormality of the flow rate regulating valve from each other by combination between first-fourth computing elements and a discriminator to detect the abnormality. CONSTITUTION:Computing elements 21-24 use distributed data to calculate various variables V1-V4 and output signals, which indicate three states, namely, whether calculates values are in a normal operation range or are abnormally excessive on the positive side or are abnormally excessive on the negative side, to a discriminator 25. All output signals of computing elements 21-24 are inputted to the discriminator 25, and the discriminator 25 decides the occurrence of trouble of an exit flowmeter 11 to output a flowmeter trouble signal to an alarm device 26 if states of respective input signals have a certain pattern. The flowmeter trouble signal is inputted to the alarm device 26, and this device 26 uses an alarm means of an indicator like a lamp or an alarm like a buzzer to informs that the exit flowmeter 11 is in trouble. Thus, confusion of abnormality of the output of the exit flowmeter 11 and trouble of a flow rate regulating valve 9 is avoided when the output of the exit flowmeter 11 is abnormal.
|
