| 摘要 |
<p>PURPOSE: To detect to identify the abnormality in a flow rate control valve in a flow rate control facility and the malfunction in a pipe route. CONSTITUTION: A valve opening/flow rate characteristic calculating section 109 determines the valve opening/flow rate characteristics from an inputted valve opening signal Z and a flow rate Q at the valve opening. A judgment calculating section 111 compares the flow rate determined from valve opening/ flow rate characteristics with the measured flow rate, and produces a judgement 1 signal when the difference of both flow rates exceeds the value judged to be abnormal. On the other hand, the valve operating sound has been frequency analyzed in a frequency characteristic calculating section 110 of the sound occurred in valve opening and shutting, and the judgment calculation section 111 also produces a judgment 2 signal when the deviation between the analyzed data and the measured value exceeds the value judged to be abnormal. A warning output section 112 diagnoses an abnormal portion from the combination of the judgment 1 and the judgment 2.</p> |
