Patent ID: 7945414

Claim:
A method for detecting abnormality in a fluid supply line comprising the steps of: providing a fluid supply line equipped with a flow rate control apparatus comprising a pressure sensor provided with a plurality of mechanisms selected from the group consisting of a flow rate setting mechanism, a flow rate/pressure display mechanism, and a flow rate self-diagnosis mechanism, wherein the plurality of mechanisms include at least the flow rate/pressure display mechanism and the flow rate self-diagnosis mechanism; displaying a pressure value on the flow rate/pressure display mechanism; providing a value diagnosed using the flow rate self-diagnosis mechanism; and detecting abnormality of any one of one or more valves of the flow rate control apparatus and one or more valves provided upstream or downstream of the flow rate control apparatus of the fluid supply line by using the value displayed on the pressure display mechanism, or by using the value diagnosed using the flow rate self-diagnosis mechanism, or by using the value displayed on the pressure display mechanism and the value diagnosed using the flow rate self-diagnosis mechanism.