| 摘要 |
PURPOSE:To measure flow rates of various kinds of pneumatically carried fine particles with high precision by correcting a measured flow rate while using the ratio of the weight variation rate of a transport tank and the sum of flow rate outputs of respective detectors of a transport tube as a coefficient of calibration, and obtaining the absolute mass flow rate of fine particles. CONSTITUTION:An electrostatic capacity type correlation type fine particle flow meter 3 consists of detectors 3 and converters 3b, and outputs of the converters 3b are inputted to a microcomputer 4. A load cell 5 is installed in the transport tank 1 and a weight value is processed by a load cell converter 6 and inputted to a microcomputer 4 to calculate a weight variation rate rho. The microcomputer 4 calculates the ratio K=SIGMAfi/rho to the sum SIGMAfi of the flow rate meter at constant intervals and calculates and outputs Fj=fj/K as a flow rate value. Consequently, even if the kinds of fine particles change, the constant K of conversion is calculated successively, so the accurately absolute mass flow rate is measured successively.
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