| 摘要 |
A flowmeter proving device and method for use in proving a flowmeter in situ under operating conditions comprises a pair of standard Coriolis based mass flowmeters ( 2, 3 ) which are connected together in series by a conduit ( 7 ) connecting the fluid outlet ( 23 ) of the first flowmeter ( 2 ) to the fluid inlet ( 32 ) of the second flowmeter ( 3 ). A valved fluid supply conduit ( 4 ) is connected to the fluid inlet ( 22 ) of the first flowmeter ( 2 ), and a valved fluid return conduit ( 8 ) is connected to the fluid outlet ( 33 ) of the second flowmeter ( 3 ). These supply and return conduits ( 4 and 8 ) enable the device to be connected to a fluid flow line containing a flowmeter which is to be proved such that fluid flowing in the flow line will flow in series through the flowmeter to be proved and the two flowmeters ( 2 and 3 ) of the proving device. The device includes control means which is operative to use the second flowmeter ( 3 ) as a master meter to check the accuracy of the flowmeter to be proved, and the first flowmeter ( 2 ) as a check meter for the master meter ( 3 ).
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