Abstract: 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.

Abstract: 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.