The correct answer to the question is:
- Flow prover
A flow prover is a device used to calibrate and verify the accuracy of large-capacity displacement meters. It works by comparing the meter's readings with a known standard flow rate. By using a flow prover, technicians can ensure that the meters are measuring the flow of liquids accurately and consistently.
Flow provers come in different types such as master meters, compact provers, and portable provers. These devices play a crucial role in industries where precise measurements of liquid flow are essential, such as in oil and gas, water treatment plants, and chemical processing facilities.
In contrast, the other options mentioned in the question – orifice well tester, sonic flow nozzle, and choke nipple – are not typically used for proving large-capacity displacement meters. Each of these devices serves different purposes in flow measurement and control, but they are not designed specifically for the calibration and verification of large-capacity displacement meters.
