| 摘要 |
Apparatus for calibrating a fluid flow meter includes a meter prover for detecting a known volume of fluid through the meter including a chamber of known volume, a piston to be moved rectilinearly within the chamber and a motor driving the piston, the chamber being coupled to the fluid flow meter under test to permit the flow of fluid between the fluid flow meter and the chamber. A rotary encoder coupled to the fluid flow meter provides a first indication in the form of a first series of pulses indicative of the fluid flow as measured by the meter. A high precision linear encoder coupled to the meter prover responsive to the movement of the piston provides a second indication in the form of a second series of pulses indicative of the fluid drawn by the meter prover through the fluid flow meter. A control microprocessor is responsive to the movement of the piston to enable the accumulation of the outputs of the two encoders whereby the accumulated value or number of the second series of pulses provides a calibrated, precise manifestation of the fluid flow through the fluid flow meter as measured by the meter prover. |
