Dynamics of the Bell Prover, II.
The bell prover is widely used for gas flowrate measurements by timing a known stroke of the bell as it rises, presumably with a constant speed, from a bath of sealing liquid. A differential equation for the bell motion (from the previous paper of the same title) is used together with the previous equations of motion for the gas and sealing liquid modified here to provide the basis for a computer simulation of the prover performance. Examples of the results of the computations show substantial fluctuations in all of the motions and modified measurement procedures for improved accuracy are discussed. Proposed modifications to the prover itself are shown by the computations to dampen the fluctuations and to improve the measurement accuracy. Only a limited number of changes of the prover design and of the initial conditions were researched for their effect.
National Institute of Standards and Technology, Gaithersburg, MD 20899.
Fillmer W
FW
Ruegg
National Institute of Standards and Technology, Gaithersburg, MD 20899.
Fillmer C
FC
Ruegg
bell prover design; calibration procedures; flow meter calibration; flow rate; gas flow measurement; gas flow standard; prover