Evaluation of characteristic Oval gear type flow meter with sonic nozzles

Abstract

The oval gear type flow meter was taken up as a candidate of a working standard, and it was examined whether this had an enough performance as a working standard. As a result, when the Reynolds number larger than 1000, reproducibility of flow rate became ±0.17%. Therefore, oval gear meter uncertainly is 0.43% (coverage factor k=2). But it was able to make correction curve for flow rate and can correction. Finally therefore, uncertainty becomes 0.26% (coverage factor k=2).