Calibration of and conversion charts for Matheson rotameters

Abstract

To establish uniformity in the calibration of Matheson Series 600 rotameters, a project was undertaken to collect and combine calibration dta on rotameters of the same type. This also serves to eliminate the many individual charts that have been issued in the past and will help to avoid any confusion in the specification of float height and flow rate. Past calibration data, as-well-as new data, on rotameters of the same tube size, float material, and gas, was combined in a computer program utilizing the least squares method of curve fitting. The best fit curve was selected and a conversion chart of float height to flow rate was printed. The report includes a description of the calibration process and the error analysis involved. Since the finalization of the conversion charts and the assigning of tolerances, newly purchased rotameters have been calibrated and issued. All Matheson Series 600 rotameters are being calibrated to, and issued with, these standard charts.