Low Flow Liquid Calibration Setup

This article describes a primary calibration setup, and its uncertainty, for low flow liquid calibrations at Bronkhorst High-Tech. It will be used to calibrate reference flow meters from 1 to 200 g/h. By setting up an uncertainty budget for this setup, the calibration of the instruments can be compared to that of NMI’s (National Metrology Institutes). The uncertainty budget consists of mass, time and mass flow uncertainties/corrections that need to be taken in to account for determining the traceable mass flow. Tests results of different flow meters/actuators measured on the setup support the calculated uncertainty. By participating in an intercomparison with NMI’s the measurement and uncertainty of this setup is traceable to European NMI’s

Low Flow Liquid Calibration Setup

This article describes a primary calibration setup, and its uncertainty, for low flow liquid calibrations at Bronkhorst High-Tech. It will be used to calibrate reference flow meters from 1 to 200 g/h. By setting up an uncertainty budget for this setup, the calibration of the instruments can be compared to that of NMI’s (National Metrology Institutes). The uncertainty budget consists of mass, time and mass flow uncertainties/corrections that need to be taken in to account for determining the traceable mass flow. Tests results of different flow meters/actuators measured on the setup support the calculated uncertainty. By participating in an intercomparison with NMI’s the measurement and uncertainty of this setup is traceable to European NMI’s

Low flow liquid calibration setup

This article describes a primary calibration setup and its uncertainty for low flow liquid calibrations at Bronkhorst High-Tech, which is traceable to international standards. It will be used to calibrate reference flow meters from 1 to 200 g/h. By setting up an uncertainty budget for this setup, the calibration of the instruments will be traceable. The uncertainty budget consists of mass, time and mass flow uncertainties/corrections that need to be taken in account for determining the real mass flow. By participating in an laboratory intercomparison the accuracy and calculated uncertainty of this setup is traceable to international standards at several European national metrology labs

Extending the accredited low flow liquid calibration range

There is an increasing demand for ISO/IEC 17025:2005 accredited liquid flow calibrations in the range of 1 g/h to 30 kg/h. The accredited Low Flow liquid Calibration Setup [1] (LFCS) at Bronkhorst® covers a flow range of 1 to 200 g/h, leaving a traceability gap in the flow range of 0.2 to 30 kg/h. By extending the calibration setup with two new balances it can perform calibrations from 1 g/h to 30 kg/h, thus covering the traceability gap. Crosschecks between references show good consistency and the setup extension was successfully accredited for ISO/IEC 17025:2005 calibrations. By participating in an intercomparison with National Metrology Institutes (NMI’s) the uncertainty of the LFCS extension is traceable to European NMI’s