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Primary Calibration Publications
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Temperature Measurement in a Primary Flow Calibration Standard  Download PDF
Tom Kegel,
5/1/2004, AGA
Abstract:
One design of primary flow standard operated by CEESI involves measuring the change in the mass of air within a 8.64 cubic meter (305 ft3) pressure vessel. The mass is determined from measurementsof pressure, temperature and the volume of the vessel. The traditional measurement of temperature is made based on two 7.62 meter (25 ft) long RTDs intended to provide an average over the entire volume. More recently a pair of RTD point sensors have been added, one at each end of the tank. The new RTDs are removable for calibration, the averaging RTDs cannot be removed. A test program has been started with three objectives in mind. First, to obtain a better understanding of the thermal transients associated with charging and discharging of the vessel. Second, to develop a method to establish traceability of the averaging RTDs. The final objective is to improve
the system performance. This paper discusses the test program implementation, results and analysis.
A Novel Primary System for Compressible Flow Calibration: Initial Testing and Calibration Download PDF
Tom Kegel and Richard Caron,
1/17/2001, Measurement Science Conference
Abstract:
The operation of a primary system for compressible flow calibration is typically based on either a gravimetric or volumetric method of mass determination. The gravimetric method provides direct determination of mass while the volumetric method utilizes measurements of density and volume. This paper describes the initial testing and calibration of a primary system designed to determine mass using both gravimetric and volumetric methods.
Uncertainty Issues Associated With a Volumetric Primary Flow Standard Download PDF
Tom Kegel,
6/1/2000, ASME Fluids Engineering Division Summer Meeting
Abstract:
A project has been initiated to upgrade a volumetric primary flow standard that has been operating since 1970. Planned improvements include new instrumentation, improved startup flow capacity, analysis of the diverter valve system and additional tank volume data. A new uncertainty analysis is being developed in conjunction with these efforts. This paper concerns that analysis, it is divided into two sections. The first discusses the analysis of historical data being undertaken to support the uncertainty analysis. The second section describes the structure of various components of the uncertainty analysis.
Primary Systems for Calibrating Compressible Fluid Flowmeters Download PDF
Tom Kegel,
10/24/1994, ISA International Conference
Abstract:
A primary calibration system provides for the measurement of mass flowrate by direct comparison of measurements of mass, length, and time. This paper describes two types of primary systems for calibrating flowmeters in compressible fluids. One system involves the direct determination of fluid volume and temperature of fluid. Estimated uncertainties in mass flowrate as low as 0.021 % are achievable with such systems.
Primary Calibration of the Boeing 18 kg/sec (40 lbm/sec) Airflow Calibration Transfer Standard Download PDF
Walt Seidl,
11/16/1986, International Symposium on Fluid Flow Measurement
Abstract:
A calibration was performed by Colorado Engineering Experiment Station, Inc. (CEESI) on selected venturis of the Boeing 18 kg/sec (40 lbm/sec) Airflow Calibration Transfer Standard. the primary flow standard used was a gravimetric standard with a mass flow uncertainty of approximately plus or minus 0.03 percent. An uncertainty of plus or minus 0.05 percent on determination of the discharge coefficient of the venturis was achieved.
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