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View Paper |
Session Topic: 6E, Pressure Session |
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Paper Title: Automating the Calibration of Two Piston Gage Pressure Balances |
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Date & Time: WEDNESDAY, August 7, 2002 |
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8:30 - 10:00am PARALLEL SESSIONS - SESSION 6 |
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Speaker: Douglas A. Olson
NIST
Tokihiko Kobata |
Email: douglas.olson@nist.gov |
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In this study, we propose a method to automate the data-gathering process in the cross-float calibration of one piston gage pressure balance against a second piston gage pressure balance. The critical element of the method is the use of a high precision pressure transducer to determine the differential pressure between the two pressure balances. The two pressure balances are brought into approximate pressure equilibrium, and then sequentially connected to the pressure transducer to measure the differential pressure. Because the method does not require precisely equal pressure for the two pressure balances, it eliminates adding or removing small “trim” masses. The operator does not need to judge when the pressure is equal. Computer-controlled constant volume valves can be used to connect the pressure balances to the transducer. We present results of the method on a 200 MPa hydraulic system. We explore limitations to the method, including the allowable pressure difference between the two pressure balances, the sequencing procedure of the pressure balances, and the characteristics of the pressure transducer. |
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