Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1992-12-03
1994-07-26
Woodiel, Donald O.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73745, G01L 716, G01L 2700
Patent
active
053318382
ABSTRACT:
An improved dead weight piston pressure measurement/calibration device includes a cylinder and a dead weight piston assembly that includes a piston rotatable and vertically in the cylinder, bell housing supported by the piston and carrying a number of calibration weights. The weight of the dead weight piston assembly initially is supported by an elastic stop device. Gas from an external source is rapidly forced into the cylinder until the dead weight piston assembly rises in an "elastic" zone defined by the elastic stop device. Such movement is sensed to "proportionally" reduce the rate of flow of gas and stabilize the position of the piston in the second element in a free-floating equilibrium condition, and actuate a drive mechanism that rotates the dead weight piston assembly and maintains the rotation rate in a defined range without producing any sustained vertical or radial displacement forces on the dead weight piston assembly, and thereby avoiding pressure overshoot.
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