Measuring and testing – Fluid pressure gauge – With protective separator
Patent
1991-06-14
1993-07-06
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With protective separator
73708, 73718, 73756, 361283, G01L 912
Patent
active
052243834
ABSTRACT:
The invention features a melt pressure measurement device for measuring the pressure of a melted substance useful in cooled state for forming solid objects. The device comprises a probe for insertion through an aperture in a wall of a melt-containing vessel, with the probe having a pressure-deflectable end surface for contact with pressurized melt. The probe has pressure-resistant securing means for fixing the probe in the wall with the end surface of the probe exposed for contact with the melt in a non-flow obstructive relationship. A seal surface on the probe between the end of the probe and the securing means provides cooperative sealing action with a mating sealing means associated with the wall to prevent exposure of the melt to the securing means. The probe also has pressure detection means internal of the probe, responsive to deflection of the end surface of the probe, for detecting pressure of the melt. The pressure detection means comprises a temperature-compensated capacitive sensor, with one plate of the capacitor defined by the end surface of the probe exposed to the melt and the opposite plate of the capacitor mounted within the probe. A capacitive gap is defined by the space between the end surface and the opposite plate. The probe also has electronic circuitry within a portion of the probe remote from the melt-exposed end of the probe and connected to the capacitor in a manner to compensate for change of temperature effects on the capacitor and to generate an output signal proportional to the melt pressure.
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Carr Robert B.
Eggelston Gerard
Frusztajer Boruch B.
Lawhite Leif E.
Pinto Gino A.
Industrial Sensors, Inc.
Woodiel Donald O.
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