Calibrating device for load cells
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United States of America Patent
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-
Feb 2, 1988
Grant Date -
N/A
app pub date -
Apr 13, 1987
filing date -
Apr 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device (100) for calibrating load cells is provided. Device (100) features an intermediate chamber (8) providing fluid communication between spaced-apart fluid chambers (4) and (6). Chambers (4) and (6) have respective upper open ends (5) and (7) with chamber (4) connected to a plunger member (12) by a flexible seal (14) and chamber (6) connected to a plunger member (20) by a flexible seal (18) such when dead weights W.sub.1, 2 . . . n are placed upon plunger (12) fluid pressure exerts an upward force (F) against plunger (20) for calibrating a load cell (2) placed between plunger (20) and a rigid frame (21) that is defined by the equation: F=(A.sub.R /A.sub.P)(W.sub.1, 2 . . . n +W.sub.P -S.sub.P)-W.sub.R -S.sub.R Where: A.sub.R =area of plunger (20) A.sub.P =area of plunger (12) W.sub.P =weight of plunger (12) S.sub.P =resistance force of seal (14) W.sub.R =weight of plunger (20) S.sub.R =resistance force of seal (18).
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