Compression column load cell
AssigneeThe Flintec Group, Ltd.
InventorRolf P. Haggstrom
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Abstract
Simple and inexpensive electrical compensation for off-axis and off-center loading sensitivity is possible in compression column load cells comprising a pair of compensation strain gages in series with each of the main strain gages in the load cell. The compensation gages are arranged crosswise to each associated main strain gage, and connected in series with their associated main strain gage. Each set of one main strain gage and two series connected compensation gages form one bridge arm in a strain gage bridge. Two compensation gages meet at each bridge corner, and are shunted by a common trimming resistor. The loading sensitivity compensation works for both conventional fixed axis load cells and Rocker Pin load cells.
Claims6
A compression column strain gage load cell, comprising:
- a first strain gage arranged to measure a principal strain in the compression column;
- and
- a pair of second strain gages in orthogonal alignment with and arranged symmetrically to said first strain gage, said second strain gages having substantially lower resistance than said first strain gage.
Dependencies are inferred from the claim text.