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The principle of high line differential measurement with two
oil lubricated / gas operated pistons allows setting and maintaining the
line pressure with an uncertainty much lower than the overall
measurement uncertainty on either piston. The master and slave pistons
are cross-floated at the line pressure prior to making differential
measurement to minimize the contribution of line pressure errors to
differential pressure. High line differential mode relies upon the very
high sensitivity of oil lubricated / gas operated piston cylinder to set
and stabilize low differential pressure relative to high line pressures.
For more information, please see the
data sheet.
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