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Using a newtonian spring. Simply put, the force applied by the spring is equal to the spring constant times the displacement. Therefore to achieve 1 ton/sq ft, the spring must be displaced a specific distance and because the area of the tip is known, it is easy to calculate the force. The equation would look like this:
Z = (x*K)/A
Z - Pressure
x - Displacement
K - Spring constant
A - Area of the Penetrometer tip
Because the spring is carefully selected the K is known or, at the very least, can be tested analytically to "calibrate" the gauge using a known force.
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