Load Cell

This is a load measuring device based on hydraulics and a pressure gauge. The design is from the December 1991 Projects in Metal article titled Load Cell by Robert W. Metze. I'm using a 600 psi gauge until I have a need for something heavier. The design claims suitablity up to 2000 psi before the O-rings tend to extrude in the .001" piston clearance. The psi gauge is direct reading in pounds because the internal piston bore is 1.128" diameter or 1 square inch. The piston has two O-rings to contain the internal pressure from the hydraulic fluid inside.