The principle of the oil pressure compensator is based on the force balance between the forces acting on the piston. The mechanical force generated by the calibrated weight acts from above on the piston, which is precisely embedded in the cylinder. On the other hand, the system pressure applied through the spindle and transmitted by the calibration medium exerts force on the piston from below. If the two forces balance each other, the piston begins to float in the cylinder and reaches the required test pressure within the system. You can now read the actual pressure displayed on the test item and compare it to the target pressure in the system generated by the group mass placed on it.