One of the challenges with most linear displacement transducers (LDTs) for measuring hydraulic cylinder position is that the stroke must be known when the sensor is ordered. Furthermore, in-cylinder mounting generally requires gun-drilling the cylinder's piston rod and mounting a magnet to the piston, both of which add to the final cost of the cylinder. Plus, conventional in-cylinder mounting of LDTs cannot be used with double-rod-end or telescoping cylinders. In these cases, the LDT generally is mounted alongside, rather than inside, the cylinder. Finally, in-cylinder mounting can make LDTs susceptible to damage from radial shock and vibration for strpkes longer than a few feet because the sensor inside the rod has a cantilevered mounting.
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