this above pic shows linear variable displacement transducers that are used in tundish slidegate cylinder pistons to track the position of the piston (and hence the position of the rigidly attached slidegate middle plate).
it is these transducers ( temposonic) that give us the feedback about the overlapping of bores of top-middle-bottom slidegate plates of tundish.
the cylinders in which these temposonics are attached have a stroke length of 90mm while the bore dia of slidegate plates is 40mm. this stroke length of more than double the bore-dia ensures perfect safety of slidegate mechanism.
to my limited knowledge, these temposonics work based on magnetostriction method where a moving magnet causes changes in current flow indicating the position of the magnet (in turn that of the piston).
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