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On site we use a mechanical dipping level gauge equipped with an LVDT to measure the level of molten glass (1100 C). Often we have failures, the mechanism seizes due to the heat or glass is picked up by the Pt tip. I remember during my training as instrument tech, it is possible to use a bubbler tube and Dp cell, has anyone used these with molten glass/metal/syrup? What repeatability is possible? Currently the sensor we use is good for 0.1mm.