the sheathed standard pt resistance thermometer composed of sensitive element, leads, insulator, and stainless steel protective tube is a die assembly after it was drawn out.
protective tube can be made of material can work under high temperature.
保护管可按现场需要选用耐高温保护管。
for not affect the normal running of the railway, through scheme comparison, the scheme of vertical shaft, supporting & protective tube shed, underground excavation, and lining grouting are adopted.