Patent ID: 8398305

Claim:
A thermometer, comprising: a protective tube closed at one end and including a process flange and open end, the closed end of the protective tube for immersion as far as the process flange, in a container in which a medium whose temperature is to be determined is situated; an exchangeable measurement insert which is accommodated, such that it can be changed, in the protective tube; a connection housing in which at least connection terminals for connecting the measurement insert to a remote measured value processing system are arranged, the open end of the protective tube guided to the connection housing, a transition from the open end of the protective tube to the connection housing has a clearance fit with a cylindrical fitting surface between the measurement insert and a fitting sleeve which at least partially surrounds the measurement insert; the clearance fit arranged as an annular gap for allowing gas to be exchanged between the volumes on both sides of the clearance fit.