| 摘要 |
An electric resistance heating device including a body having a metal mass and a sheathed electric heating element for heating the mass is provided with a temperature sensing thermistor designed for electronic temperature regulation. The thermistor together with the leads thereof is housed in a shrunk thermoplastic, e.g., PTFE, sheath and is inserted into a cavity within the mass closely approaching the heating element sheath through an orifice closed by a metal sealing plug having substantially the same composition and thermal characteristics as the mass. The cavity and the face of the plug are shaped to closely correspond to the sheath containing the thermistor and leads and any air spaces existing between the sheath, the mass and plug are filled with a silicone putty, such as silastene. The sealing plug is force fit within the orifice or inset therein by plastic deformation of the metallic mass.
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