| 摘要 |
The tube connection consists of a pipeline (1) and a connecting piece (6), one of which has a temp. indicator. The temp. is indicated by change in the colour of a material, the change in temp. of which is a function of the temp. of the pipeline or the connecting piece. The temp. indicator may be on the inner wall of the pipeline. It may consist of a liquid crystal or a thermochrome coloured material. It may have at least one cylindrical sector with a transparent wall sector, threaded coupling pieces and an inner metal tube with a temp. indicator on the outside of it.
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