Patent ID: 7063457

Claim:
A fixed-point cell for connection with a thermometer protecting tube comprising: a reference temperature material layer made of high-purity metallic materials to indicate a reference temperature based on a phase change of material which coexists in a two-phase or three-phase state; a container part of a multiple structure having the reference temperature material layer embedded and sealed therein for achieving thermal correlation between the reference temperature material layer and a thermometer protecting tube having a thermometer built therein, the thermometer protecting tube being inserted into the container part while being in contact with the inner circumference of the container part; and fixing means disposed on the top portion of the container part for fixing the thermometer protecting tube to the container part in a fastening manner, wherein the container part includes: a first container opened at one side to receive the thermometer protecting tube and closed at the other side, the first container being of a double structure of an inner casing and an outer casing extending along an axial line from an upper portion to a lower portion; and a second container embedded in the first container and having the reference temperature material layer contained therein, wherein the fixing means includes: a first flange coupled to the opened side of the first container along the coaxial line and facing with the outer circumferential surface of the thermometer protecting tube; and a second flange being in inclinedly close contact with the upper portion of the first flange and coupled with the first flange, wherein the second flange is pressing and fixing the thermometer protecting tube when the second flange forces the first flange to press toward the center of the axial line.