| 摘要 |
PURPOSE:To measure heat conductivity in good preciseness, by a method wherein a current is supplied to an electric hating wire having resitance independent of a temp. to heat a heat generator and a metal pipe encircling the outside thereof is controlled to a predetermined temp. to detect the temp. difference of the heat generator and the metal pipe by a thermocouple or a thermopile. CONSTITUTION:An electric heating wire 3 having resistance independent of a temp. is sealed in a heat generating pipe 1 comprising a metal fine pipe and a current is supplied to the electric heating wire 3 to heat the heat generating pipe 1. The outer pipe 2 made of a metal encircling the heat generating pipe 2 is controlled to a definite temp. to detect the temp. difference of the heat generating pipe 1 and the outer pipe 2 by a thermocouple 4 and the heat conductivity of a heat conductivity measuring cell is measured. Because the thermocouple is used in the measurement of a temp., highly precise measurement is performed. |
