Improvements in and relating to pyrometers

Abstract

Abstract 190,657. British Thomson - Houston Co., Ltd., (General Electric Co.). Jan. 27, 1922. Pyrometers.-In a thermo-couple consisting of elements such as tungsten and molybdenum for measuring temperatures up to about 2000‹ C., the couple consists of rods 4, 5 moulded together at one end 6 and packed in a comminuted highly refractory protective material such as carborundum, magnesite &c. The outer surfaces of the rods are preferably first oxidised and the rods and protecting material are packed in a carbon tube in which they are fired up to a temperature of about 2000‹ C. The couple is then removed from the furnace and the protective sheath is then filled or coated with a material such as zirconia to reduce porosity. The coated material may then again be fired. The couple is connected to a millivoltmeter &c. which is preferably so arranged that the needle will indicate only when the tungsten acts as the positive element, i.e. at temperatures above 1050‹ C.

Inventors

No inventors recorded.

Bibliographic Details