G - Physics – 01 – N
Patent
G - Physics
01
N
324/30
G01N 22/00 (2006.01)
Patent
CA 1326262
ABSTRACT OF THE DISCLOSURE: An apparatus for use in analyzing materials for ash content includes a walled chamber which retains microwave radiation therein, a source of microwave radiation, such as a magnetron, for radiating onto contents of such chamber, and an ashing furnace in the chamber which includes a heat resistant wall of low thermal conductivity, which is transmissive of microwave radiation, and a microwave absorptive material which is capable of being heated by microwave radiation to an ashing temperature. The furnace includes a passageway through it for the entry into the furnace cavity of a gas, such as air, and for venting gas, such as combustion products, from the furnace cavity, and preferably also includes a removable trapezoidally shaped door in a front wall thereof, which, when the chamber door is open, is readily removable from the furnace by hand, without burning the operator's fingers, despite the high internal temperature in the furnace cavity. Air flows through the chamber and around the furnace, helping to cool the exterior, of the furnace walls. It is preferred that the operation of the furnace and the ashing temperature be controlled by a combination of a temperature sensor, preferably a thermocouple, and a control mechanism, which turns the magnetron on and off as the tempera- ture in the furnace cavity falls below or rises above a desired set temperature, respectively. Although the invention relates to a combination microwave apparatus, including an ashing furnace within it, various components of the described apparatuses are considered to be individually novel, unobvious and useful, such as the ashing furnace, with the door structure thereof, and the ashing and analytical processes described also meet such criteria of patentability. - 2 -
613958
Collins Michael J.
Hargett Wyatt P.
Cem Corporation
Fetherstonhaugh & Co.
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