THERMAL COUPLE MEASURING TOOL (TCMT)
Original Publication Date: 2000-Nov-01
Included in the Prior Art Database: 2004-Jan-16
Sony Technical Digest
The purpose of the Thermal Couple Measuring Tool (TCMT) is to insure that the Thermal Couple (TC) of a five inch diffusion tempress furnace is positioned exactly eight inches from the wall of the rear entry to the front of the coupler (fig. 1). The tool was invented with the goal of it being an effective way to measure the furnace thermal couple during routine pre-flights of equipment. The temptress furnaces in diffusion are horizontally set and are stacked four-high. It is patently difficult for operators to reach and measure TC accurately, as they are instructed to use a small plastic 3M marker that is taped to the side wall of the rear furnace entry that indicates the specified eight inch distance. This method is ineffective because there are several furnaces (A 1, A2, 8 1, 82, C 1, Dl, D2, El, and E2) which are above six feet from the ground. The furnaces above six feet from the ground are cluttered at the base with nitride or poly lines and other equipment that impede a clear measurement of TC; there is no room to stand or place a stepping stool near these furnaces.