Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter
Patent
1997-01-31
1998-08-18
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
Composite temperature-related paramenter
374160, 374102, 374142, 116217, 116220, 116266, 368 11, 73714, 73731, G01K 1106, G01K 304, G01K 1300, G01L 710
Patent
active
057950652
ABSTRACT:
A temperature-time-pressure detecting device for a closed heat treatment zone consists of a sealed discoidal-shaped capsule of substantially transparent material adapted for placement within the zone in a generally vertical position. The capsule is formed of two opposed preferably symmetrical circular shell walls sealed around their common rim and defining therebetween a central core region containing a shaped mass of a fusible indicating material having a defined melting point at least as high as the temperature to be detected. The central core region is surrounded by an inner and an outer annular chamber which are concentric with the core region and with one another. Separating the inner chamber from the core region is a spacer ring maintaining the shell walls fixedly spaced apart, the ring being penetrated at preferably uniformly circumferentially spaced points by radial ports for the passage of fused indicating material at a rate such that migration of the fused material to the inner chamber occurs over a time interval generally corresponding to the time to be detected. For detecting a desired pressure, the shell walls of the inner chamber slope inwardly to converge into mutual contact to form a closure normally separating the inner from the outer chamber. Pressure of a selected magnitude applied to the capsule walls causes the central core walls to deflect inwardly resulting in the application of leverage, with the spaced ring as fulcrum, to the converging inner chamber walls to force the same apart to open the closure and allow fused material to pass into the outer chamber.
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Daniel William J.
Gutierrez Diego F. F.
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