Temperature history indicator

Details Temperature history indicator Temperature history indicator

1992-03-16

1993-04-13

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

420 16, 420 17, G01K 738

Patent

active

052015831

ABSTRACT:
A temperature history indicator for a boiler tube or other thing can take the form of a clip fixed around the tube or thing. The indicator is made of a ferrite-containing duplex stainless steel non-structural piece of alloy having at least about 63 weight % of iron, 23-27% chromium, 5-11% nickel, and the balance comprising other components no one of which exceeds 2.0%. Preferably, the balance of the alloy includes any one or more of 0.005-0.009% carbon, 0.3-0.8% silicon, 1.0-2.0% manganese, 0.002-0.006% phosphorous, 0.003-0.007% sulphur, 0-0.02% molybdenum, and 0-0.02% copper. The thing is associated beforehand with the alloy in such a way as to irreversibly alter its magnetic properties and after exposure to temperature, the time and/or temperature are deduced by the loss in magnetic permeability.

REFERENCES:
patent: 2350329 (1944-06-01), Hornfeck
patent: 3126492 (1964-03-01), Swoboda
patent: 3969109 (1976-07-01), Tanczyn
patent: 4533259 (1985-08-01), Wakahara
patent: 4537517 (1985-08-01), Inomata et al.
patent: 5096304 (1992-03-01), Lai et al.
Kimmel, E., "Use of Temperature-Sensitive Materials for Process Control," Industrial Heating (Mar. 1984).
"Templug" Sales Literature, Shell Marketing Limited Industrial Division, London, England (no date).
Kimmel, E., "Fusible Temperature-Indicating Materials," Electronic Packaging and Production (Oct. 1980).

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