IRREVERSIBLE AND NON-RETURN GAS-FILLED HOT-MELT ELEMENT AND THERMAL INDICATOR CONTAINING IT Russian patent published in 2024 - IPC G01K11/18 G01K11/16 G01K11/06 

FIELD: measuring.

SUBSTANCE: group of inventions relates to an irreversible and irreversible thermal indicator element, which enables to register the fact of exceeding at least one temperature with high speed and accuracy, as well as to a thermal indicator device containing said element. Disclosed is a gas-filled heat-sensitive element with an absorbent material (GHEAM), which is made with the possibility of irreversible colour change when the threshold temperature is exceeded, and includes: opaque for at least part of visible light layer made of gas-filled hot-melt material (GHMM), containing cavities filled with gas phase, as well as a substance or a mixture of substances with a melting point close to the operation temperature of the GHEAM; absorbent material (AM) connected to the GTFM and configured to absorb the molten hot-melt phase of the GHMM. Also disclosed is a thermal indicator device using said element.

EFFECT: improving accuracy and speed of registration of excess of at least one threshold temperature, with preservation of irrevocability of GHEAM appearance, in wide operating conditions, including at vibration loads.

10 cl, 13 dwg, 14 ex