Critical temperature indicator

Details Critical temperature indicator Critical temperature indicator

G - Physics

01

K

116/67

G01K 11/00 (2006.01) G01K 11/06 (2006.01)

Patent

CA 1204028

Critical Temperature Indicator Abstract A critical temperature indicator (2) is provided utilizing the volume reduction characteristics of organic compounds as they undergo a change from the liquid state to the solid state. The bulb (4) and a portion of the capillary tube (6) of a thermometer-like structure contains a colorless organic compound (10). Another organic compound (12) saturated with a dye, which compound (12) has a solidification temperature lower than that of the colorless compound (10) and which is miscible with the colorless compound (10), is located in the capillary tube (6) and separated from the colorless compound (10) by a solid, movable plug or a liquid (14) which is immiscible with either the colorless or the dyed compound (10,12). The volume of the colorless compound (10) upon solidification is less than the volume of the bulb (4) so that the separating plug or liquid (14) and at least a portion of the dyed compound (12) are drawn into the bulb (4) upon solidification. The dyed compound (12) then mixes with the colorless compound (10) to provide a visual indication that the colorless compound (10) has solidified.

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