Irreversible Warmup Indicator.
Abstract
The application describes a device for indicating irreversibly by means of color change that temperatures equal to or above 7 C, 10 C, or 13 C have occurred. A container which has an orifice therein is filled with a liquid which freezes at the temperature to be monitored. A dye is dissolved in the liquid. The orifice is placed in proximity to an indicating paper. When the container is activated by freezing, any increase in temperature after activation causes the liquid to melt, expand and escape through the orifice contacting the indicating paper thereby dying the paper and producing an irreversible signal.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 10, 1976
- Accession Number
- ADD003779
Entities
People
- Frank E. Swindells
- Mary G. Klimas
Organizations
- United States Department of the Army