COLORIMETRIC TEMPERATURE SENSOR
First Claim
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1. A chromatic temperature indicator for monitoring the temperature of fluid in a fluid conduit over a predetermined temperature range comprising:
- a layer of colorimetric cholesteric material carried by and in thermal contact with the conduit and having a maximum color-changing temperature range corresponding substantially to the predetermined range, and a protective layer of substantially clear, nonpermeable material over the cholesteric material layer, the protective layer being disposed in a continuous band about the conduit and being formed of a heat-shrinkable plastic.
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Abstract
A chromatic temperature indicator for fluid conduits including a black background layer on the conduit, a colorimetric layer of cholesteric material on the background, a nonpermeable plastic tube heat shrunk over the cholesteric layer and a color reference chart adjacent the cholesteric layer for indicating the color variations thereof and the temperatures corresponding to such variations.
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4 Claims
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1. A chromatic temperature indicator for monitoring the temperature of fluid in a fluid conduit over a predetermined temperature range comprising:
- a layer of colorimetric cholesteric material carried by and in thermal contact with the conduit and having a maximum color-changing temperature range corresponding substantially to the predetermined range, and a protective layer of substantially clear, nonpermeable material over the cholesteric material layer, the protective layer being disposed in a continuous band about the conduit and being formed of a heat-shrinkable plastic.
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2. A chromatic temperature indicator as defined in claim 1 including a reference chart carried by said conduit adjacent the cholesteric material layer and containing elements representing the colors within the color-changing temperature range.
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3. A chromatic temperature indicator as defined in claim 1 including means between the body and the cholesteric material layer and defining a black background layer.
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4. In combination:
- a tubular fluid conduit for conveying fluid the temperature of which is to be monitored over a predetermined range;
a band of material secured to and around the conduit for establishing a black background, a layer of colorimetric cholesteric material on the band and having a maximum color-changing temperature range corresponding to the predetermined range;
a color reference band on the conduit adjacent the layer of cholesteric material and including color reference elements representing colors within the color-changing temperature range and at least approximately the temperatures corresponding thereto, and a protective band of heat-shrinkable nonpermeable plastic disposed at least around the cholesteric material layer.
- a tubular fluid conduit for conveying fluid the temperature of which is to be monitored over a predetermined range;
Specification