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Process
Temperature Control Rings (PTCR) from 850°C up to 1750°C
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| PTCR: What it is | |||||
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The PTCR ring is a highly accurate ceramic temperature indicator which
records the true heat treatment received by the fired product. PTCR rings
take account of both radiated and transferred heat, as well as the effects
of temperature over time. lt conveniently allows this recorded heat exposure
to be expressed as a single number - ring temperature (RT) - which is
practical and easy to work with. PTCR rings can be used in both batch and continuous kilns & furnaces; they are used in a range of atmospheres including oxygen, nitrogen, air and vacuum. Five different PTCR types are available - standard height is 7.0 mm (3,5 mm also available) - covering a range from 850 to 1,750°C. Ring types are identified by color coding and batch and type numbers pressed into the ring. |
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| PTCR: How it works | |||||
| When exposed to heat in the kiln & furnace, the PTCR ring contracts - and continues contracting as the top temperature is maintained over the time. The degree of contraction is almost linear over the complete operating range of the PTCR, providing a practical measure of the accumulated heat to which the ring - and the fired products - have been subjected. The amount of contraction - the amount by which the ring diameter has shrunk - is measured with a numerical or digital micrometer. This measurement can be converted to 'ring temperature' for ease of comparison and correlation to the firing process (temperature tables are supplied with the rings). | |||||
| Available range of PTCR-Rings: | |||||
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Temperature
range
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Type
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Colour
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...850 - 1.100°C
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PTCR
- ETH
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light
green
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...970
- 1.250°C
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PTCR
- LTH
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pink
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1.130
- 1.400°C
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PTCR
- STH
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green
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1.340
- 1.520°C
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PTCR
- MTH
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yellow
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1.450
- 1.750°C
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PTCR
- HTH
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white
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PTCR
ring dimension: outer diam. 20 mm, inner diam. 10 mm, height 7 mm
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