Where they are used
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The industrial metal sheathed Type K thermocouples are available by special order.
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They are not as long-lasting as our standard 8 gauge thermocouple when it is protected by the industrial mullite protection tube.
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However, they do offer greater sensitivity to temperature change and so may be appropriate in applications that are below about 2200°F and require sensitivity (glass is a good example).
Technical details
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L&L provides these thermocouples with a 1/4” diameter sheath. These will last longer than the smaller 1/8” diameter thermocouples that some manufacturers use. We use a high-quality ceramic terminal block on the end. They are 6-1/2" long.
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From our own extensive testing, we found that this particular metal sheathing performed best of the available materials on the market under repeated Cone 10 firings.