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tuyere
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I don't mean, literally, how do you use them, I mean- what sort of systems you have, when you choose to use them, what you're looking for, what brand/type you use, etc?
We use Ferro PTCR rings, but I recently realized they don't work how we thought they did, i.e. the number you get from the diameter table is not indicating temperature, but rather a unitless heat-applied-over-time thermal-work number with no direct temperature correlation. So I'm re-evaluating how we use them, or if we should be buying a different product if it's temperature we actually want to check.
A suggested PTCR firing program is +120C an hour, 1 hour hold, at 1500 degrees. But the manufacturer's literature doesn't make clear that that will approximate a real temperature measurement. I think it sort of implies it, but the wording is unclear. They're clear that, in general, the 'heat number' you get is not a temperature measurement, so... i dunno. Orton Ceramics sells a couple other products that are explicitly for temperature verification vs. heat work quantification, maybe we could go with those for occasional temp calibrations, and keep using PTCR rings to compare our furnaces and make sure their performance isn't fluctuating.
We use Ferro PTCR rings, but I recently realized they don't work how we thought they did, i.e. the number you get from the diameter table is not indicating temperature, but rather a unitless heat-applied-over-time thermal-work number with no direct temperature correlation. So I'm re-evaluating how we use them, or if we should be buying a different product if it's temperature we actually want to check.
A suggested PTCR firing program is +120C an hour, 1 hour hold, at 1500 degrees. But the manufacturer's literature doesn't make clear that that will approximate a real temperature measurement. I think it sort of implies it, but the wording is unclear. They're clear that, in general, the 'heat number' you get is not a temperature measurement, so... i dunno. Orton Ceramics sells a couple other products that are explicitly for temperature verification vs. heat work quantification, maybe we could go with those for occasional temp calibrations, and keep using PTCR rings to compare our furnaces and make sure their performance isn't fluctuating.