Resources
For the people who have to produce the paperwork
Practical explainers about chamber and furnace records — what they have to show, how to read one, and the checks that catch a document which looks complete but is not. Written from the reports our software produces rather than from a summary of somebody else's standard.
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How to read a temperature uniformity survey report
What the record has to show, why spread and maximum deviation are not the same number, and the handful of checks that catch a survey which looks complete but is not.
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The documents a pyrometry audit asks for
System accuracy tests, uniformity surveys, instrument calibration — what each record has to contain, how they depend on one another, and the one property that decides whether they still hold up three years later.
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21 CFR Part 11 for chamber data
What the regulation actually asks of chamber records, the line between what software can provide and what only your procedures can, and the three things people most often get wrong — starting with encryption.
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Was the storage condition held? Reading temperature and humidity together
Why "temperature in band 95%, humidity in band 95%" can still mean the condition was barely held, how to measure the combined condition directly, and five checks for any report that claims it.
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Mean kinetic temperature: what it measures, and where it misleads
What MKT actually measures, why it is always at or above the average, and the checks that catch an MKT figure calculated from a record with holes in it.
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Damp heat testing at 85/85: what it is, how it is used, and what to measure
What steady-state damp heat testing does to a product, why 85/85 is run the way it is, how little margin there is before water condenses, and the figures that show a chamber actually held the condition.
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Cyclic damp heat and temperature/humidity cycling: what they test, and what to measure
Why cycling the temperature at high humidity finds failures a steady-state test cannot, what the cold subcycle adds, why the part and the chamber air have to be judged separately, and the figures a cycling record needs.
If there is a record type or a question you would find useful covered here, tell us and we will write that one next.