Glossary · definition
OOS (Out of Specification)
A result that falls outside the established acceptance criteria or specification limits and requires a documented investigation.
See also:OOT (Out of Trend)Temperature excursion
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Articles on OOS
Choosing sampling interval and study duration
Short enough to see events, long enough to include the cycles that matter — and consistent across all sensors.
Choosing calibration points
Calibrate where you measure. Points should bracket the use range and include any temperature where a decision is made.
Selecting a reference thermometer
The reference sets the floor of your uncertainty. Choose it for stability and a calibration uncertainty comfortably below what you need to deliver.
Choosing monitoring locations from mapping results
Permanent monitoring sensors go where the mapping showed the worst case — the hot spot, the cold spot and the slowest-recovering position — not where the cable is shortest.
Sensor response time and why it matters for monitoring
A sensor's response time sets how fast it can see a change. Bare-bead sensors respond in seconds; sensors in glycol or metal blocks in many minutes. Choose deliberately.
How to choose a temperature data logger for mapping and monitoring
Match resolution and accuracy to the acceptance criteria, check the calibration offer, and look at memory, battery, export format and response time before price.