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
A 30-minute logging interval does not blur an excursion, it deletes it. A 17-minute event peaking at 9.64 °C is caught at 1 minute and invisible at 30.
Choosing calibration points
Calibrate where you measure. Points should bracket the use range and include any temperature where a decision is made.
Choosing monitoring locations from mapping results
Permanent sensors go where the mapping found the worst case — the hot spot, the cold spot, the slowest-recovering position — not where the cable reaches.
Sensor response time and why it matters for monitoring
Response time sets how fast a sensor can see a change: seconds for a bare bead, many minutes in glycol or a metal block. Choose it deliberately.
How to choose a temperature data logger for mapping and monitoring
Match resolution and accuracy to the acceptance criteria, check what calibration is offered, then weigh memory, battery, export and response time.
Choosing a liquid calibration bath and its fluid
The fluid sets the range, stirring sets uniformity, depth sets immersion. Ethanol, water, oil and salt each own a range; safety decides the overlaps.