Do not assume one calibration interval fits every temperature sensor. Base the interval on use risk, manufacturer guidance, applicable requirements and the device's performance history.
What evidence should guide the plan?
Assess the measured range, impact on decisions, frequency of use, operating environment and previous calibration results together. Also check any applicable customer or quality-system requirement.
Fields to match on the certificate. Match device ID, method, measurement points, traceability of the reference standard, as-found and as-left results, uncertainty information, date and laboratory to the device record.
Document the interval decision. Record manufacturer recommendations and the applicable internal procedure; link the selected next date to that rationale. A trend in certificate results can prompt reassessment.
Assess after an event
If impact, repair, water exposure or a failed intermediate check affects a sensor, have its use and related measurement records reviewed under the quality procedure. An authorized person should assess past readings.
An intermediate check can help monitor a device between calibrations; it does not by itself replace a calibration certificate. Define the method and acceptance decision in the procedure.
Linking calibration records to device ID, certificate and the next review decision makes the rationale visible during an audit.