A new sensor can change the data without changing the weather
An ageing temperature sensor is replaced with a newer model. The readings shift slightly. Is the city warmer, or does the new instrument behave differently? Replacement validation protects continuity and interpretation.
Define the required performance
The new device should be suitable for the monitoring purpose, environmental conditions and relevant accuracy needs.
Verify installation and identity
Record model, serial number, location, mounting height, shielding and configuration.
Compare measurements appropriately
Where feasible, overlapping observations or reference comparisons can help identify differences between old and new instruments.
Check timestamps and data flow
Confirm reporting intervals, units, metadata and integration with downstream systems.
Document the transition
Preserve replacement dates, reasons, calibration information and any limitations affecting historical comparisons.
Monitor early performance
Initial checks may not reveal every problem. Review the new sensor under relevant conditions after deployment.
Break-test: a replacement sensor reports in Fahrenheit while the system expects Celsius
Can validation detect the mismatch before the data enter public dashboards?
Connected knowledge
See Sensor Decommissioning Controls, Sensor Reference Comparisons and NEA.