SYSE.19:5 - Worked Case: A Changed Sensor-Calibration MethodDescription

A pump-controller project used edition E2 of a sensor-calibration MethodDescription. E2 states that temperature compensation for sensor module TS-2 is valid from -20 °C to 50 °C. The supplier publishes E3 under the same edition scheme. E3 narrows ordinary validity to -10 °C through 50 °C; lower-temperature use now requires a new calibration Method and evidence.

The source-impact team has authority to classify engineering reliance but not to release controller units. It compares the two claim-bearing epistemes and finds four candidate uses of the old temperature claim:

1. the thermal model uses it as a cold-start parameter bound;
2. the cold-start test MethodDescription uses it as an acceptance condition;
3. the safety claim uses evidence produced under that condition; and
4. the interface architecture description cites E2 only in its bibliography.

Inspection gives the first three uses depends and the bibliography citation mentions only. The interface decision and room-temperature evidence therefore remain usable. The cold-start model, test criterion, and service- release premise enter the affected reach.

In this constructed case, qualified planning premises show that the modeling, calibration and chamber-test results can arrive before the release decision and that their combined burden is warranted by the cold-start release question. The team chooses three revalidation Work occurrences. A modeling Agent revises the cold-start model. A calibration Agent performs the new low-temperature calibration for units S006–S008. A test Agent performs the chamber test under the current hardware, interface, sensor, and firmware configuration. Each Work occurrence has its own Method, result, and evidence.

The returned evidence supports cold-start use for S006–S008 under the tested conditions. Units S009 and S010 still lack calibration evidence. Units S001–S004 use another hardware configuration, so this changed claim does not reach their release premise.

The bounded source-change impact decision now:

• preserves the interface decision and room-temperature evidence;
• supersedes the old cold-start model parameter and test criterion for current use;
• preserves cold-start release eligibility for S006–S008 under the new evidence;
• reopens the release premise for S009 and S010; and
• supplies the result to SYSE.14, where the authorized Agent makes the service-release decision.

Carrier-only countercase. The supplier republishes the same E3 episteme at another URL with a new PDF layout. The publication and carrier facts change; claim content, applicability, access and direct use stay compatible. Updating the reference completes this change. No affected-use search, new engineering decision record or common revalidation summary is needed.

World-change boundary. Replacing an actual TS-2 sensor is a configuration and world-side engineering change. Use SYSE.13 and SYSE.14 for that change.