Performance depends on the material, reference method, operating range and installed configuration described in the project.
Practical reference
Permission-state table
| State | Required evidence | Allowed action |
|---|---|---|
| Observe | Valid signal and traceable timestamps | Trend only; no automatic output |
| Advise | Delay and response direction tested | Operator confirms bounded adjustment |
| Supervised auto | Interlocks, limits and fallback witnessed | Automatic output with active oversight |
| Closed loop | Independent validation and approved controller version | Automatic control inside the verified envelope |
| Invalid/degraded | Any required condition missing | Freeze or safe fallback; investigate |
Start with observation
Trend the value with process state, laboratory references and operator actions. Confirm the direction, delay and repeatability of the process response.
Add decision support
Use approved alarms, targets and operator prompts before automatic correction. Record false alarms, manual interventions and conditions where the value is invalid.
Introduce constrained automation
Limit rate and magnitude of water, heat, speed or diversion changes. Block control on fault, empty, transition, maintenance and out-of-range states.
Verify the business outcome
Monitor quality, energy, yield, rework and stability against a defined baseline without attributing every change to the sensor. Review the strategy after material or process changes.
Define permission, limits and rollback
Automatic action requires valid material identity, in-range sensor status, stable process state, tested delay and an approved controller version. Set output rate and total limits, anti-windup or repeated-action protection, alarm ownership, manual fallback and rollback criteria. Measurement availability alone is not permission to close the loop.
Before you act
Engineering checklist
- Measure process delay
- Define valid control states
- Set action constraints
- Provide manual fallback
- Record every override
- Verify quality and process outcome
