Equipment, Qualification, and Calibration
This domain tests equipment design, qualification stages, calibration and maintenance, and the investigation of measurement failures. It rewards candidates who can separate qualification from validation, and calibration from verification.
Design and qualification
- 211.63 requires equipment of appropriate design, size and location for its intended use, cleaning and maintenance. 211.65 requires product-contact surfaces to be non-reactive, non-additive and non-absorptive, with no contact from lubricants or coolants.
- The qualification chain is DQ, IQ, OQ, PQ. Design qualification confirms the specification against the user requirement; installation qualification confirms it is installed as designed with correct utilities, drawings and documentation; operational qualification challenges it across its operating ranges; performance qualification shows reproducible performance in the actual production environment with product and trained operators.
- Traceability must run from user requirement to functional specification to design specification to test scripts, so no requirement is left untested.
- 211.67 requires written cleaning and maintenance procedures on a schedule, with records. 211.68 requires automatic, mechanical and electronic equipment to be routinely calibrated, inspected and checked, computer systems to be validated, and backup and error-checking provisions.
- 211.72 prohibits asbestos-containing filters and requires a non-fibre-releasing filter after any fibre-releasing filter.
Calibration
- Calibration compares an instrument's indication against a reference standard of known accuracy, traceable to a national or international metrology institute such as NIST.
- Intervals are set from criticality, historical performance and manufacturer recommendations; critical instruments may also be checked before and after use.
- Verification confirms suitability without adjustment; it is not a substitute for calibration.
- An out-of-tolerance result triggers removal from service, notification of the quality unit, identification of the last successful calibration, an impact assessment on every batch and analysis produced since then, a root cause, and a decision on the validity of those results. Repair and recalibration alone do not close it.
Worked example
A balance used for weighing assay standards fails its quarterly check, reading 0.850 g against a 1.000 g standard. The correct response is to remove it from service, quarantine it, identify the last successful calibration, list all batches and laboratory results generated in the interval, assess the direction and magnitude of bias against specification, re-test or reject affected work, document the conclusion, and only return the balance to service after repair, recalibration and a verification or qualification step. Simply adjusting the balance and continuing is a critical failure.
Traps that cost marks
- Claiming equipment qualification validates the process; process validation is separate and uses production batches.
- Failing to assess the impact of a calibration failure on already released batches.
- Accepting a vendor calibration certificate without demonstrable traceability.
- Confusing calibration, verification and preventive maintenance, or omitting 211.68 requirements for computerised systems and backup.