ISA Certified Automation Professional (CAP) program

The correct answer is D, “justification analysis.” In an instrument commissioning testing matrix, activities are listed that are involved in the verification that the instrument installation is properly received and installed according to the specifications. First, a receipt verification is performed to verify that the instrument received is the correct item, including vendor, model number, size, and process connection type.

The item is then typically bench calibrated and installed in the process according to the piping and instrumentation drawings and installation drawings, including loop drawings. When construction is complete, loop checks are performed. During initial startup, loop tuning is performed, and all instrument readings are verified for consistency and reasonableness. Any deviating instruments may be recalibrated in the field.

Justification analysis was not included in the above discussion. Justification is typically performed during the feasibility phase of a project, or in the case of late scope additions, before purchase in the detailed design phase.

Reference: Trevathan, Vernon L., A Guide to the Automation Body of Knowledge, Second Edition, ISA, 2006.