Does the individual debugging of instruments include offline testing of the instruments?

I’m not quite sure why offline testing of the instruments is needed Generally, the commissioning of control instruments is divided into individual unit commissioning and system-level commissioning. Individual unit commissioning takes place in the instrument testing room prior to installation; it is also known as primary commissioning. Its purpose is to check whether the instruments meet their performance specifications, and to determine if there are any damages, defects, or missing parts resulting from transportation and storage ； It involves debugging and calibration in accordance with the product instructions, **, industry and corporate standards, as well as relevant tuning specifications, all of which are aimed at ensuring that the instruments meet the required quality and performance standards before installation. System commissioning – After installation, this involves the commissioning of the circuit system, also known as secondary commissioning. Its purpose is to check whether all components such as automatic control instruments, pipelines, and wiring are reliable, and to make the necessary adjustments and calibrations to address any deviations in the instrument readings caused by conditions related to location and environment ； The conditions for system commissioning are that the system installation is fully completed, the pipelines have been cleaned and purged, the pressure testing has passed, and the power and gas supplies meet the requirements for the operation of the instruments. If offline debugging constitutes system debugging, then according to the relevant contract terms, it is possible to request the owner to cover additional debugging costs ； Conversely, the costs cannot be increased. For reference!