What is the difference between start-up and commissioning in a new instrument installation?

What is the difference between start-up and commissioning in a new instrument installation?

• A. Start-up is initial powering and basic operation; commissioning includes functional testing, calibration, performance verification, documentation.
• B. Start-up involves calibration; commissioning is only documentation.
• C. Start-up is powering but not operation; commissioning is only to shut down.
• D. Start-up and commissioning are the same.

Answer: (C)

The main idea is that start-up and commissioning serve different stages and goals in bringing a new instrument into service. Start-up is about getting power on and confirming the device can operate at a basic level—essentially the initial run-up to see that the system boots, responds, and can perform simple, basic functions. Commissioning goes a step further: it verifies that the instrument meets its design and performance requirements, which includes functional testing, calibration to appropriate standards, performance verification, and the generation of formal documentation. In other words, start-up proves the device can run; commissioning proves it runs correctly under its intended specifications and is ready for handover. That’s why the best description is that commissioning includes functional testing, calibration, performance verification, and documentation, while start-up covers the initial powering and basic operation. The other options don’t fit because calibration is typically done during commissioning rather than start-up, commissioning is not merely a documentation task, and start-up is not just power without operation while commissioning is not simply a shutdown activity.

The main idea is that start-up and commissioning serve different stages and goals in bringing a new instrument into service. Start-up is about getting power on and confirming the device can operate at a basic level—essentially the initial run-up to see that the system boots, responds, and can perform simple, basic functions. Commissioning goes a step further: it verifies that the instrument meets its design and performance requirements, which includes functional testing, calibration to appropriate standards, performance verification, and the generation of formal documentation. In other words, start-up proves the device can run; commissioning proves it runs correctly under its intended specifications and is ready for handover.

That’s why the best description is that commissioning includes functional testing, calibration, performance verification, and documentation, while start-up covers the initial powering and basic operation. The other options don’t fit because calibration is typically done during commissioning rather than start-up, commissioning is not merely a documentation task, and start-up is not just power without operation while commissioning is not simply a shutdown activity.