If the solution is not changed during a monthly inspection, which requirement is not met?

• A. Flow rate
• B. Solution change
• C. Duration
• D. Inspection frequency

Answer: (B)

Regular replacement of reagents or solutions used in measurement is essential to keep readings accurate. If the inspection shows the solution hasn’t been changed, the requirement to refresh the solution is not met. Over time, reagents can degrade, concentrations can drift, or contamination can occur, all of which distort results and compromise performance. The other aspects—keeping flow within the specified range, ensuring the test runs for the correct duration, and performing inspections on the planned schedule—can still be valid, but the specific obligation to change the solution has been missed.