Prior to functional testing, which semiannual visual inspections are required for air sampling detectors?

• A. Verify pipe and fittings airtight
• B. Ensure sampling ports are not blocked
• C. Check for clean filters
• D. All of the above

Answer: (D)

Before you run functional tests on an air sampling detector, you want to verify the sampling network is ready to deliver a true sample. If the pipe and fittings aren’t airtight, leaks can alter the flow and pressure in the system, which skews test results and doesn’t reflect how the detector will perform in normal operation. If sampling ports are blocked, the detector won’t receive a representative air sample, leading to inaccurate readings during testing. Clean filters are important too, because a dirty or clogged filter can restrict airflow or contaminate the sample, again affecting test outcomes. When these visual checks are all satisfactory, the functional test will truly reflect the detector’s performance rather than issues in the sampling path. Therefore, all of the above inspections are required prior to functional testing.