Which symptom would indicate a need to check for contamination in the air system after filtration?

Which symptom would indicate a need to check for contamination in the air system after filtration?

• A. Lower downstream pressure after filtration
• B. Higher downstream pressure after filtration
• C. No change in pressure
• D. Increased temperature

Answer: (A)

A pressure drop downstream of the filter signals a restriction after filtration. When contaminants clog the filter element or the downstream path, airflow can’t pass as freely, so the pressure seen after the filter falls below the expected level. This change shows there’s something blocking or contaminating the post-filtration portion of the system and warrants checking the filter, condensate, and downstream lines for contamination or blockage. Higher downstream pressure isn’t a typical sign of contamination, no change in pressure suggests normal flow, and increased temperature isn’t a reliable indicator of post-filtration contamination.

A pressure drop downstream of the filter signals a restriction after filtration. When contaminants clog the filter element or the downstream path, airflow can’t pass as freely, so the pressure seen after the filter falls below the expected level. This change shows there’s something blocking or contaminating the post-filtration portion of the system and warrants checking the filter, condensate, and downstream lines for contamination or blockage. Higher downstream pressure isn’t a typical sign of contamination, no change in pressure suggests normal flow, and increased temperature isn’t a reliable indicator of post-filtration contamination.