What will all sample pipes be terminated by?

• A. A filter assembly
• B. A valve
• C. A pressure gauge
• D. A sample bottle

Answer: (A)

The end of every sample line is protected by a filter assembly to keep the sample clean and protect the sampling equipment. The filter traps particulates, condensate, and any potential contaminants that could alter the gas reading, clog the line, or damage pumps and analyzers. While a valve, pressure gauge, or sample bottle all play important roles in the sampling process, they don’t serve the protective, contaminant-blocking function at the termination point that a filter provides.