Environmental Technician Certification (ETC)

What is the purpose of isokinetic sampling during stack emissions testing?

To ensure the sample gas is cooled to a standard temperature before measurement To match the sampling velocity to the stack gas velocity so representative particulate samples are collected To neutralize acidic gases before they contact the sampling filter To maintain a constant flow rate through the sample pump regardless of stack pressure

Correct Answer:

To match the sampling velocity to the stack gas velocity so representative particulate samples are collected

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