Abstract: A system for testing the chemical content of a plurality of plastic containers continuously moving along a test line. The system includes a detector maintained at a first vacuum level for sequentially receiving a sample of air from each of the plurality of plastic containers as they move along the test line and for detecting the chemical content of each of the samples. There is a conduit including a first end proximate the plurality of plastic containers and a second, remote end. There is a sensor module interfacing the conduit between its first end and the second ends. There is also a vacuum pump interconnected to the second end of the conduit to maintain the interior of the conduit at a second, lower vacuum level and to establish an airflow rate to sequentially withdraw and transport air samples from the plastic containers to the sensor module.