A gas chromatograph is often used for separating and analyzing different compounds. In this application, a high resolution MPV regulates the pressure of the carrier gas going to the sample valve. The sample valve injects a specific amount of aerosolized sample into the column tube. The valve shuts off, allowing the constant-ﬂow carrier gas to send the sample through the length of the column tube.
The sample can have several chemical substances, each traveling through the gas chromatograph’s column at diﬀerent rates and exiting at diﬀerent times. In this example, the detector is only looking for the diﬀerence between pure carrier gas and non-carrier compounds. The different rates and exit times help researchers determine what non-carrier compounds are present. Better separation of chemicals may be achieved by precisely changing the carrier pressure with the MPV. This may be essential for bioanalysis of bodily fluids or to monitor and detect drugs or impurities.