The document provides instructions for performing a pressure test on a gas analyzer. It instructs the user to select a data set from the main menu, enter any missing port numbers, and ensure the correct calibration gases are selected for the measurement range. It then tells the user to plug the glass bottles into the ports in numerical order without opening them. Finally, it directs the user to select the pressure test option from the main menu, confirm it, and check if the test shows the system is sealed. If not, it advises checking the bottles and vacuum pump valves.