All oxygen analyzers will be different. Most of them will come with their own user manuals, and people should read those before they even consider getting started in most cases. Reading the user manual should prepare people for most of the remaining steps. The basic format of oxygen analyzers should not be overly different for most people, so some of the processes will transfer if people have learned how to operate one oxygen analyzer.
Most oxygen analyzers are battery-powered. The batteries might be sold separately. They might also be included in the package with the rest of the oxygen analyzer parts. People will need to start by inserting the battery into the correct location. Often times, this is a compartment that is positioned in the bottom section of the device.