What parameters affect the selection of gas chromatographs

1. What is the specific name of the tested sample? (determines the selection of chromatographic column)
2. What standards need to be met? (determines the selection of detector)
3. Do you need peripheral products (computer, air source, vibrator)
4. What is the voltage of the power supply used?
5. What is the gas range? (1. PPM level; 2. Percentage)