What additional ion mobility separation (IMS) gases are supported on SYNAPT G2-Si? - WKB16622

ENVIRONMENT

• SYNAPT G2-Si
• SYNAPT G2-S

ANSWER

In all cases the gas purity must be at least 99.5%. 

ADDITIONAL INFORMATION

• Some gases may require specialized regulators or special handling or safety considerations.

• Standard instrument performance specifications require nitrogen, and this gas is still required for the installation, performance testing, and service work on the instrument.

• Some gases, such as nitrogen oxide (NO), can linger within the instrument when switched back to nitrogen gas. Such gases can be "sticky" in a vacuum system and can take a long time to come off metal surfaces.

• The pressure gauge in the IMS cell is calibrated for nitrogen. The exact gas composition at the gauge head is unknown, so the gauge should not be considered a true pressure.

• The IMS mass flow controller (MFC) is calibrated for nitrogen. When switching to other gases, different amounts of gas will be flowing (a higher volume for noble gases, a lower volume for CO2, SF6). The turbo pumps should not be affected if the IMS MFC is left at 90 mL min-1; alternatively, it can be adjusted to actually deliver 90 mL min-1 using an appropriate mass flow correction factor (see the table below).