DVLS Liquefied Gas Injector

One of our innovations is the Liquefied Gas Injector: a fast, safe and accurate solution for the analysis of oily residue in liquefied gases. The technique is standardized in the ASTM D7756 and EN 16423 methods for the analysis of residue in LPG. Watch the video for an explanation of the system configuration followed by a demonstration of the Liquefied Gas Injector.

Sampling and analysis of liquefied gases

The direct injection approach of the Liquefied Gas Injector includes the proven fuel direct injection technique used by the automotive industry to inject fuel into the automotive engine combustion chamber. The LGI uses a standard GC injector needle, which is inserted into a GC large volume on-column injection system. Solenoid activation transfers the pressurized sample through the needle directly on-column. A sliding device moves the needle downwards for the injection and upwards for purging.

To allow a representative sample injection a Pressure Station is used to keep the sample in a liquid phase during the injection. The sample cylinder is installed using quick connectors. For liquid samples the Pressure Station adds high pressure Nitrogen to the sample cylinder and controls the outlet pressure and flow. Optionally the Pressure Station can also be configured for gas samples by including a vaporizer to control the sample evaporation after injection. The waste sample is vented to a central waste system to ensure laboratory safety.

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