This document introduces a high-pressure liquid injection device that can be used for high precision and accuracy measurements of highly volatile liquefied hydrocarbons in gas chromatographs. The device consists of a needle interface and a liquid rotary valve, and can be used to sample light petroleum matrices with broad boiling point distributions.
The document details a unique sample injection device based on a needle interface and liquid rotary valve, designed for sampling light petroleum matrices with broad boiling point distributions. The system consists of a 4-port liquid sampling valve, a Siltek deactivated needle, and is installed directly over a split/splitless inlet on the Agilent 7890A or 6890 Series Gas Chromatograph. The unit is operated automatically similar to a typical liquid autosampler, though the needle is not withdrawn during the process.
| Maximum sample pressure limit | 5,000 psig |
|---|---|
| Sample size | 0.5-uL (0.2 pL for C5-C40) |
| Valve temperature limit | 75 °C |
| Injection port temperature | 250 °C (350 °C for C5-C40) |
| Injection time | 2- to 3-second |
The maximum limit of sample pressure is 5,000 psig.
A 2- to 3-second injection time should be used.