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Portable Gas Chromatograph Description
Your first step is to determine the appropriate detector for your testing needs. Your KWIPPED network supplier can help you make this decision and choose the appropriate injector. Other decisions regarding the data display and storage are also important.
Features of portable gas chromatographs
The main features of a GC unit are the injector, helium or nitrogen source, separation column, detector, and a display screen. There are a variety of injector types, some split the stream to provide a test sample, others take continuous or intervallic samples. There are many detector types as well; they are named after the process of separation and measurement. A few examples and the compounds they detect are as follows:
Barrier discharge ionization detector (BID) – all compounds except Ne and He
Electron capture detector (ECD) – electrophilic compounds
Flame photometric detector (FPD) – organic sulfur and phosphorus compounds like residual pesticides and malodorous compounds
Flame thermionic detector (FTD) – organic nitrogen and phosphorus compounds like residual pesticides
Thermal conductivity detector (TCD) – all compounds
How portable gas chromatographs work
A sample is injected into the GC and enters a gas stream. This gas is usually helium or nitrogen. The gas mixture is transferred to a separation tube where the components are separated and a detector measures them. This data is displayed on a screen or sent to a computer for further analysis. The method of separation and detection varies depending on the type of detector being used with the GC.
About portable gas chromatographs
Chromatography is a method of separating and analyzing compounds. Gas chromatographs (GC) inject a sample into a gas to carry it through the chromatography process. There are many types of injectors and detectors available on GCs.