GC - Catalog

59The On-column Injector is supplied with carrier gas from the included Electronic Pressure Controller (EPC), and thecarrier gas is conveniently filtered with an internally mounted Molecular Sieve filter which can be baked out simplyby flipping a switch on the GC’s front control panel.Asecond EPC is available for operating a column connected toa gas sampling valve (or for backflushing) without the injector fitting. Also available is a second injector fittingconnected to the first EPC for applications where two columns are used in parallel, sharing the same carrier gaspressure.On-Column Injector? Simple and Reproducible? For Liquids and Gases with Low AND High Boiling Analytes? For 0.53mm Capillary and 1/8” Packed Columns? No Boiling Point Discrimination? Low thermal massFor most applications, where a wide-bore 0.53mm capillaryor 1/8” packed column is used, the On-column Injector willgive the BEST results. In most cases the On-ColumnInjector is simpler and less expensive than heated injectors.The On-Column Injector is supplied as standard equipmentwith the 8610, 410 and 310 GC mainframes.GC InjectorsThe injector’s low thermal mass and small size ensure that the syringeneedle deposits the liquid sample well inside the column oven, so that asthe column temperature increases, even high boiling point samples arecompletely vaporized. The On-column technique of sample introductionputs the sample into the bore of the column itself, which is often more inertthan a glass injection liner. Unlike split/splitless injection, on-column injectionputs the entire sample volume into the column without the possibility ofboiling point discrimination or other uncertainties, and the gradualvolatilization of the sample starting from a liquid droplet yields sharperpeaks than flash vaporization followed by recondensation.The On-Column Injector’slow mass and small sizeensure that the injector bodytemperature closely followsthe column oven temperature.The On-Column Injector is perfect forliquids and gases with high and low boilinganalytes. Even very high temperatureanalyses are easily performed using simple,reproducible on-column injection.8690-0023 On-Column Injector for 0.53mm capillary and1/8” packed columns. Includes EPC carriergas controller and molecular sieve filter8690-2022 Second carrier gas EPC without injector portfitting8690-2023 Second injector port fitting without EPC