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 Mass

The On-column injector's low mass and small size ensure that the injector body temperature closely follows the column oven temperature.
The On-column injector is perfect for liquids and gases with high and low boiling analytes. Even very high temperature anaylses are easily performed using simple, reproducible on-column injection.
On-column injector
The On-column injector's low thermal mass and small size ensure that the syringe needle deposits the liquid sample well inside the column oven, so that as the column temperature increases, even high boiling point samples are completely vaporized. The On-column technique of sample introduction puts the sample into the bore of the column itself, which is often more inert than a glass injection liner. Unlike split/splitless injection, on-column injection puts the entire sample volume into the column without the possibility of boiling point discrimination or other uncertainties, and the gradual volatilization of the sample starting from a liquid droplet yields sharper peaks than flash vaporization followed by re-condensation.

The On-column injector is supplied with carrier gas from the included Electronic Pressure Controller (EPC), and the carrier gas is conveniently filtered with an internally mounted Molecular Sieve filter which can be baked out simply by flipping a switch on the GC's front control panel. A second EPC is available for operating a column connected to a gas sampling valve (or for backflushing) without the injector fitting. Also available is a second injector fitting connected to the first EPC for applications where two columns are used in parallel, sharing the same carrier gas pressure.


Product number:
8690-0023 On-Column Injector for 0.53mm capillary and 1/8 packed columns. Includes EPC carrier gas controller and molecular sieve filter
8690-2022 Second carrier gas EPC without injector port fitting
8690-2023 Second injector port fitting without EPC