GERSTEL Olfactory Detection Port

The GERSTEL Olfactory Detector Port ODP allows the sensing of compounds by the human nose as they elute from the column of a gas chromatograph. The effluent is split as it leaves the column so that it arrives simultaneously at the nose and at another detector such as a mass spectrometer.

The ODP has its own heating and humidification system to provide optimum conditions for detecting and identifying compounds of interest in complex mixtures. ODP 3 Image.pngThe ODP can be installed in most gas chromatographs and includes a separate pneumatics module to control make-up gas and humidification flows. A GRAPHPACK® precision engineered flow splitter ensures zero dead volume, and leak free operation even if exposed to many temperature cycles. This provides reproducible retention times with no cross contamination.

There are two different versions ODP:

  • The ODP 2 is used for most olfactory applications where the compounds of interest are typically very volatile.
  • The ODP 3 is used for applications where the compounds of interest cover a wider boiling point range. It provides this extended range through the use of an auxillary heater at the tip of the column.

When used with the Agilent Technologies 7890 or 6890 GCs, a completely integrated voice recognition software package is available. The software provides a detailed “olfactogram” that includes odor intensity, retention time and voice comments for compounds as they elute. All data is stored with the ChemStation method and can be presented in a number of different ways (chromatogram/olfactogram overlap, method report with descriptors, etc.) to help with data interpretation and problem solving.