For cold injections in gas chromatography, it is sometimes required to inject a sample below ambient temperature. This requirement comes from a need to either enrich the sample, improve recovery of a specific component or prevent its thermal degradation.
As of now, the GC inlet is mostly cooled using liquid nitrogen (LN2) or liquid CO2. In addition to the known safety issues, the use of the cryogenic cooling increases the analysis cost. A high running cost of the inlet cooling can be greatly reduced by replacing the cryogenic system with a Peltier cooler. The cooler is designed for the OPTIC inlet and uses the dry compressed air or nitrogen gas as a cooling media. It is especially attractive in cases when cooling to sub-ambient temperatures is not required.