HERACLES e-nose is based on fast gas chromatography with 2 metal columns. The stability of these columns has been followed up over 3 years at Alpha MOS laboratory. This was achieved by conducting the recommended weekly diagnostic with a mixture of alkanes ranging from n-hexane (C6) to n-hexadecane (C16) and recording all the analysis results.
The diagnostic analysis was performed on a set of columns MXT-5 and MXT-1701, delivered in standard with the instrument. During this 3-year period, around 30 000 assays of more than 100 types of products have been conducted one these 2 columns.
The results showed an excellent stability with a very low drift of retention times (between 0.5% and 2% for the heaviest compounds).
Several technical features explain this outstanding stability: