Helium is primarily used to calibrate the dead volume of the sample tube, a technique also known as helium gas quantification. The accuracy of the sample tube's volume directly impacts the reliability of the instrument's test results. Before the introduction of helium gas quantification technology, instrument designers typically relied on manually setting the volume of the sample tube in software. All calculations were based on this fixed value. However, this approach often led to inaccuracies due to several factors:
First, the sample tubes were hand-made, making it challenging to maintain consistent volume across multiple units. This lack of standardization introduced variability into the measurements.
Second, during each test, differences in the material and the amount of sample loaded can alter the effective volume of the sample tube. As a result, the fixed-volume method becomes less reliable under varying conditions.
Third, when testing samples with a small specific surface area, a glass packing column is often installed inside the sample tube. This adds another layer of complexity, as both the sample tube and the column's volume errors can combine, further affecting the final test data.
With the implementation of helium gas quantification technology, the effective volume within the sample tube can now be measured more precisely. This advancement significantly improves the accuracy and consistency of analytical tests, ensuring more reliable and repeatable results. It’s a game-changer for laboratories that require high precision in their measurements.
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