Eliminating Bubbles, Elevating Precision: Removing dissolved gas via inline degassing

The Litesizer DIA offers fast and accurate particle sizing through dynamic imaging. A high-speed camera captures images at a speed of 220 fps in liquid or dry dispersion.
One of the unique selling points of dynamic imaging is that different types of particles in the same sample or contaminations can be easily identified if they differ in shape. This is possible by filtering through the 20 available size and shape parameters. However, identifying particles of the sample and contaminations becomes more difficult if they are the exact same size and shape. This is the case if a liquid measurement is impacted by gas bubbles in the tank of the dispersion unit.
If we directly compare images from air bubbles and actual sample, we can see that there is hardly any difference.
The influence of dissolved gas can be diminished by stirring the dispersant in the tank extensively before the sample measurement. But this process is difficult to standardize if the amount of dissolved gas is unknown.
The degassing unit is an accessory for the Litesizer DIA and the Litesizer DIF which is mounted on the water line permanently. The system consists of a hydrophobic membrane filter and a vacuum pump.
Dissolved gas is always in equilibrium with the gas phase above the liquid, according to Henrys law. When the gas-phase pressure is lowered by the vacuum pump, the gas diffuses out of the liquid to reach equilibrium again. This diffusion is driven by Fick´s law as the gas bubbles travers through the membrane filter. The vacuum pump continues to shift the concentration away from the equilibrium and thus drives continuous diffusion of gas away from the water source.
CboxQC is an advanced CO₂ and O₂ meter that delivers simultaneous, precise measurement in a wide array of beverages. Its unique measuring principle ensures reliable results, unaffected by other dissolved gases. Dissolved carbon dioxide is measured through the multiple volume expansion technique.
The sample is introduced into a sealed measuring chamber, which is expanded in two controlled steps. CO₂ can be selectively quantified – distinct from O₂ and N₂ – due to its significantly higher solubility, allowing for
accurate CO₂ measurement even in the presence of other gases.
The dissolved oxygen is measured via an optochemical sensor. This works by illuminating a light-sensitive layer that contains fluorescent dye. This enables high accuracy and rapid measurement results.