Carbometers - Carbonation Analyzer
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There are a number of methods for detecting the quantity of gas contained in a liquid.
The Maselli Carbonation Analyzer uses a system based on Henry's Law which says that if a liquid with added gas contained in a closed vessel is subjected to a certain amount of energy (either mechanical stress or electrical shock), part of the added gas will began to escape causing the pressure to rise until a pressure level is reached ("saturation" or "equilibrium pressure") in which the gas no longer escapes. The equilibrium pressure is a function of the concentration of the dissolved gas and, therefore, by measuring the pressure and temperature when this condition is reached, the concentration of the gas per unit of volume of the liquid can be found.

The unit is programmed to perform these phases of analysis:

  • sampling
  • vacuum
  • stripping
  • readings (pressure - temperature)
  • washing

In the first three phases, a sample is taken, part of which is isolated in the chamber where a vacuum is created and the sample is subjected to stress to cause the gas to escape. The pressure of the freed gas increases asymptotically until equilibrium is reached. Using algorithms based on Henry's Law, measuring pressure and temperature during this phase will give the concentration of dissolved gas.