Orsat apparatus is a very convenient apparatus for analysing the flue gas on the spot asnd by proper handling gives accuracy upto +- 0.5% of the CO2 content. Many types of this apparatus for analysing the volumetric composition of a mixture of gases are available . In its simplest form the apparatus is arranged for determining the volumetric composition of the flue gases containing CO2, CO, O2 and N2 by difference . Fig showws a three bulb Orsat apparatus . A is a water jacketed eudiometer graduated upto 100 cc. The base of the eudiometer is connected by a fle4xible rubber pipe to an aspirator bottle B. purpose of the aspirator bottle is to charge or discharge the eudiometer.
The flasks 1.2.3 with duplicate flasks behind them contain respectively the solutions of caustic potash ( KOH) ( one paret of KOH to 2 part of water by weight) for absorbing CO2. alkaline solution of pyrogalic acid ( 5 grams of pyrogalic acid in 15 cc of water mixed with 120 grams of KOH in 80 cc of water) for absorbing O2 and Cuprous Chloride ( CuO dissolved in twenty times its weight of concentrated HCl acid with copper wire immersed till it becomes colorless for absorbing CO.
In order to accelerate absorbtion of the gases in flasks 1 2 3 they are packed with small glass tubes.wetted surfaces of the glass tubes are bare by raising the aspirator bottle and opening the cock communicating with a particular flask. The gas sample is introduced in the flask and is protected from reaction with atmosphere by a film of oil.
Testing procedure
To start with it is to be ensured the the chemicals reagents in the flasks are freshly prepared water is filled in the Eudiometer jacket Salt water is filled in the Aspirator Bottle B .
Three Way Cock D is opened to the atmosphere and the aspirator bottle is raised to fill the eudiometer
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