Orsat gas analyser

Although largely replaced by instrumental techniques, the Orsat remains a reliable method of measurement and is relatively simple to use.

The intake and each of the absorption pipettes are valved with stopcocks to allow the movement of gas through the apparatus to be precisely controlled.

The leveling bottle can be lifted and lowered to enable readings to be taken at constant pressure and to transfer the gas to and from the pipettes containing the different absorption media.

The gas is then passed into the Potassium Hydroxide (caustic potash) burette by opening the stop cock and lifting the leveling flask.

The same technique is repeated for oxygen, using the pyrogallol, and carbon monoxide using the ammoniacal cuprous chloride though depending on any additional absorption media the process may be different.