Gas
Plants
Buyer's
Guide
In nitrogen test stick phosphorous is used in place of copper wire and water in place of Ammonium Chloride solution. Yellow or white phosphorous submerged in water is used for absorbing the oxygen to form phosphorous pent oxide, which is soluble in water. The volume of remaining gas nitrogen is then measured in the burette. A downward graduated burette may be used for easy reading.
Phosphorus is highly combustible when exposed to air so gas cntaining more than 7% of oxygen should not be passed through the phosphorus test set.
Nitrogen Test Procedure
- Crack the Nitrogen purity test valve and open the stop-cock.
- The sample should be allowed to warm to room temperature for
several minutes before the level is adjusted to the zero mark
because nitrogen is colder at room temperature and it expands as ir
warms up.
- Adjust the gas flow and allow the sample gas to bubble through
the purging vessel for one or two minutes.
- Check that the burette, the reaction chamber and the test
connection tube are completely filled with water.
- Turn the stop-cock open to the burette connection.
- Then controlling the flow of nitrogen, slowly open the other
cock to allow the oxygen to pass into the burette.
- When the burette is filled below the bottom mark, close the stop
- cocks .
- Disconnect the nitrogen sample tube , close the test valve.
- Adjust the level of the gas in the burette to the 100 cc mark by
holding the leveling bottle at the level of the water in the
burette.
- Then carefully open both the cocks to bubble through the purging
vessel to atmosphere.
- Level the liquid in the burette and the leveling bottle and note
the reading indicated on the burette scale at the liquid level.
- This reading is equal to percentage of purity of the original Nitrogen sample.
