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Assembly:
- Apply a small
amount of lubricant to the stem of the burette (5003-25) and level
bottle (5047).
- Immerse the
connection tubing (5052) and the rubber coupling (5046) in hot
water. This softens and expands the tubing making it easier to
slip over the stems of the glassware.
- Connect the
rubber coupling to the center stem of the burette and the other
end of the coupling to the hose nipple (5057) of the Whitey valve
(5055).
- Connect the
connection tubing (5052) to the side stem of the burette and to
the stem of the level bottle.
- Assemble
the burette clamp (5006) around the burette.
- Slide the
stop pin collar w/pin (6014) onto the support rod (5017) at about
the mid-way position of the rod and loosely tighten the collar.
- Place the
burette clamp assembly over the top of the support rod and tighten
in place.
- Adjust the
dial thermometer so that none of the stem is protruding out of
the tip of the piercing needle (6011).
- Lower the
stop pin collar to a position where it just touches the face of
the dial thermometer and tighten in place.
The instrument
is now ready for operation but should first be tested for any gas
leaks that may occur at various connections. This is done by applying
a soapy water solution to the connections while the instrument is
under pressure. The pressurized instrument may also be submerged
under water and any leaks observed. The generally accepted temperature
for gas analysis is 77 degrees F/25 degrees C; therefore , it is
good practice to bring samples to this temperature prior to testing.
WARNING:
CAUSTIC SOLUTION IS USED IN THE OPERATION OF THIS INSTRUMENT. THIS
SOLUTION MAY CAUSE SEVERE BURNS TO THE OPERATOR IF NOT HANDLED WITH
CARE. WEAR GOGGLES AND PROTECTIVE CLOTHING WHILE OPERATING THIS
INSTRUMENT.
Preparation
of Caustic Solution:
A 20% solution
of either Potassium Hydroxide or Sodium Hydroxide is recommended
for air testing. * To make a 20% solution slowly add 100 grams of
Potassium or Sodium Hydroxide crystals to 500 cc's of distilled
water and store in a sealed jar. The Hydroxide solution may also
be purchases from any laboratory or chemical supply company.
*A weaker solution may be used, but the tests will take longer and
fewer tests can be performed.
Operation:
- Close the
White valve (5056),open the burette cock (5005) and put approximately
100 cc's of water in the level bottle (5047), elevating the same
above the burette so as to allow water to run down into the burette
to the bottom of the calibrations.
- Close the
burette cock and lower the level bottle to its stand (5050).
- Place a small
beaker of water under the rubber seal (6013) and lower the cross
bar (6018) so as to submerge the rubber seal in the water. Note:
The cross bar is lowered by depressing the lock plates (5026)
on each side of the cross bar and pushing downwards. When the
lock plates are released, the cross bar will remain firmly locked
in position.
- Open the
Whitey valve (full). This will cause the water to be drawn upward
through the Whitey valve, displacing any trapped air in the system.
Tap amber latex tubing to release trapped air.
- Close the
Whitey valve and remove the beaker from the piercing needle (6011).
- Open the
burette cock and allow the water to return to the level bottle
and discard.
- Replace the
water in the level bottle with caustic solution, filling it approximately
half full.
- Raise the
level bottle to fill the burette completely and close the burette
cock. To prevent overflow, the caustic trap (5079) is furnished
for attachment at the top of the burette. While filling the burette,
check the plastic connection tubing (5052) and work out any air
bottles that may be present.
- Place the
bottle or can to be tested on the base pad (5022) and lower the
cross bar to the point where the rubber seal just touches the
top of the container.
- Depress the
lock plates and push the cross bar rapidly downwards until the
container is pierced.
- Release
the lock plates. The cross bar will remain locked in place with
the rubber seal compressed to prevent leakage at the point of
piercing. Be careful not to trip the lock plates after piercing
as only a slight upward pressure on the lock plates will release
the cross bar.
- Hold the
instrument at the bottom of the base with the right hand while
the left hand holds both the guide rod (5017) and the burette
support rod. Shake the instrument with a rapid back and forth
motion until maximum gauge pressure has been obtained. Note: The
burette is very fragile and may break if it comes in contact with
an object while shaking the instrument. Also, be sure that the
level bottle and stand are located in such a manner that they
do not tip over when shaking the instrument. Record the pressure
for future use.
CO2
Volumes Test:
Note: At this time, if the number of volumes of CO2 gas is desired,
it will be necessary to follow the steps listed below.
- Having recorded
the pressure, insert the dial thermometer (6003) down into the
container to its fullest extent and leave it there until the temperature
remains steady (this may take thirty seconds or longer depending
on the temperature of the product being tested). Now, record the
temperature.
- Having recorded
both the temperature and pressure readings, refer to the correct
temperature/pressure relationships chart included with the instrument
for the volumes of CO2 gas present in the sample being tested.
Air Test:
After the CO2 volumes has been recorded, the "air test" should
be performed as follows:
- Withdraw
the dial thermometer to the thermometer stop.
- Open the
Whitey valve (5056) and allow gas to flow into the burette, reducing
the gauge pressure to 5 psi or less. Shake the instrument a few
times to allow absorption of CO2 gas by the caustic solution.
It is also advisable to invert the instrument and allow the gas
that was released into the burette to be absorbed in the larger
bottom bulb of the burette. The shaking of the instrument allows
for more build up of gas in the test container and for the next
release of gas into the burette.
- Open the
Whitey valve and repeat the above shaking process again. Usually
eight or ten shakes is enough to remove most of the air in the
sample. For very accurate work, however, the operation should
be continued until a constant air reading is obtained. When making
the air reading on the burette, the level bottle should be raised
so as to bring the liquid in the burette and level bottle to the
same level.
- Bleed off
any remaining pressure in the container through the Whitey valve.
- Depress the
lock plates and raise the cross bar to a level that will allow
removal of the container.
NOTE: AIR
READINGS. If air readings tend to increase after a period of testing,
the caustic solution may be diluting and should be replaced with
a fresh solution. The number of tests that can be expected from
the caustic solution will vary according to the strength of the
solution being used.
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