Parr Instrument 6400 - Manual (Page 14)

1
Installation
P a r r I n s t r u m e n t C o m p a n y 12
Gas Connection
Make the connections to the oxygen supply at this
time. Refer to Figure 1-3. 1/8” O.D. nylon pressure
hose (HX0012TB024) is used to connect the oxygen
supply. The inlet connection incorporates a flow
restrictor just behind the inlet connection. When
making the oxygen connection, a back-up wrench
should be placed on the restrictor to insure a secure
connection and to prevent over tightening the flow
restrictor. The delivery pressure for oxygen should
be set to 450 psig. To install the regulator, unscrew
the protecting cap from the tank and inspect the
threads on the tank outlet to be sure they are clean
and in good condition. Place the ball end of the
regulator in the tank outlet and draw up the union
nut tightly, keeping the gages tilted slightly back
from an upright position. Open the tank valve and
check for leaks. The bomb must never be filled to
more than 600 psig (40 atm).
Make the connections to the nitrogen supply at this
time. 1/4” O.D. nylon pressure hose (HJ0025TB035)
is used to connect the A812DD Nitrogen Regulator
to the 1576 Rinse Tank. When making the nitrogen
connection, a back-up wrench should be placed on
the fitting to insure a secure connection and to pre-
vent over tightening the flow restrictor. The delivery
pressure for nitrogen should be set at 80 psig. To
install the regulator, unscrew the protecting cap
from the tank and inspect the threads on the tank
outlet to be sure they are clean and in good condi-
tion. Place the ball end of the regulator in the tank
outlet and draw up the union nut tightly, keeping the
gages tilted slightly back from an upright position.
Open the tank valve and check for leaks.
Note: A hissing sound will occur while the
rinse tank is being pressurized. This is nor-
mal. Adjust the pneumatic supply regulator
to 80 psig as needed.
During extended periods of inactivity, close the tank
valve to prevent depleting the tank in the event of
a leak. Close the tank valve prior to removing the
regulator when changing tanks. Do not use oil or
combustible lubricants in connection with any part
of the oxygen filling system. Keep all threads, fit-
tings and gaskets clean and in good condition.
Note: To release the pressure inside the rinse
tank turn off the gas supply and open the gas
relief valve lever. Gas will exhaust through
the relief valve. Once the pressure has equal-
ized remove the lid to refill the rinse tank.
Bomb Exhaust Connections
The exhaust and vent connections at the rear of the
calorimeter, are made with the dual tube A1006DD
assembly. The end of the assembly with the bomb
exhaust diffuser should be placed into the 10 liter
carboy (231C2). The carboy should be placed at or
below the level of the calorimeter to facilitate com-
plete draining of these lines.
Alternatively:
The A1050DD Bomb Rinse Container Assembly is
available as an accessory to the 6400 Calorimeter.
See Figure 14-19. This device allows for complete
and systematic recovery of the bomb combustion
products. These combustion products include the
initial line exhaust after the fill cycle and the por-
tion expelled during the bomb rinse cycle. The
Bomb Rinse Container Assembly is connected to
the rear of the calorimeter, in place of the portion
of the waste tube assembly that is connected to the
bomb exhaust fitting. Combustion products are
discharged from the bomb in two steps. The first
step occurs during the initial rapid release of the
residual bomb gases. The 1053DD bottle has suf-
ficient strength and volume to deal effectively with
this sudden pressure release. Gas is expelled from
the four holes on the perimeter of the 1052DD bottle
cap, leaving any discharged liquid in the bottle. As
an additional safety measure, the bottle is supported
in a 1054DD acrylic cylinder which serves to keep
the bottle upright and contained in the unlikely
event the bottle ruptures. At the end of the bomb
exhaust step the aqueous combustion products
reside in the bomb, associated tubing as well as the
1053DD bottle. The bomb rinse step flushes these
combustion products from the bomb and the tubing
into the 1053DD bottle. The bottle can then be
unscrewed from the assembly and capped, until the
sample is to be analyzed. Some users find it useful
to add the contents of the rinsed combustion cap-
sule to the washings collected in the bottle. Three
1053DD bottles are provided with the assembly.
Additional bottles may be ordered separately from
Parr.