Parr Instrument 6400 - Manual (Page 11)

6400
Calorimeter Instruction Manual
2-5
Note:
A hissing sound will occur while the rinse tank is being pressurized. This
is normal. 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, fittings and gaskets clean and in good
condition.
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 complete draining of these lines.
Alternatively:
The A1050DD Bomb Rinse Container Assembly is provided as an accessory to the 6400
Calorimeter. See Figure 28. 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 portion 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
sufficient 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 capsule to the washings collected in the bottle. Three 1053DD
bottles are provided with the assembly. Additional bottles may be ordered separately
from Parr.
Communication Connections
There are three RS-232 serial ports at the rear of the calorimeter. These ports are
designated Terminal, Printer and Balance. The pin-out of these three ports are identical
and can be found in Table 1.