Parr Instrument 6400 - Manual (Page 67)

6400
Calorimeter Instruction Manual
9-2
2. Use a non-metallic object, such as the rounded corner of a plastic credit card,
to simply pry the seal from its groove.
Smaller diameter seals usually require a different approach. A portion of the seal should
be carefully pulled, not pried, from the groove with a small pair of pliers or a hemostat.
The exposed portion of the seal can then be cut, or pulled further to remove the seal.
The pliers or hemostat should never contact the sealing surface, only the seal.
Bomb Removal
To service or remove the bomb cylinder from the bucket assembly, remove the 668DD
Check Valve from the bomb cylinder. Remove the 941DD Wedge with needle nose
pliers. Remove the two SA1632RD18 Machine Screws (see Figure 27), then remove
the 942DD plastic bushings and the 1071DD Quad-ring.
The entire bucket can be removed by disconnecting the bucket probe at the quick
disconnect. Carefully lift the bucket and bomb assembly out of the air chamber and
position horizontally on the calorimeter to remove the 925DD Oxygen Bomb Retainer
Nut (see Figure 23). Now the cylinder can be removed from the bucket assembly. Note
the position of the locating pin.
To replace, follow these steps in reverse.
Fuses
Lines protective fuses rated: Fast-Acting 15A, 250VAC (Parr number 139E23).
The replacement of protective fuses for the 6400 Calorimeter should be performed by
qualified personnel.
Daily Maintenance
Clean the 1444DDJB o-ring that seals the bomb head and cylinder by wiping with a
tissue. Wet this sealing area with water prior to starting a series of tests. Clean the
corresponding sealing area in the cylinder in a similar fashion. Both surfaces must be
free of any accumulated foreign matter, such as unburned sample material or
combustion by-products. Wet the hole in the center of the head which contains the
check valve.
With a tissue, clean the head where the large bucket quad-ring (1071DD) contacts the
head perimeter. Wet this sealing area with water prior to starting a series of tests.
Remove, inspect and clean the cylinder check valve (668DD) and corresponding sealing
area in the bomb cylinder. In extreme cases, i.e. a spilled sample, use soap and water
to clean the area.
Quarterly Maintenance
Change water in the Water Tank and replace the 149C water filters.
Periodic cleaning may be performed on the exterior surfaces of the instrument with a
damp cloth. All power should be disconnected when cleaning the instrument.