Parr Instrument 6300 - Manual (Page 45)

M
AINTENANCE
& T
ROUBLESHOOTING
6300
9
w w w . p a r r i n s t . c o m 45
C
HAPTER
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M
AINTENANCE
&
T
ROUBLESHOOTING
R
OUTINE
M
AINTENANCE
Note:
See the corresponding water system manuals for informa-
tion on the maintenance of those systems.
To service or remove the bomb cylinder from the bucket
assembly, remove the 941DD Wedge with needle nose
pliers. Remove the 668DD Check Valve from the bomb
cylinder. Remove the two SA1632RD18 Machine
Screws (see Figure F-20). Then remove the 942DD
Bushings and the 1081DD Quad-ring.
Carefully lift the bucket and bomb assembly out of the
air chamber and position horizontally on the calorim-
eter to remove the 925DD Oxygen Bomb Retainer Nut
(see Figure F-19). 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
The replacement of protective fuses for the 6300
Calorimeter should be performed by qualified
personnel.
All fuses except Parr part # 139E23 are located on
the A2140E I/O board located inside the instrument.
Contact Parr Customer Service for instructions on how
to access the fuses.
Note:
Check the labels on the instrument for correct fuse rating.
Parr
Part #
Description Type Ratings
139E23 Lines Protective
Fuses Fast-Acting 15 Amps,
250Vac
1641E2 Heater Fuse (F2) Fast-Acting 2.5 Amps,
250VAC
1641E Pump Fuse (F1) Fast-Acting 1 Amp,
250VAC
997E5 Bomb Rinse (F5) Slo-Blo 5 Amps,
250VAC
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
corresponding sealing area in 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 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.
50 to 100 Tests
Replace the heating wire, with 2.5” of 840DD2 360
degrees clockwise around screws. Clean 986DD
Electrode Contact Pins with mild abrasive, such as a
pencil eraser, clean bomb head electrode points in a
similar fashion, tighten screws holding heating wire in
place.
Quarterly
Change water in the Water Tank and replace the
1245DD and 149C water filters.
500 Tests
Under normal usage Parr oxygen bombs will give long
service if handled with reasonable care. However, the
user must remember that these bombs are continually
subjected to high temperatures and pressures which
apply heavy stresses to the sealing mechanism. The
mechanical condition of the bomb must therefore be
watched carefully and any parts that show signs of
weakness or deterioration should be replaced before
they fail.
Parr recommends that the following parts on the
oxygen bomb be changed every 500 tests or six months
whichever comes first: 840DD2, 1374HCJV (2),
394HC, 821DD (2), 1071DD, 1444DDJB, 659DD,
519AJV, 694DD. When reassembling the bomb head,
take care not to roll the 694DD O-ring as this will cause
an oxygen leak. Samples that contain chlorine or are