Parr Instrument 6400 - Manual (Page 73)

Maintenance
6400 10
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Fuses
The replacement of protective fuses for the 6400
Calorimeter should be performed by qualified
personnel.
All fuses except Parr part # 139E23 are located on
the A2140E 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.
Part No. 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 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-prod-
ucts. 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 filter. Clean the grill on the heat sink at the
rear of the calorimeter.
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.
50 to 100 Test Maintenance
Replace the heating wire, with 2.5” of 840DD2. Wind
the wire 360 degrees clockwise around screws.
Clean the 986DD Electrode Contact Pins with a
mild abrasive, such as a pencil eraser. Clean the
bomb head electrode points in a similar fashion and
tighten the screws holding the heating wire in place.
500 Test Maintenance
Clean the ignition contacts.
Under normal usage Parr oxygen bombs will give
long service if handled with reasonable care. How-
ever, 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.
For your convenience, these parts may be purchased
as kit number 6038, Firing Maintenance Kit.
Parr recommends that the following parts on the
oxygen bomb head be changed every 500 tests
or six months whichever comes first: 840DD2,
1374HCJV (2), 394HC, 821DD (1), 1071DD, 1444DDJB,
659DD, 519AJV, 694DD. See Figure 14-1 for parts
locations. When reassembling the bomb head, take
care not to roll the 694DD O-ring as this will cause
an oxygen leak.
Note: Samples that contain chlorine or are
abrasive may require this maintenance to be
performed on a more frequent interval such
as every 250 tests.
The 882DD and 969DD O-rings should also be
replaced. See Figures 14-14 and 14-15 for O-ring
locations.