Parr Instrument 6400 - Manual (Page 69)

6400
Calorimeter Instruction Manual
9-4
7. Remove the cylinder spacer, 1141DD, which sits on top of the snap ring, 1137DD.
8. Remove the snap ring that retains the cylinder insert in the release mechanism at the
bottom of the air can. Withdraw both the insert and the release pin as a unit using
needle nose pliers.
9. If present, remove any scoring on the 966DD2 release pin, above the smaller o-rings, with
crocus cloth. Replace the 659DDJU o-rings on the release pin as well as the 1138DD o-
ring that seals the cylinder insert. Replace the 659DDJU and 357HCJB o-rings.
10. Reverse the above procedure to reinstall the cylinder insert/pin as well as the bomb
bucket assembly. Make sure that the large side hole in the 1139DD insert is oriented
toward the left side of the instrument. The insert is keyed to the cylinder and can not
be fully inserted unless it is properly oriented
5000 Test Maintenance
To deal with the realities of today’s test loads and cycle times, the ASTM Committee
recommends in method E144-94 that “all seals and other parts that are recommended
by the manufacturer be replaced or renewed after each 5000th firing or a more frequent
interval if the seals or other parts show evidence of deterioration.” Oxygen bombs
returned to Parr for service will be tested in accordance with ASTM E144-94. A test
certificate is provided with each repair.
This service includes:
• Disassembly, cleaning and inspection of all parts
• Re-polishing of the inner surfaces of the bomb
•
Re-assembly with new insulators, and seals, sealing rings, and valve
seats
• Proof testing
•
Hydrostatic testing
The hydrostatic and proof testing of the oxygen bomb should be performed after every
5000 firings or if:
• The bomb has been fired with an excessive charge
•
The ignition of any of the internal components has occurred
•
There have been any changes in the threads on the bomb cylinder
• The bomb has been machined by any source other than Parr Instrument
Company
After repeated use with samples high in chlorine (over 1%), the inner surfaces of the
bomb will become etched to the point where appreciable amounts of metal salts will be
introduced during each combustion. Any bomb which is being used for chlorine
determination should be polished at more frequent intervals to prevent the development
of deep pits. If the interior of the bomb should become etched or severely pitted, the
resistance of the metal to further attack can be improved by restoring the surface to its
original polished condition.
There are no user serviceable parts inside the product other than what is specifically
called out and discussed in this manual. Advanced troubleshooting instructions beyond
the scope of this manual can be obtained by calling Parr Instrument Company in order to
determine which part(s) may be replaced or serviced.