6.
GENERAL MAINTENANCE AND ADJUSTMENTS
Page 129
© 2005 - 2007 DH Instruments, a Fluke Company
Reinsert the piston (with cap installed) into the cylinder.
Create a bath of water and mild liquid dishwashing detergent. Distilled water
is acceptable. De-ionized water is best. Detergent must be free of additives
(i.e.,must not contain lotions or softening agents which may leave a residue
after cleaning). To avoid undesired thermal effects, bring the bath to room
temperature.
Holding the piston-cylinder assembly by the outside of the cylinder and the
piston cap, submerge the assembly in the bath. Using a rotating motion,
thoroughly work the detergent into the piston-cylinder assembly.
With the piston-cylinder still assembled, thoroughly rinse the assembly in a
bath of water only. Use the same rotating motion as in the previous step.
Remove the piston from the cylinder and thoroughly dry all areas of the
assembly using a lint free towel. DO NOT touch the critical lapped surfaces
of the piston or the cylinder with anything other than the drying towel. Only
use one side of the towel during this process as the other side will become
contaminated by contact with the operator’s hands. Do not
buff
the
assembly. Just dry it thoroughly.
Reassemble the metrological assembly in reverse order.
If the assembly temperature was elevated during cleaning, it may be
necessary to wait to allow the temperature of the assembly to return to
ambient temperature before the assembly will operate normally.
Glass Cleaner Method
Of the two cleaning methods, the glass cleaner method is quicker and less
demanding but it is less thorough.
DO NOT undertake piston-cylinder module disassembly without familiarizing
yourself with Section 6.6.3.2 of this manual. Incorrect disassembly may
damage or destroy the piston-cylinder.
Disassemble the piston-cylinder module following the instructions given in
Section 6.6.3.2.
If you have not already done so, reinstall the cap on the piston.
Apply a small amount of glass cleaner to a lint free towel. To help ensure
that no residue from the glass cleaner will be left behind, slightly dilute the
cleaner using distilled or de-ionized water. Wipe the lapped surfaces
(polished appearance) of both the piston and cylinder. Do not vigorously
buff
the surfaces.
Using a separate, clean, lint free towel, wipe the surfaces again to remove
any remaining moisture. Do not vigorously
buff
the surfaces.
Reassemble the piston-cylinder assembly in reverse order.
