Thermo Scientific Sarasota FD900, User Manual

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5-4
User Guide for Sarasota ID900, FD900, & PD900 Gas Density Meters Thermo Fisher Scientific
Maintenance
Cleaning
Gland Packing
After prolonged use or aging, the gland packing material may become
depressed to the point that it stops sealing correctly. This is apparently
when tightening the gland nut no longer prevents seeping or leaking from
around the gland.
1. The retractor and instrument must be retracted and depressurized
before the gland nut may be unscrewed.
2. Remove the old packing material by inserting a long, thin screwdriver
down into the packing and turning the packing out along the shaft of
the retractor.
Caution
Exercise care when handling the threaded jackscrew as damage
may shorten the life of the gland material and increase the potential for
leaks and nut wear.
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3. Install the new packing by winding it gently around the screw in the
opposite direction to the thread and carefully working the packing
down into the packing area by using a smallscrewdriver.
4. Screw down the gland nut, taking care that the sharp end of the gland
nut does not shear off pieces of packing. Tighten down the gland nut
to 75 Nm (55 lbf.ft) applied to the end of the supplied C wrench.
Cleaning
General
Cleaning may be done with trichloroethylene, genklene, Freon, or a similar
solvent.
1. Remove the density meter from the pipeline. Wipe clean the outside
and carefully remove the circlips holding the inlet and outlet filters.
2. Remove and examine the filter discs and O-rings. Clean in an
ultrasonic solvent cleaner bath or replace with new as necessary.
3. The unit can now be cleaned with a solvent cleaner, preferably in an
ultrasonic bath without removing the spool.