Maintenance and Troubleshooting | 6-45
3. Change the Flow Control to ‘4’ (shut-in/shut-off). Click Apply (next to
Flow Control) and then click OK.
Bleed down the sample system to atmospheric pressure (check gauge).
Close the valve on the Vent Line (or cap the Vent outlet).
To avoid tearing the Membrane Filters in the Filterblock, always bleed
down the sample system pressure on the downstream (outlet) side of
the Filterblock. Pressure differentials of more than 210 KPA (30 PSI)
from the inlet side to the outlet side can tear the Filters and they will
have to be replaced.
4. Disconnect AC power to the analyzer and power down the computer
before performing maintenance on the analyzer.
5. Disconnect the Filterblock tubing. Loosen – but do not remove – the
(2) mounting screws on the Filterblock mounting bracket and remove
the Filterblock.
6. Remove the (6) M6 X 50 screws and carefully separate the Filterblock
into three sections.
Inspect both Membrane Filters for damage, particulate, and liquid
films and then remove them. Remove the Sintered Disks and then the
(2) #006 o-rings from the flat face of the Center and Back Filterblock
sections.
7. Remove the (3) M6 X 20 screws from the Filterblock Core. Remove the
Filterblock Core and inspect the Back Filterblock interior for signs of
particulate or waxy films.
Remove the M6 nut, Seal Washer, o-rings (#115, #010), and the Filter
Cartridge.
8. Remove the Male Connector and Fitting from the bottom of the Filter-
block. Remove the Flow Restrictor (comes with o-ring) from each (3)
housing section. Be careful not to damage the 1/8" NPT threads.
If previous sample gas flow rates suggest possible plugging of the Fil-
terblock Flow Restrictors, replace them with new ones. If there was an
excessive amount of liquid in the first membrane filter stage, replace
the first Flow Restrictor.
NOTE
!
CAUTION
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