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MAN.275E.REVC.03112015
Maintenance
CHANGING THE FILTER
CAUTION: THIS PROCEDURE CAN CAUSE SEVERE BURNS. USE PROPER PROTECTION.
Changing the filter in the Model 275E Heated Filter Assembly is extremely easy. Unsecure the door latches and open the
door to the Heated Filter. Close the filter isolation valve(s) to isolation the filter chamber from process. Using gloves to
protect the hand, grasp the cap on the end of the filter body opposite the probe and turn it counter clockwise. The cover
may be hot to the touch and may cause burns to the hand if not protected. Removing the cover also removes the filter.
Inspect the O-Rings which are at each end of the filter to ensure they are still elastic and will seal the filter. Replace them
if they are charred or deformed.
Replace the filter with a new one. Ensure it is in the center of the oven so that it is in contact with the O-Ring on the far
end of the filter.
Screw the cap back on the filter body. Open the filter isolation valve(s). Close the door and secure the door latches. The
filter replacement procedure is complete.
REMOVING THE PROBE TUBE
CAUTION: THIS PROCEDURE CAN CAUSE SEVERE BURNS. USE PROPER PROTECTION.
Removing the probe tube (e.g. for maintenance or inspection) can be done while the process is still running. Shut down
the probe in accordance with shut down instructions. Disconnect the electrical and gas connections to the filter chamber
and isolation valve stack. Remove the subflange retaining bolts holding the primary subflange to the secondary subflange.
Caution:
Parts in the filter stack including the flange and probe tube may be hot. Use proper protection to avoid burns.
Pull the filter stack assembly away from the flange, allowing the probe tube to slide through the probe tube support if
installed.
When the filter stack assembly and probe tube (and probe tube support) are fully withdrawn, close the process side
isolation valve. For the triple O-Ring seal, remove the secondary subflange from the main flange by removing the
remaining subflange retaining bolts. For the retractable probe tube support, disconnect the lanyard and remove the filter
and probe tube assembly. The probe tube may be removed from the filter stack assembly and primary subflange for
maintenance. See the section on installation to reinsert the probe tube and filter assembly into the stack.
