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8.4 QDT+ filter maintenance
Service
Change the QDT+ filter element yearly or every 4000 hours, whichever comes first. Its
pressure drop will not increase during its useful life. Nevertheless, the adsorption element
must be changed earlier at the first signs of oil vapour and odour.
Procedure
1.
Isolate the filters from the air net.
2.
Depressurize the QDT+ filter by means of the U+ filter drain.
3.
Uncouple the pipe at the inlet with the flange.
4.
Unscrew the head.
5.
Remove the spring and the perforated plate.
6.
Remove the filter bag(s).
7.
Clean the extrusion and heads with a dry clean cloth.
8.
Place a new filter bag inside the extrusion. The label “This side up” must be at the top of the
bag.
9.
Replace the o-ring in the head (and between the heads).
10.
Reposition the perforated plate and spring.
11.
Screw the head completely on the extrusion.
12.
Torque the bolts with 40 Nm.
13.
Connect the head and flange at the inlet of the filter. Replace the o-ring between the flange
and the head.
14.
Slowly pressurize the filters.
15.
Check for leaks.
A small amount of water based lubricant (supplied in the cleaning kit) may be applied to screw
threads and
o-rings to facilitate the assembly.
Traceability
The catalyst and activated carbon bags are labeled with production date, batch number and part
number.
Warning
To ensure that the unit always produces pharmacopoeia compliant air, only dedicated and
genuine spare parts must be used.
The installation and maintenance must be done by trained and certified personnel.
Note
When replacing the activated carbon and catalyst, make sure that the activated carbon
and catalyst are disposed of according to the local regulations.
Summary of Contents for dMED 025
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