GAA610-M
ADVANCED EMISSION GAS MONITORING SYSTEM | OI/GAA610-M-EN REV. B
87
11. Push the distance ring(s) and the Belleville spring in that
order onto the threaded bolt of the new structural
diaphragm.
• The disk edge of the spring must be aligned with the
structural diaphragm.
12. Move the connecting rod
6
to its upper return point.
13. Screw the new structural diaphragm with distance ring(s)
and Belleville spring in a clockwise direction onto the
connecting rod and hand-tighten it.
Replace valve plates (see Figure 52):
14. Separate head cap
1
from the spacer plate
3
.
15. Remove the valve plates 7 and the sealing rings
8
from the
spacer plate
3
.
16. Check that the valve seats, spacer plate and head cap are
clean; if any of them display unevenness, scratches or
corrosion they should be replaced.
17. Insert the new valve plates in the valve seats on the spacer
plate. The valve plates for the compression and suction sides
are identical; the same applies to the upper and lower sides
of the valve plates.
18. Move the valve plates gently in a horizontal plane to ensure
that they are not locked.
19. Insert sealing rings in the spacer plate.
Fit the pump head:
20. Using the fan impeller, move the structural diaphragm to its
upper dead point.
21. Place the spacer plate
3
, the valve plates
7
, sealing rings
8
and the head cap
1
on the casing in accordance with the
markings.
22. Check that the head cap is centered correctly by moving it
gently sideways.
23. Tighten the head cap screws
2
crosswise only slightly.
24. Check that the pump moves freely by turning the fan
impeller.
25. Using the fan impeller, move the structural diaphragm to its
upper dead point.
26. Hand-tighten the head cap screws.
Reinstall diaphragm pumps:
27. Connect pump hoses.
28. Insert mounting plate with the pumps into the sample gas
feed unit’s casing and fasten it with the two hex socket head
screws. Connect electrical connection.
Start the sample gas feed unit again:
29. Turn on main switch.
– The sample gas flow should only be restarted after the
lead time period.
30. Check the seal integrity according to the description in
31. Deactivate the ‘Maintenance Mode’ on the control panel.
