Procedure To Replace Mesh Filter - Siemens Maxum II Service Manual

4.2.1

Procedure to Replace Mesh Filter

1. Shut off the detector Hydrogen and allow the detector to cool down. Carrier gas should
remain on during cool down to prevent condensation.
2. Turn off all supply gasses.
3. Power off the analyzer.
4. Remove Cap Screws (19) and detach Upper Detector Body (16) from Lower Detector Body
(3).
5. Unscrew Burner Nut (10) and remove the Quartz Jet and attached hardware (7, 8, 9, 10,
and 11). Set these items aside on a clean, lint free cloth.
6. Using a small flat-head screwdriver or similar tool, remove the Small and Large Retainer
Clips (5 and 6).
7. Turn on the air supply to the FID in order push the Mesh Filter (4) up so that it can be
removed.
If turning on the air supply does not dislodge the Mesh Filter (4), use a flat screwdriver to
carefully pry up the Filter (be careful not to scratch the surface of the FID body.
8. Turn off the FID combustion air.
9. Discard the old Mesh Filter (4) and install a new one in the FID.
10.Re-install the Small and Large Retainer Clips (5 and 6)
11.Re-insert the Quartz Jet and attached hardware (7, 8, 9, 10, and 11) into the FID Bottom
Body (3). Verify that the nozzle tip of the Quartz Jet (11) is still adjusted correctly (there
should be 10.5 mm from the nozzle tip to the Lower Body (3).
12.Tighten the Burner Nut (10) with fingers. Then retighten one quarter to one half rotation
using a wrench. The nozzle can break if it is tightened more.
13.Replace the graphite seal (12) before reassembling the FID body.
14.Reattach Upper Body (16) and Lower Body (3) and reinstall Cap Screws (19). Tighten Cap
screws firmly but do not over tighten (about 1/2 turn past finger tight).
15.Power the analyzer back on.
16.After the oven and FID has had time to heat up, check the flows and light the flame.
Maxum Edition II Detectors
Service Manual, May 2018, A5E42019847001
WARNING
Possible ignition source. Failure to follow proper safety procedures may result in injury or
death.
If the analyzer is equipped with a purged methanator and explosive gasses are present,
it is necessary to wait at least 8 minutes for the methanator to cool after powering down
the analyzer before opening the analyzer door.
CAUTION
Possible ignition source. Failure to follow proper safety procedures may result in injury or
death.
Do not open the FID with the flame burning or with the power on.
Flame Ionization Detector
4.2 Replacing the FID Mesh Filter
35