Agilent Technologies 6850 Series II - Page 210

Routine Maintenance: Detectors
Maintaining the flame photometric detector (FPD)
Released: March 2004 6850 Series II GC User Information page 210 of 256
Changing wavelength filters
Install the correct optical filter, depending on the choice of Sulfur or
Phosphorus mode. For Sulfur Mode, use the 393 nanometer filter (part no.
19256-80000). For Phosphorus Mode, use the 525 nanometer filter (part no.
19256-80010).
To change the filter:
Warning Turn off the main power switch located on the left side of the GC. If the
photomultiplier tube is exposed to room light with the power on, it will be
destroyed.
1. Loosen the thumbscrew on the detector cover and lift the cover.
2. Release the retaining spring around the photomultiplier housing.
3. Pull the photomultiplier housing off the detector body. A twisting motion
helps.
4. Remove the old filter. Use tissue to avoid fingerprints.
Cover
PMT housing
Spring
Vent tube