15 Maintaining the FPD+
To Change the FPD+ Wavelength Filter
Maintaining Your GC 249
Do not use cleaning fluids. Cleaning fluids will damage lens coatings.
7 Clean the new filter with lens tissue.
Filters are designed for the light of the flame to pass through in a specific direction. The
triangle (on the edge of the phosphorus filter) and the arrow (on the edge of the sulfur filter)
should face away from the flame and toward the PMT.
8 Install the filter in the filter housing. Install the sulfur filter spacer, if necessary.
9 Replace the PMT assembly and secure with the spring.
10 Route the PMT wires through the clips as shown. Avoid placing the wires very near heated
areas (such as the emission block or oven top).
11 Exit maintenance mode. Select Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Finished.
12 Restore the analytical method.
Sulfur filter
Filter spacer
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