13 Maintaining the FPD+
To Change the FPD+ Wavelength Filter
210 Maintaining Your GC
5 To prevent light from damaging the PMT, cap the end or place it face down.
6 Place a clean cloth under the filter housing to catch the filter.
• For phosphorus filter, use the sharpened wooden tip of a toothpick or cotton swab to
dislodge the filter from the housing.
• For sulfur filter (shown below), use the wooden tip of the cotton swab to remove the
filter spacer. Then dislodge the filter from the housing.
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.
Sulfur filter
Filter spacer
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