50 Model 5380 PFPD Operator’s Manual
Rev. 3.1
9. Verify that the column positioning tool is resting on the combustor support by
slowly pulling the column down. If the column positioning tool does not
move, the column positioning tool is positioned correctly. If the column
positioning tool moves, slowly pull the column down until the column
positioning tool no longer moves. When the positioning tool stops moving, it
is resting on the combustor support.
10. The column positioning tool has five grooves that are 0.5 mm (0.020") apart.
Use the grooves to judge proper placement of the column. Gently move the
column up into the detector until the column positioning tool moves up one to
two grooves (0.5–1.0 mm).
Note: For optimal performance, the column must be 0.5–1.0 mm above the
combustor support (Figure 4.14).
11. While holding the column in the proper position, tighten the column nut. The
column will likely move slightly upwards when the column nut is tightened.
Observe whether or not the insertion tool moves and adjust accordingly. Often
it is only required to move the tool up 0.5 mm (one groove); the tightening of
the column nut will move the column the remaining distance.
12. Gently remove the column positioning tool, and place it in a clean bag for
later use.
Installing the Combustor and Reassembling the PFPD
Two sizes of combustors and combustor supports are available. For sulfur and
selenium detection, use a 2-mm combustor. Use a 3-mm combustor for detecting
other elements. However, the 3-mm combustor should be used for sulfur analysis
when the column flow rate is above 4 mL/min, to reduce the sufur quenching that
is caused by a large flux of co-eluting hydrocarbons, or when sufur is detected
simultaneously with other elements that need to be optimized.
Column Positioning Tool
Detector Body
Figure 4.15. Proper Placement of the Column Positioning Tool
Combustor Sleeve
(combustor support is
located under the sleeve)
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