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Detector temperature considerations
The FPD flame produces considerable water
vapor. The detector must be operated above
120°C to prevent condensation.
Unnecessarily high temperatures can cause ther-
mal decomposition of many thermally labile phos-
phorus and sulfur compounds.
Detector temperature can have a significant
effect on sulfur sensitivity. If analyzing
compounds with high boiling points, the detector
temperature should be set to 25°C above the
final oven temperature—if allowed by the temper-
ature limit of 250°C.
Released: April 2004
Flame ignition problems
NOTE: The flame is easier to light at higher detector
temperatures.
If the flame doesn't light at all, be sure the glow
plug circuit is working. Try to ignite the flame
while watching the visual display. If the display
does not momentarily go to greater than 65500
counts, the glow plug is either damaged or not
receiving power. Check the pin connections at
the printed circuit board, the lead connection on
the glow plug and the appropriate 5A fuse on the
GC main circuit board. If the glow plug has failed,
replace it.
6850 Series Gas Chromatograph Service Procedures
317
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