Varian 450-GC, User Manual

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Detectors – Pulsed Flame Photometric Detector (PFPD) Detectors – Pulsed Flame Photometric Detector (PFPD)
Page: Page: 362 362 User User Manual Manual 450-GC 450-GC Varian, Varian, Inc. Inc.
1. 1. Use the Use the clean metal clean metal forceps to forceps to place a place a new bottom new bottom aluminum crunch aluminum crunch
washer (Item 14) on the washer (Item 14) on the detector base. detector base.
2. 2. Hold the Hold the PMT assemb PMT assembly (Item 2) wi ly (Item 2) with one h th one hand an and and the de d the detector tower tector tower with with
the other. Sight the top the other. Sight the top of the combustor support (Item 8) through the of the combustor support (Item 8) through the
detector tower. Keep the combustor support centered as you lower the detector tower. Keep the combustor support centered as you lower the
detector tower (Item 4) over
detector tower (Item 4) over the support. the support.
Be very ca Be very careful not to reful not to crush the end of the column. crush the end of the column.
3. 3. Reinstall the Reinstall the 2 Allen 2 Allen screws (Item 16 screws (Item 16) that hold ) that hold the detecto the detector tower to th r tower to the e
detector base (Item 6). Tighten the screws detector base (Item 6). Tighten the screws alternately. alternately. Note: If installing the Note: If installing the
column with the aid of the column depth gauge, follow instructions column with the aid of the column depth gauge, follow instructions on page on page
360 360 ..
4. 4. Use the Use the Teflon co Teflon combustor mbustor extraction d extraction device (of evice (of the correct the correct taper) to taper) to insert insert
the quartz combustor (Item 5). the quartz combustor (Item 5).
5. 5. Use the Use the clean metal clean metal forceps to forceps to place a place a new top new top aluminum crunch aluminum crunch washer washer
(Item 13) on the (Item 13) on the detector tower. detector tower.
6. 6. Replace th Replace the igniter ca e igniter cap (Item 3) p (Item 3) on the d on the detector tower. etector tower. Use the 9 Use the 9/64" Allen /64" Allen
wrench to reinstall in the top of the igniter cap the 2 Allen screws (Item wrench to reinstall in the top of the igniter cap the 2 Allen screws (Item 15) 15)
that secure the igniter cap to that secure the igniter cap to the detector tower. the detector tower.
7. 7. Reinstall Reinstall the De the Detector co tector cover on ver on the top the top of the of the GC. GC.
8. 8. Turn on Turn on the PFPD e the PFPD electronics an lectronics and PFPD Ove d PFPD Oven Power. Be n Power. Be sure that sure that the the
detector gases are turned on. The detector may not begin pulsing normally detector gases are turned on. The detector may not begin pulsing normally
until the detector tower has begun to heat
until the detector tower has begun to heat up somewhat. Allow the detector up somewhat. Allow the detector
to come to temperature and equilibrate for at least to come to temperature and equilibrate for at least 15 minutes. During this 15 minutes. During this
equilibration period the polyimide coating on the portion of the column equilibration period the polyimide coating on the portion of the column
exposed to the flame is burned off,
exposed to the flame is burned off, leaving a clean fused silica surface. leaving a clean fused silica surface.
9. 9. Did you Did you install a install a quartz co quartz combustor with mbustor with a differen a different diame t diameter? ter?
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If If Yes Yes , go to , go to Optimizing the PFPD Optimizing the PFPD for instructions on for instructions on optimizing the optimizing the
performance of the PFPD with the quartz performance of the PFPD with the quartz combustor just installed. combustor just installed.
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If If No No , the PFPD is ready for operation. , the PFPD is ready for operation.