Varian 450-GC, User Manual

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Pulsed Pulsed Flame Flame Photometric Photometric Detector Detector (PFPD) (PFPD) - - Detectors Detectors
Varian, Varian, Inc. Inc. User User Manual Manual 450-GC 450-GC Page: Page: 357 357
Typically, graphite ferrule Typically, graphite ferrules cont s cont ain sulfur ain sulfur as a contamina as a contaminant. If you us nt. If you us e e
graphite ferrule graphite ferrules, expe s, expect a higher background ct a higher background during pre-conditioning during pre-conditioning of of
the chromatographic column. The background may be particularly high the chromatographic column. The background may be particularly high
when using a new graphite ferrule that has not been used and
when using a new graphite ferrule that has not been used and
conditi
conditi oned in the pa oned in the past. st.
3. 3. Hold the Hold the column securely between column securely between the thumb the thumb and and forefinger of one forefinger of one hand. hand.
Use the scoring tool to score the column once lightly about 1 to 2 cm from Use the scoring tool to score the column once lightly about 1 to 2 cm from
the end of the column.
the end of the column.
4. 4. With your th With your thumbs and umbs and forefingers, g forefingers, grasp the co rasp the column on lumn on each side each side of the of the
score and bend the column carefully away from the score and bend the column carefully away from the score mark until it score mark until it
breaks at the score mark. breaks at the score mark.
5. 5. Examine th Examine the cut with e cut with the magn the magnifying lens ifying lens to decide to decide whether the whether the column was column was
properly cut (Item 4) or improperly cut (Item 5). properly cut (Item 4) or improperly cut (Item 5).
If you observe small splinters of silica or bits of the If you observe small splinters of silica or bits of the outer coating on the outer coating on the
column end, repeat the above procedure and make a fresh cut. column end, repeat the above procedure and make a fresh cut.
If you observe a clean cut, you may use either of 2 techniques to install the If you observe a clean cut, you may use either of 2 techniques to install the
column. If you wish
column. If you wish to visually confirm the position of the to visually confirm the position of the column end above column end above
the combustor support, go to the combustor support, go to Disassemble the PFPD, below Disassemble the PFPD, below . If you would . If you would
rather not disassemble the detector, see rather not disassemble the detector, see Page Page 360 360 ,, Insert the Column Insert the Column ..
Disassemble the PFPD Disassemble the PFPD
Refer Refer to to on page 344 on page 344 . .
These tools are needed to complete the following procedure: These tools are needed to complete the following procedure:
••
Phillips-head Phillips-head screwdriver. screwdriver.
••
9/64" 9/64" Allen Allen wrench. wrench.
••
Metal Metal forceps. forceps.
••
Teflon Teflon combustor combustor extraction extraction device. device.
••
Teflon Teflon tweezers. tweezers.
••
Lab Lab tissues. tissues.