NEW! 2ea Rheodyne 7125-054 Needle Port Cleaner 7125/7725i Sample Injectors chq,, US $240 – Picture 0

NEW! 2ea Rheodyne 7125-054 Needle Port Cleaner 7125/7725i Sample Injectors chq,, US $240 – Picture 1

New! 2ea Rheodyne 7125-054 Needle Port Cleaner 7125/7725i Sample Injectors Chq,

US $240

York, Pennsylvania, United States
Jun 9th

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NEW! 2ea. Rheodyne 7125-054 Needle Port Cleaner for 7125/7725i Sample Injectors PTFE. New-in-Bag Price new from Fisher: $36.62ea. you get 2ea. = $73.34 from Fisher Here is what this is used for: Symptom 4: Carryover (miniature chromatogram) Symptom 4: A miniature chromatogram of the previous sample is produced by injecting a blank. Flush the needle port (see Comments). Load and inject a blank, using the loading method you have been using — partial-filling or complete-filling (see Figure 15). If the peaks are now absent, see Cause A. If the peaks are still present, see Cause B. Cause A The needle port was contaminated with previous sample. It was pushed into the loop when the syringe was inserted during loading. The flushing step has cleaned the port (see Figure 16). Solution If the contamination reappears, make sure you are inserting the syringe properly. You may need to flush the needle port routinely. See Appendix E. Cause B Excess sample from the previous injection was contained in vent tube #6. It siphoned into the loop prior to injection (see Figure 17). If the vent tubes are not properly adjusted, this can occur when in LOAD and the syringe is not in the needle port. Solution Adjust the vent tubes so they are level with the needle port (see Symptom 3). Keep the handle in the INJECT position until the next injection and flush just before returning to LOAD: If the peaks are still present after adjusting the vent tubes, investigate the possibility that the source of carryover is outside of the injector (see Comments). Figure 15. Droplets of sample remaining in the needle port tube and needle seal. These are absent in normal operation. Figure 16. When the syringe is inserted under the conditions shown in Figure 15, droplets of previous sample are pushed into the loop. Figure 17. Previous sample siphons from vent tube #6 into sample loop. Comments To flush the needle port: Use from 0.1 to 1 mL of mobile phase. Use a Needle Port Cleaner (IDEX Health & Science Part Number 7125-054) attached to a luer tip syringe. Flush only when the handle is in INJECT so flow goes directly out vent tube #5 and bypasses the loop. This cleans the entire length of the needle port — guide, tube, and needle seal. The cleaner does this because it seals against the front of the guide. A fully inserted needle flushes none of these parts. If you have no cleaner, use a luer tip syringe. See the illustration in Symptom 5. In routine operation, remove the syringe after turning to INJECT, but keep the handle in this position so the loop is continuously flushed with mobile phase. Flushing after every injection is rarely needed, but, if necessary, do it just before the next analysis. It is usually sufficient to flush after every ten or twenty injections. This keeps liquid in the needle port tube, which baths the syringe needle and dilutes contaminating sample. See Appendix E for more information on when to flush the injector. There are non-injector sources of sample carryover. These include residual sample in the syringe, contamination in the blank solvent, and contamination in the solvent used for flushing. Buy with confidence, buy from a chemist! See: About Me: See: my Other Chromatography Parts/Items! Be sure to add me to your Favorites List! _____________________________________________________________________________ Shipping: USA Any item(s) can be shipped expedited. Please request quote before purchase/bidding. I do not add that as a calculated choice due to the diversity of the items I offer. I strive to ship items using the most cost effective method. This to increase value to my buyers. Whenever possible, I will combine shipping. You Can: Request an invoice if you buy multiple items, or I will refund excess shipping either through Paypal (>$1.00 they suck away $0.30 for the transaction), or discreetly. International Ebay Global Shipping will be used