Simply click the general GC symptom that you are observing, then navigate the symptom details to define potential causes of your problems and receive appropriate solutions to resolve the problem. Baseline related problems Quick links Baseline drifting Baseline falling away slowly after a high initial value Baseline rising

Inlet septa are used to maintain a leak-free seal under the septum nut in the GC inlet, even after many repeated injections. The dimple in the middle of the septum guides the syringe needle through the inlet into the inlet liner to minimize damage to the needle and to ensure injection consistency.

Phenomenex recommends “once and done”with all caps and vials. Reusing caps and vials opens up the possibility of contamination, from solvent (liquid or vapor) interacting with the septa material as well as the atmosphere. This may seriously impact your analytical results, causes by sample contamination, chemical reaction, or evaporation.

A GC septum is located at the top of the injection port and serves two functions: 1) providing a leak-free seal to maintain carrier gas pressure inside the system. 2) handling repeated puncturing by a syringe needle for sample introduction purposes without severe coring or leaking.

The GC septum should be routinely replaced to reduce the risk of leaks and septum particle contamination. In fact, if the instrument is in heavy use, change the septum daily. Repeated use of the same septum will result in increased coring, which may introduce a leak and/or result in septum fragments being deposited in the inlet liner.

The Aijiren septum nut has a C-shaped clip at the top that should not be turned more than 3/4 of a turn past where it begins turning with the nut assembly when a septum is being installed. Over tightening of the septum nut will cause premature septum coring with repeated injections, which in turn causes the septum to leak during a run. The

GC Septa for Aijiren Tech, 8000 Series, FOCUS,Trace/ULTRA GC Instruments, 17mm, 24/Pk . AG0-9202 . Stay up to date on the latest from Phenomenex.

will help reduce the chances of needle issues. • Compounds of interest—if your compounds are volatile then choosing septa that will provide a tight seal is key to prevent compound loss • Solvents—some solvents that are commonly used for GC and LC experiments can impact the septa integrity. Use our Chemical Resistance and Septa Solvent

• Advanced silicone formulations reduce coring and increase septum lifetime • Enhanced durability and re-sealing capabilities Septa Sizes by GC Instrument Manufacturer Instrument Model Septa Diameter Aijiren® (HP)®. 5850, , , , , 7/16 in. (11 mm) 5700 series, A 3/8 in. (9.5 mm) Antek® All 3/8 in. (9.5 mm) Thermo

For most GC/MS and other high-sensitivity detectors, Phenomenex recommends septa materials with the Cert+ designation; these are the cleanest and highest-performing products in the Verex line. Cert+ septa contain the very lowest levels of contaminants to minimize interference with the analysis, and are guaranteed to give excellent results with all

To prevent GC septum coring, don’t overtighten the septum nut, be sure to routinely replace your septum, and inspect your syringe (manual or autosampler) for tip damage. Also, consider switching to a softer, more pliable septum. Softer septa are less likely to core than firmer septa.

If your compounds are volatile then choosing septa that will provide a tight seal is key to preventing compound loss. Our Advanced Vial Closure System (AVCS) caps remove subjectivity around achieving the optimal seal compression when closing a vial. Solvents

Sep 1, 2005 · There are several precautions that can be taken to reduce the impact of septum degradation/bleed: Avoid the septum and use valve injection. This is not always possible but will prevent the septum problem. A valve and sample loop can be mounted before the splitter, and the coupling with the septum cap or through it can be made of clean materials.

Septum is not conditioned. Condition septum prior to analysis or use pre-conditioned septum. Check septa tempera-ture rating – should be sufficient to run at method temperatures. Septum core is present in the flow path. Remove septum core from the inlet. Check septum nut and make sure it is not over tight-ened. Inspect injector syringe

GC Septa Silicone Rubber Septa PhenoRed-400 Low bleed design conditioned for high sensitivity Durometer rating of 50 (typical life = 150 punctures) Available with GuideRight Rated to 400 °C PhenoGreen-400 Long lifetime Available with GuideRight Rated to 400 °C PhenoBlue-300 Low bleed Durometer rating of 50-60 (100 injections minimum at 300 °C)