Agilent Community
Agilent Community
  • User
  • Site
  • Search the Community
  • User
  • Home
  • Technical Areas
    Technical Areas
    • AssayMap
    • Atomic Spectroscopy
    • Automated Electrophoresis
    • Bioreagents
    • Cell Analysis
    • Consumables
    • CrossLab Connect
      CrossLab Connect
      • Service Management
      • Smart Alerts
    • Dissolution
    • GC
    • GC/MS
    • LC/MS
    • LC
    • Molecular Spectroscopy
      Molecular Spectroscopy
      • Molecular Spectroscopy - UV-Vis & UV-Vis-NIR, FTIR, Raman & Fluorescence
      • 8700 LDIR User Group
      • Transmission Raman User Group
    • Sample Preparation
    • Software
      Software
      • Chromatography Software
        OpenLab CDS, OpenLab ChemStation, OpenLab EZChrom
      • Data Management Software
        OpenLab ECM, OpenLab ECM XT, OpenLab Server
      • Mass Spectrometry Software
        Data Analysis, Data Acquisition, Productivity App, WalkUp Software
    • Vacuum
  • Applications Areas
    Applications Areas
    • Basic Research
    • Energy and Chemicals
    • Environmental
    • Food and Agriculture
  • Agilent Knowledge Portal
  • Links
    Links
    • Collection of Support Resources
    • Webinar Notifications
    • Contact Support
    • User Contributions
  • Getting Started
    Community Help and Resources
  • Browse
    Browse
    • People
    • Places
    • Your View
    • Your Community Inbox
GC Portal
  • Agilent Knowledge Portal
GC Portal
Articles Replacing the Inlet Septum for Split/Spitless and Multimode Inlets
  • Articles
  • Videos
  • Forum
  • Announcements
  • More
  • Cancel
  • Agilent Knowledge Portal
  • GC Portal Home
  • GC Portal Articles
  • GC Portal Videos
  • More
  • Cancel
  • Created :  10 Nov 2022
  • Modified :  6 Feb 2023
  • Category :  Agilent Knowledge Portal
  • Entry Type :  Article
  • Product Type :  GC Systems
  • Component :  GC Inlets
  • Product Name :  6850 GC System 6890 GC System 7820 GC System 7890 GC System 8860 GC System 8890 GC System Intuvo 9000 GC System
  • Task :  Maintenance
Related Articles
  • Capillary Column Installation Quick Reference Guide

    This Information Applies To: All Agilent Gas Chromatographs, 6890, 6850, 7890, 7820, 8890, and 8860. Issue: A quick reference guide on the capillary column installation for the GC. Inlets Detectors Split/splitless inlet Purged packed inlet Multimode Inlet Cool on Column (COC) Inlet PTV Inlet Volatiles Interface (VI) Inlet FID / NPD TCD - Standard Low Leakage Ferrules TCD - Original Design Column Adapter µECD FPD Steps to follow Warning : The...
  • How to Run and Interpret the Inlet Leak and Restriction Test for the Agilent 7890/8860/8890 GC Systems

    This Information Applies To: Agilent 7890 A/B, 8860 and 8890 GC Systems with Split/Splitless (SSL), Multimode (MMI) or Programmable Temperature Vaporization (PTV) Inlets Issue: The Inlet Leak & Restriction Test is executed after every inlet maintenance procedure. It can also be run for troubleshooting purposes or as a frequent confidence check for GC performance. Useful to Find and repair medium to large leaks. Useful when the inlet will not pressurize to the setpoint due to a large leak...
  • Troubleshooting an FID not Igniting

    This Information Applies To: All GCs, 6890, 6850, 7890, 7820, 8890/8860, Intuvo 9000 Issue: This article is a troubleshooting guide for when the Flame Ionization Detector (FID) does not ignite or the flame keeps going out. Cause: If the FID is having ignition issues, it is due to the following causes: FID temperature : is too low. Lit Offset : is incorrect. FID gas flows : if the air, hydrogen, or makeup gas flows are not correct (or not meeting setpoints). Gas...
  • Inlet Pressure Shutdown / Gas Cannot Achieve Setpoint

    This Information Applies To: Agilent GC systems, focusing on 8890 and 7890A/B, but also applies to 6850A/B, 6890A/N, 7820A, and 8860. Issue: If the inlet pressure / carrier gas flow fail to achieve the setpoint after a few minutes, the inlet pressure will shut down automatically. This article will help you to identify the possible causes of this issue. Steps to follow: Leak at the inlet To detect big leaks in the inlet, perform one of the diagnostic tests for the inlet: Inlet Leak Check...
  • How to replace the Gold Seal on the Split/Splitless (S/SL) Inlet for an Agilent GC

    This Information Applies To: Agilent 6890, 7890, 7820, 8890 and 8860 GC Systems with Split/Splitless (S/SL) inlet Issue Replacement of the Gold Seal is required as part of inlet maintenance. Replacement is required when the performance of the inlet degrades over time due to accumulated contamination (e.g., baseline noise, ghost / artifact peaks, loss of reproducibility, carry over, loss of compound response or no compound response). Items Required The following Gold seals are available...

Replacing the Inlet Septum for Split/Spitless and Multimode Inlets

Answer

This Information Applies To: Agilent Intuvo 9000, 8860, 8890, 7890A/B, 7820A, 6890, 6850 GC Systems with Split/Splitless, or Multimode Inlets.


Issue:

This article describes how to replace the inlet septum for Split/Splitless and multimode inlets for all Agilent GC Systems. Regular replacement of the septum can reduce small leaks in the inlet, allow for more reproducible chromatography, and protect the column from degradation. Replacement intervals should be every 100 to 400 injections depending on the septum part number and can be replaced sooner if experiencing symptoms of a leak. 


Steps To Follow:

Tools Required:

  • Replacement septum
  • Tweezers
  • Gloves
 Warning 
Warning: The oven and/or inlet may be hot enough to cause burns. If the inlet is hot, wear heat-resistant gloves. If possible, set the temperatures to cooler values during maintenance activities
  1. For 8890, 8860, Intuvo 9000 GC systems, in the touchpad, or browser interface, go to  Maintenance > Front (or Back) Inlet > Perform Maintenance. From the checklist, select the Replace Septum check box, then click/press Start Maintenance. Follow the instructions on screen.
    For all other Agilent GC systems, manually reduce the inlet and oven temperatures to below 50 °C. After temperatures are below 50 °C, depressurize the inlet by setting the inlet pressure to zero, then turning off the inlet pressure. This way the inlet will be depressurized safely before turning off the inlet pressure. 
  2. Remove the ALS tower if installed and place it on a mounting pin on the back of the instrument.
  3. Remove the septum retainer nut. (See Figure 1 for full replacement in steps 3 to 8)
  4. Use tweezers to remove the septum from the insert assembly. Do not gouge or scratch the interior of the insert assembly
  5. If septum has needle guide recess in one side, ensure that side is facing up.
  6. Press new septum firmly into insert assembly.
  7. Replace septum retainer nut.
  8. Finger-tighten the septum retainer nut until the C-ring is about 1 mm above the nut. (see Figure 2)


    Figure 1
    : Complete replacement procedure for septum in steps 3 to 8

       


    Figure 2
    : Proper distance between the septum retainer and the C-ring

     Tip 
    Tips: Steps 9 to 11 of this procedure are executed automatically in the Intuvo 9000, 8890 and 8860 GC systems if the septum replacement was performed from the Maintenance section of the touchpad, or browser interface.
  9. Turn on the inlet pressure, and set the pressure value of the analytical method.
  10. Allow the inlet and the column to purge with carrier gas for 15 minutes before heating the inlet or the column.
  11.  Restore the conditions of the analytical method
 Bulb 
Learn how to effectively maintain your Split/Splitless and Multimode Inlet:
GC-7890-2240s - Agilent 7890 Series GC: Preparing for Maintenance and Maintenance Utilities
GC-7890-2245s - Agilent 7890 Series GC: Split/splitless inlet Troubleshooting
GC-8890-2200s - Agilent 8890 GC Maintenance and Troubleshooting e-learning available from Agilent education.
Replacing your septum, liner and O-ring Video on Agilent.com

 

 
Was this helpful?
  • Yes
  • No
Thank you for your feedback!

Agilent Community Feedback

Agilent Community Feedback

×
We are glad this was helpful! We are sorry this was not helpful. If you still need assistance please create a community post or contact support. To help us improve, please provide any additional feedback. For full details of how we will treat your information, please view our privacy policy.
Submit Cancel
Submit Cancel
Contact Agilent Support

Still Need Assistance?

Contact Agilent Support >

Privacy Statement
Terms of Use
Contact Us
Site Help