• Created : 
  • Modified : 
  • Category :  Agilent Knowledge Portal
  • Entry Type :  Article
  • Product Type :  Atomic Absorption Systems
  • Component :  Atomic Absorption Instruments
  • Product Name :  240FS AA 280FS AA 55B AA
  • Task :  Maintenance
Related Articles

  • Removing and Replacing GTA Furnace Electrodes

    This Information Applies To: Agilent GTA 120, 240/280 GTA Furnace Issue Over time, the electrodes may become pitted or eroded and users may see a decrease in precision or begin to experience the "Tube fault" error when new tubes are installed. If any of these instances occur, the electrodes should be replaced. Requirements Replace electrodes in pairs. Single electrode replacements are not recommended. Always remove the electrode on the right first, then the left electrode. Always...

  • Replacing the GTA Shroud

    This Information Applies To: Agilent GTA 120, 240/280 GTA Furnace Issue The shroud should be replaced annually, or when there is evidence of damage caused by mechanical shock or contamination from liquid spillage. Items Required Shroud Removal Tool (p/n 9910033300 ) Warning : Always switch off the unit, disconnect the power supply cable, and allow enough time for the workhead to cool down to a safe handling temperature. Steps to Follow Remove the GTA Furnace...

  • Installing a Graphite Tube

    This Information Applies To: Agilent GTA 120 and Zeeman Atomic Absorption instruments Issue How to replace and align graphite tubes. Replacement of graphite tubes are a routine maintenance item for all Graphite Furnace instruments. Items Required Graphite tubes suitable for your application. Tube options include: Partitioned tubes, pyrolytically coated, 10/pk (p/n 6310001200 ) Omega platform tubes, pyrolytically coated, 10/pk (p/n 6310003700 ) Plateau tubes, pyrolytically coated...

  • General Maintenance for the Agilent Flame and Graphite Furnace Atomic Absorption Systems

    This Information Applies To: Agilent Atomic Absorption Spectroscopy Systems (240/280 Series Flame AA and 240/280Z/Zeeman/GTA 120 Graphite Furnace) Issue: This article includes recommended maintenance procedures to be performed daily, weekly or annually to ensure optimum performance of the Agilent atomic absorption systems. Steps to follow: Schedule of recommended maintenance procedures: Daily Check that the exhaust system has positive extraction Check the gas supplies Check...

  • Removing the GTA Furnace Workhead

    This Information Applies To: Agilent GTA Furnace and Flame Instruments, Agilent 240FS/240GFAA/GTA120/PSD120 Issue There may be occasions when users need to remove GTA furnace center block workhead (instruments with both Flame and Furnace capabilities) from the sample compartment. Steps to Follow Warning : Hot Surface. Parts of the furnace become hot during use. To prevent burns, always allow the furnace to cool completely before touching. Removing the GTA furnace ...

Disassembling and Reassembling the GTA Furnace Workhead

Answer

This Information Applies To: Agilent GTA 120, 240/280 GTA Furnace

Issue

Before replacing the electrodes and/or shroud, the GTA Furnace workhead will need to be disassembled. After replacing the electrodes and shroud, the GTA Furnace workhead will need to be reassembled.

Steps to Follow

Disassemble the workhead before the removal and replacement of the furnace electrodes and graphite shroud. This step allows the relevant tooling and procedures to be completed.

  
Warning: Always turn off the furnace and disconnect the power supply. Allow the furnace to cool completely before handling it.

Disassembling the furnace

  1. Remove both the quartz window assemblies from the workhead by pulling and rotating to release the O-ring (Figure 1).



Figure 1. Replacing quart window assemblies

2. Using the lever, open the workhead. The right electrode assembly should fall away from the center block (Figure 2).



Figure 2. Opening the workhead

3. Pull the center cooling block away from the left electrode housing. Position the cooling block over the rear of the unit to maximize access to the electrodes (Figure 3). Be careful not to damage the tubing.



Figure 3. Pulling cooling block and positioning it over the rear  

4. Replace the electrode and shroud, with the center block positioned (Figure 3). The tubing can remain in place when removing and replacing the graphite shroud in the center block.

  

Reassembling the furnace
Follow the steps outlined to reassemble the workhead to normal operating position.

  1. Reconnect the center cooling block to the left side electrode assembly. The pins on the left side electrode assembly should be aligned to fit into the cavities of the center block inner surface. The center block should sit against the left side electrode assembly (Figure 4).



Figure 4. Reconnecting the cooling block

2. Reconnect the right side electrode to the workhead using the lever (Figure 5).



Figure 5. Reconnecting the right side electrode

  
Tips: With the quartz windows removed, check the O-ring on the base of the assembly. It should be supple and free from kinks or cuts. Check the silicone rubber seal on the window. If either are damaged or worn, replace them.

3. Reinstall both quartz window assemblies (Figure 6).



Figure 6. Reinstalling quart window assemblies

Was this helpful?
Privacy Statement
Terms of Use
Contact Us
Site Help