• Created : 
  • Modified : 
  • Category :  Agilent Knowledge Portal
  • Entry Type :  Article
  • Product Type :  Atomic Absorption Systems
  • Component :  Atomic Absorption Instruments
  • Product Name :  240FS AA 240Z AA 280FS AA 280Z AA 55B AA
  • Task :  Maintenance
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Replacing a Hollow Cathode Lamp

Answer

This Information Applies To: Agilent atomic absorption systems (AA 240/280/55B/240Z/280Z)

Issue

Replacing hollow cathode lamps is a common maintenance procedure and can be used during troubleshooting to isolate the source of an error. 

Steps to Follow

If you are developing a method using an uncoded lamp, install the lamp as described in the following procedure and note the position. The numbers of each lamp position are clearly marked. Enter the lamp position number for the current method on the Optical page of the Method window before use.

  
Warning:  Hot surface and electric shock Hazards: Lamp surfaces and brackets become hot during operation and remain hot for some time after being switched off. Lamps operate at high voltage. Contact with this voltage can cause death, serious injury, or electric shock.

 

To remove a hollow cathode lamp

  
Warning: Before changing the lamp, always ensure that the instrument is powered off, the power cable is unplugged, and the instrument has cooled completely.

  1. Ensure that the lamp position is turned off.

  2. Open the lamp compartment door.

  3. Hold the lamp by the base.

  4. Press and hold the white button at the end of the bracket to release the lamp (see Figure 1).


    Removing the lamp.
    Figure 1. Removing the Lamp 

  5. Gently remove the lamp from the socket.

  6. Release the white button

To install a hollow cathode lamp

 

  
Caution: If you are using an uncoded lamp with an existing method, review the method to find where the lamp must be installed. A coded lamp may be used in any position, regardless of the position specified in the method.

 

  
Caution: Always hold the lamp by its base. Do not touch the quartz window at the end of the lamp. Touching the glass envelope will reduce the lamps' efficiency.

  1. Ensure that the lamp position is turned off.

  2. Open the lamp compartment door on the left side of the instrument.

  3. Hold the lamp by its base and align the lamp base so that the ridge on the guide pin (Figure 2, item 1) is matched with the notch in the socket (Figure 2, item 2).


    Lamp base and socket.
    Figure 2. Lamp base and socket
    1. Lamp base, 2. Lamp socket

  4. Press and hold the white button on end of the lamp socket bracket.

  5. Slowly release the button as you push the lamp fully into the socket.

After installing a new hollow cathode lamp, it is best practice to align the lamps. See the article Troubleshooting and Maintenance of AA Systems: Part 1 - Hollow Cathode Lamps

 

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