FAQ - Frequently Asked Questions

• Causes: The incident light intensity to the photodiode is insufficient.
  * The total light intensity (TOTAL EN) is less than 5500.(In case of RID-10A, less than 6000)

  Actions:

  • Air bubbles may have entered in the flow cell (sample cell or reference cell). Purge the flow line.
  • The flow cell may be dirty. Clean the flow cell.
  • The light intensity may have dropped due to deterioration of the lamp. Increase the lamp voltage.

 

• Causes: The incident light intensity to the photodiode is excessive.
  * The total light intensity (TOTAL EN) is over 9000.

  Actions: The set lamp voltage may be too high. Lower the lamp voltage.

 

NOTE: The lamp light intensity (the TOTAL EN value) gradually drops as the lamp deteriorates. The detector performance may be impaired if the light intensity drops excessively. Make sure that the light intensity is at least 5500. The optimum light intensity is 7000 to 7200, and can be adjusted using the LAMP VOLT setting.