How do I determine my sequence timing when using a 9525 Degassed Cationic Conductivity Panel?

Document ID

Document ID TE12925

Published Date

Published Date 08/19/2021
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Question
How do I determine my sequence timing when using a 9525 Degassed Cationic Conductivity Panel?
Summary
sequence timing for 9525 degassed cationic conductivity panel 
Answer
 Since the 9525 Degassed Cationic Conductivity Panel provides 'real time' results, there are really only 2 factors to take into account for setting the sequence timing. 
 
1. Transport Time (based upon 150 cc/min sample flow).  You may also need to consider any transport time from your sampling point to the 9525 panel.
  • Panel inlet to SC cell        < 5 seconds
  • SC cell to CC Cell               1.3 minutes
  • CC cell to DCC cell            2.3 minutes more  (or 3.6 minutes from Panel in to DCC cell)
     
2. Sample Stabilization Time.
It is recommend to start with at least another 8-10  minutes or so to make sure DCC value has stabilized before switching.
 
Based off the above estimates, start with 12 – 15 minutes between samples and verify by seeing if the DCC reading is stable within that timeframe.
 
The Resin Column does allow for a lot of sample mixing and takes some time to stabilize.
The rest of the system is more of a plug-flow configuration where the new sample simply pushes out the old.
 
IF NO RESIN COLUMN – there is less sample mixing and you may be just fine switching every 7-10 minutes.

See the following articles for more information on the 9525
 Does the 9525 Degassed Cationic Conductivity Panel yield results in real time or is it a batch analysis?
Hach 9525 Degassed Cationic Conductivity Panel Customer Presentation

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