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Possible dead PDA?

http://chromforum.org/viewtopic.php?t=114614

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Possible dead PDA?

Posted: Wed Nov 10, 2021 4:37 pm
by itspip
I have a Dionex UVD340U PDA that I was using for analysis of phthalates. I noticed a massive jump in noise (+/- 100 mAU) that removed all peaks in my chromatogram. I cleaned the flow cell with IPA, water, and dilute nitric acid to no avail. I have checked the solvents for potential purity issues. I finally removed the column and ran water through and did a gradient check from 100% water to a 1% Acetone solution. I can see the peaks I should with acetone, but the noise is too high to do any work with it.

I am wondering if there is something to check in the PDA, like a photomultiplier tube going bad, or is the detector dead?

Thanks

Re: Possible dead PDA?

Posted: Wed Nov 10, 2021 5:18 pm
by vmu
Maybe it's time to change the lamp. There is no photomultiplier tube in a PDA detector.

Re: Possible dead PDA?

Posted: Wed Nov 10, 2021 7:06 pm
by itspip
Lamp was replaced. Same issue.
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