Chromatography Forum

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viewtopic.php?f=1&t=2617

And by the way, the 3000MWD *is* a diode-array detector, but with different firmware so that you are allowed only 8 wavelengths.

today the technical engineer came to fix the device,after he has gone the baseline was much better but not the best, so i decided to wash the device (channels,fittings, flow cells)with heated water to 40 °C in two channels and the other two channels i used isopropanol and acetonitrile and then i exchanged channels
this helped abit to improve the baseline but still not the best
note: the baseline become good at wavelength 360 nm but still abit noisy at 210 nm ,220 nm,225nm,230 nm even after washing (please look at the attached pictures)
here are the pictures of the baseline



after washing the device

today the technical engineer came to fix the device,after he has gone the baseline was much better but not the best, so i decided to wash the device (channels,fittings, flow cell)with heated water to 40 °C in two channels and the other two channels i used isopropanol and acetonitrile and then i exchanged channels
this helped abit to improve the baseline but still not the best
note: the baseline has become good at wavelength 360 nm but still abit noisy at 210 nm ,220 nm,225nm,230 nm even after washing (please look at the attached pictures)
here are the pictures of the baseline



after washing the device

I do not see any zigzags there.

Which baseline is from before the engineer, and which after ?

What did the engineer do ?

Peter

the first two pictures right after the technical engineer left, the remaining three pictures after washing during washing i tried baseline autozeroing several times but still noisy at wavelengths 210,215,220,225,230 nm and steady at wavelength 350,360,370

yes the zigzag noise was fixed but still the baseline not the best at the mentioned wavelengths