Chromatography Forum

Hi all

I'm looking for the optical diagram of a typical diode array detector, for a lecture on chromatography for students.

I couldn't find a good diagram on the net. I downloaded some product catalogs, but no luck with them either. Waters has a good optical diagram in its 2996 PDF brochure, but alas, one cannot copy and paste that diagram from the PDF brochure. Copyright reasons, I suppose.

I simply cannot find a simple optical diagram that I can use to explain the principles of diode array detection to students.

Can anyone help please? If any of you could give me a suitable web-link, that would be really useful.

Thanks in advance.

S.K. Srinivas
K-Prime, Chromatography Training
Bangalore, INDIA

Select the camera tool on your PDF reader, then select the portion of a page that you want copied to the clipboard by clicking and dragging. You can generally copy from PDFs, but they are not "Windows compliant".

You may also want to check Thermo & Agilent web sites for pictures.

There is a generic diagram in the FAQ (the link is near the top left of the screen, just under the Chromatography Forum logo. Drill down through LC questions to the one about the difference between a PDA and a DAD. You have my permission to use it.

Dear DR :

Thanks. I did try the camera tool in Acrobat. But there are several PDF documents (and websites) that do not permit the use of that particular tool. One can copy text, but not images. Waters and Rheodyne are two examples.

I realise there are copyright issues involved, but I need such images solely for teaching chromatography, not for any other reason. I usually make do, by scanning images from textbooks and catalogs, or even drawing them using Paintbrush, but they're not comparable to a good JPG image, or an animated GIF.

As I found out the hard way, it's almost impossible to draw a Gaussian peak by hand!

That's why I turned to Chromforum for help. And thank you, you guys did give me some good ideas.

Dear Tom:

Thank you very much. Those two images are just what I needed. I will not forget to mention where I got them from.

While on the subject, I have been conducting training programs in HPLC since '94.

My programs vary a lot : entry-level programs for new chromatographers, method development, troubleshooting, and regulatory issues.

All my training programs have one common module though - a visit to the Chromforum website.

I make it a point to introduce each program participant to Chromforum. Invariably, they are pleasantly surprised that virtually every chromatographic problem they have faced has already been discussed in the forum.

After twenty years in chromatography, I get pleasantly surprised too! Every day, one comes across fascinating new problems in the forum, with equally fascinating answers to them. I put in my two penny's worth, when possible, but to me, a daily visit to the forum is more of a learning experience - and it's fun. Just plain fun.

I make my living from teaching chromatography, and Chromforum is a very useful teaching tool and technical resource.

So thanks again, to yourself, and to Chromforum.

S.K. Srinivas, MPharm
K-Prime, Chromatography Training
Bangalore, INDIA

S.K, thanks for the kind words. Your activitiesand experiences in India are very similar to LC Resources' in North Americal and Europe (which is why we started the Forum back in 1999). It has grown to be a tremendous teaching tool as well as a personal learning experience.

I can't take any personal credit for the success or utility of the Forum, though. That's entirely due to the many contributors who go out of their way to answer questions and provide advice. Probably the most amazing thing about the Forum membership is the high degree of professionalism and collegiality (evidenced by the almost complete lack of "flames" or personal attacks).