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delta p for merck HPLC column

http://www.chromforum.org/viewtopic.php?t=24634

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delta p for merck HPLC column

Posted: Tue Apr 15, 2014 4:26 pm
by tarzan
hi all
the CoA for merck lichrocart says something like this
===============
test results for toulene
k=1.9
N/m=82789
As=1.0
delta p=64 bar
=======================
what does this delta p stand for ...?

hoping to get some information ....

with best wishes

Re: delta p for merck HPLC column

Posted: Tue Apr 15, 2014 8:49 pm
by Vlad Orlovsky
usually back pressure observed with CoA mobile phase

Re: delta p for merck HPLC column

Posted: Wed Apr 16, 2014 3:16 am
by tarzan
hi thanks for the quick reply
the CoA says 60 bar for 75:25 ACN water ..
but I get 90 bar ...??

what should i do ..?

bets wishes ...

Re: delta p for merck HPLC column

Posted: Wed Apr 16, 2014 3:54 am
by Vlad Orlovsky
See how much back pressure you have without column. May be the difference comes from your system

Re: delta p for merck HPLC column

Posted: Thu Apr 17, 2014 8:54 am
by Gerhard Kratz
An external manometer after the column will give you the exact pressure. Maybe the built in electronic pressure damper is not set properly!
Can be set by the service technician. Good luck.
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