Chromatography Forum

What is the typical pump cycle numbers expected for pump seals? I'm pumping either water or 22mN MSA.

I haven't done my yearly PM on the pump except for the check valves and I'm looking for a *general* life expectancy on the seals if anyone has the experience to share.

Thanks,

Also, could someone please explain to me the "Pressure Statistics" screen? (menu-8-7). I remember this from previous troubleshooting but have forgotten it's use in diagnosis of problems and I can't seem to find anythoing in the manual.

Specifically, the P-point Left and right numbers and the difference between the flow mode being on or off.

Thanks again and sorry for the x2 post

GP-50 User's Manual: http://www1.dionex.com/en-us/webdocs/45 ... 03_V12.pdf

I've had one head of a GP50 last two years with no PM and the other on the same system last 9 months. My hydroxide based system requires new seals every six months while my carbonate system is done once a year but could probably go for another 6+ months. It's a gamble not to do one no matter what. The little devil on your shoulder will say live dangerously! The angel will say play it safe. The devil says hoard the money, the angel spread the wealth.