Maximum head pressure for 5890 IIa EPC

[MSCHemist]

Hi all I have a quick question:

What is the max pressure I can run on a 5890?

I am adapting/developing a method for amino acids analysis via ethyl chloroformate derivitization. The original method uses a 10m .25 .25 1701 column. I am unhappy with the resolution between glutamate (our prime analyte MSG) and phenylalanine and I am also planing to switch to H2 from He in the near future so I am looking at .18 columns. There is a 20m .18 .18 column (the only 10m has .43 phase thickness) available. According to method translater I would be running at maximum 34psi for direct tranlation or 26 psi for maximum efficiency. The orginal method uses rather high linear velocities to save time 53-73 cm/sec

[aldehyde]

i think 100 psi, 30-40 psi should work fine.

[Bigbear]

Agilent has 2 EPC modules. One with a max pressure of 100psi, the other is 150.

[MSCHemist]

Wow I never thought of running a GC at 100 psi. Agilent doesn't even recommend supplying gases to the inlet from the regulator at 100 psi (I set it at 80). However chemstation allows me to enter it. I never go much past 25 on my 6890.

[AICMM]

MSChemist,

There are some packed column applications that use very high head pressures. In addition, very narrow id capillary columns require much higher head pressures.

Best regards,

AICMM