Re: Agilent G1888 Headspace.
Posted: Tue Apr 16, 2024 6:37 pm
Thank you for your response! I figured out the issue. Our Agilent engineer installed a liner that he said was optimized for headspace. This one:Sorry. I don't know what to say about this. My carrier gas pressure is supplied through the Perkin Elmer headspace sampler to my split-splitless inlet that feeds the column. My split ratio of 8:1 is governed by the EPC for that inlet.
My system has a 60 m x 0.32 mm column that requires 12.0 psig to get the flow I want (running at constant pressure). My headspace sampler is set to 16.0 psig as what they call "carrier pressure". My understanding is that the 16 psig is required to pressurize the vial and ensure reliable transfer of the equilibrated sample vapor from the vial to the column. Additionally, I need 35 cc/min H2 (350 cc/min air) to support the flame. N2 is my makeup gas.
I do not use a generator at this point. All of my H2 carrier gas comes from a bottle. The secondary gauge on the regulator is set to 80 psig. Plenty of supply for all of the demand.
https://www.agilent.com/store/en_US/Pro ... /5181-8818. This is a splitless liner and the cause of the hissing from the back inlet and our generator not keeping up. I replaced the liner with a split one, and the hissing was gone and the generator could keep up. However, no peaks
Reading this document from Restek (https://www.restek.com/chromablography/ ... as-samples), it seem like this is the appropriate liner (https://www.agilent.com/store/en_US/Pro ... /5190-4047)?