2 Replies Latest reply on Oct 16, 2018 8:14 AM by james_jenkins

    Need direction new 7890B

    tomjames

             I am using 7890B GC with a VB-624 capillary column and a dynacalibrator 150. The analyte is  gravimetrically verified benzene perm tubes 50 ng/min each i am trying to create a calibration standard using multiple permeation devices. I have my carrier stream set to 30 ml/min and a column flow of 100 ml/min. My pressure 25 psi  get a response signal but it looks weak (small bump) what adjustments should i make to get a stronger looking response (definitive peak) ?