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Simdis Trouble Shooting AC Analytical Controls February 2001
Problem areas Contamination Leaks and column septum bleed Electronic / mechanical failure
Baseline symptoms Ghost peaks : Contamination by septum Solvent / wash bottles in auto sampler is contaminated Wrong syringe in auto sampler
Baseline drift Leak Carrier gas line Improper column installation Saturated filter Carrier gas purity Column contaminated with HB components
Poor peak shape Column overload Bad column – liner connection Broken column Old column
No peaks Auto sampler / syringe problems Incorrect signal assignment Flame out No carrier gas
Poor Separation Bad column – liner connection Check method instrument settings – Flow too high Contaminated calibration mixture Old column
Reference Off spec. Contaminated solvents causes a bad blank Detector nut leak Incorrect calibration table settings Septum leak Column overload
Low Calibration Peaks Preparation of calibrant mixture Hydrogen / air ration on FID Detector leak Restricted FID Wrong FID jet
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