Page 192 - Basic Gas Chromatography

Systems LI? Systems GC Troubleshooting AND/OR CHECKS REMEDY CAUSE POSSIBLE SYMPTOM column Recondition 12a. column Contaminated 12a. phase background High 12. 8b.) (see “bleed” excessive or (noise). signal column. from columns. regenerate or Replace b. carrier Contaminated b. as filter. gas carrier instruction gas. by filter Regenerate about to heating purging

GC AND/OR REMEDY liquid less low temperatures. different columns in Short zero. with input adjust and system See manual. detector. different “‘bleed.’’ less column temperature. detector assemblies. system in Remove lines system to instrument problem. locate air or keep to care chamber wool, sieve dust filter), or out Blow remove to insulators wit
froubleshooting CHECKS Use 9a. and Use Condition b. outlined manual. 8b. See c. Reset 10a. system wire of zero. instruction Replace b. Use c. with lower Clean d. head Connect e. described manual. jumper either connection shield. Locate lla. minimize not do heater blowers. Take b. detector glass of molecular air etc. detector Clean c. conn

CAUSE column well from columns. properly not system data set. out filaments (TC from signal “bleed” FID). and (FID improperly atmospheric from changes closing etc. blowers, other or burned material only). (FID and/or insulators (Ionization voltage

POSSIBLE Excessive “bleeding” conditioned Columns conditioned. Column(s) contaminated. on Zero improperly Detector balance detector). Excessive column (especially detector Dirty EC). system Data connected. Quick pressure opening and doors, particles Dust foreign flame Dirty connectors detectors). High line fluctuations.

9a. b. c. 10a. b. of c. d. e. 11a. b. in c. d.

be at intervals.
baseline
SYMPTOM Irregular when shifting temperature programming. Baseline cannot zeroed. “spiking” irregular —44-$4—

178 9. 10. Sharp 11. 4