Page 191 - Basic Gas Chromatography

AND/OR REMEDY the of flow gas sometimes provides gas carrier for time stabilize its important detector. lag will block somewhat large its diffusion small a allow enter to air a at in This rate. the oxidize a at elements while rate their changing the Locate These correct. very often difficult and carrier high (60— necessary. or detector

CHECKS temperature oven. column carrier Replace regulator; pessure higher control. better Replace tank. sufficient Allow to detector changing after temperature. Particularly TC with Detector indicated temperature of because mass. small very will leak of amount detector the constant will turn effected constant slowly resistance. and leak very are leaks,

d. e. 7a. the A b. c. 8a. b.

CAUSE flow defective. tank to low to temperature (decreasing). stream down end effiuent only). detector detector). (TC column when rises.

POSSIBLE gas Carrier regulator gas Carrier too pressure regulator allow properly. control Detector increasing leak Flow column detector (TC Defective filaments in Increase “bleed”? temperature Column(s) contaminated.

oystems d. e. 7a. b. of c. 8a. b.

GC baseline when baseline temperature
froubdiesnooting SYMPTOM Constant 7. one in drift direction operating isothermally. ee Rising 8. when programming.

Systems as instrument columns the always baseline when correct. block. and over See base. flow insure Make has tank flow air flow detector filament. manual oven controller, control sensing °C set

GC AND/OR REMEDY column in Some to impossible at well operating These will some particularly high at conditions. and leak detector temperature detector out detector manual. gas carrier and to operation. gas carrier pressure. and H, proper insure regulation. and TC or instrument electrometer troubleshooting. detector temperature temperature probe. oven
Troubleshooting CHECKS Stabilize c. outlined manual. are stabilize desired conditions. columns produce drift, operating sensitivity Locate d. Clean e. Raise bake night. Clean f. instrument Check g. regulator controllers proper sure sufficient Check h. to rate Replace i. assembly See j. on Replace 6a. and/or sensing Replace b. module, probe. Set

CAUSE packing leaking. block base detectors). gas air or oniy). (FID filaments detector (TC defective detectors). oven controller oven defective. °C TEMP control main low. too

POSSIBLE Column bleeding. gas Carrier Detector contaminated. Detector contaminated (ionization carrier Poor regulation. H; Poor regulation Detector defective only). Electrometer (ionization Detector temperature defective. Column temperature OVEN on control set panel

c. d. e. f. g. h. i. j. 6a. b. c.

baseline
SYMPTOM Sinusoidal

176 6. drift. oN