Gow-Mac 580 series, Operating Manual

Page: 58 / 68

GOW-MAC Instrument Co. 58
Symptom Cause Remedy
Constant baseline drift in Detector temperature Allow suffi cient time for
one direction. increasing (decreasing). detector to restabilize after
changing its temperature.
Leaks causing fi lament Check for leaks.
oxidation.
Column bleed. Replace column(s).
Irregular baseline shifting. Column not properly Condition column.
conditioned.
Excessive column bleeding Use diff erent column. Some
from well conditioned column. packing materials cannot be
operated at elevated
temperatures without diffi culty.
This symptom may occur even
on well conditioned columns in
which carrier gas fl ow rates
have been carefully optimized.
High background noise Column contaminated Recondition column.
or excessive column bleed.
Contaminated injector. Clean injector and replace
septum.
Contaminated detector. Clean detector.
Defective recorder. Set GC Attenuator to infi nity
(

). If noise continues, check
recorder. See recorder
manual.
Recorder slidewire dirty. Clean recorder slidewire.
Carrier gas fl ow rate Reduce carrier gas fl ow rate.
too high.
Carrier gas leaking. Locate and correct leak.
Bad ground connection. Make sure all instruments are
connected to good earth
ground.
Electronic circuitry dirty. Consult GOW-MAC
Engineering.