Baseline Offset
is Extreme
No Air
No Sample
No Carrier
Verify
sample is
flowing to the
sample valve
NO PEAKS
Column Broken or
Not Connected
FPD Failure
No peaks are indicated on the strip chart
recorder, graphics display, or detector
signal.
Solenoid Valve
Not Moving
Solenoid Valve
Vent Obstructed
Method
Table Entries
Sample Valve
Failure
Low Zone
Temperatures
DOUBLE
SAMPLING
Double sampling problems are isolated to the sample valve. Generally the first injection
occurs when the valve is turned on (valve stem inserted into the injections chamber). The
second injection occurs when the valve is turned off (valve stem is withdrawn from the
injection chamber.
The chromatogram peaks appear to have
double apexes. The trailing peak apex is
generally smaller than the leading one due to
the first having the greater sample size.
MYSTERY PEAKS
Calibration Sample
Only
Verify that the correct
calibration sample is
being used
Chromatograph displays extra peaks or a
noted difference in composite chromatograph
appearance from that of the calibration.
All Process and
Calibration Samples
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