7
Troubleshooting
Detector-Related Problems
98
Surveyor PDA Plus Detector Hardware Manual
Thermo Scientific
2. Random noisy
baseline.
a. Contaminated flow cell.
a. Flush the flow cell with cleaning solvents
as described in
. Check for leaks.
b. Leak in sample inlet line.
b. Check all of the fittings from the
column outlet to the flow cell inlet for
leaks.
c.
Bubble trapped in flow cell.
c.
Increase the flow rate until the bubble is
removed. Supply a backpressure device
to the flow cell (check pressure rating to
avoid rupturing flow cell).
d. Leaking flow cell.
d. Replace the flow cell.
e.
Insufficient lamp warm-up.
e.
Allow a 30 minute warm-up for normal
operation and a 1½ hour warm-up for
maximum sensitivity.
f.
Lamp aging or defective.
f.
Replace the lamp.
g. Ground loop problem between
integrator and detector.
g. Check for proper cable connections for
detector output; do not ground at both
ends of cable.
h. Flowcell or lamps dirty.
h. Clean the dirty component.
i.
Integrator input voltage does not match
detector output voltage.
i.
Verify that the integrator is connected to
the appropriate Analog Output
connections on detector. (See
) Check the attenuation
setting on integrator.
Table 3.
Troubleshooting detector-related problems (Sheet 2 of 4)
Symptom
Cause
Remedy
