Varian ProStar 340, Руководство по эксплуатации

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03-914783-00:3
Troubleshooting Guide
For further assistance phone 1-800-FOR-HPLC or contact your
local Varian office.
Symptom Possible Cause Suggested Remedy
Spikes on a
recorder baseline. Bubbles passing through
cell. Degas solvent and/or supply back
pressure to the sample cell, also
check all high pressure fittings for
leaks (both liquid and gases).
External triggering device
is creating electrical noise. Check electrical lines for good
connection and/or interference from
broad cast radiation. Check for
ground loops.
Extremely large supply
voltage transients on the
line. Remove systems that consume high
power from the line.
Noisy baseline on
recorder (random). Sample cell windows are
contaminated. Flush cell with solvents (methanol,
acetone, water, 6N nitric acid, water)
and check for leaks.
Sample input line has a
leak. Check all lines from the output of the
column to the input of the sample
cell for leaks.
Bubble trapped in sample
cell. Increase flow rate and/or back
pressure on cell.
Recorder or integrator is
grounded and is causing a
“ground loop” problem. Check recorder with voltmeter to
see if either of the signal inputs is
grounded to case or earth ground.
Photodiode window is
dirty or not attached
properly. Remove and clean photodiode
window.
Sample cell is not
screwed down to the main
unit. Check sample cell mounts and cell
holder assembly.