Lamp Does Not Light; Noisy Baseline - Thermo Scientific Dionex ICS Series Operator's Manual

Dionex VWD Operator's Manual
4.4

Lamp Does Not Light

•
Lamp is old or burned out
Replace the lamp. For deuterium lamp (P/N 066347) installation instructions,
see Section
Section 5.4.
4.5

Noisy Baseline

•
Mobile phase or post-column reagent is degraded
Prepare all mobile phases and reagents with spectro-grade solvents, reagent-
grade chemicals, and ASTM Type I (18 megohm-cm) filtered, deionized
water that meets the specifications listed in
•
Leaking fittings
Locate the source of the leak. Tighten (or replace) all liquid line connections
(see Section
•
Insufficient time for system equilibration after turning on lamp(s)
To achieve optimum results, allow 60 minutes for the lamp(s) to stabilize
before beginning operation.
•
Strongly-retained components from previous analysis are slowly eluting
To elute strongly-retained species, use a stronger mobile phase. Re-equilibrate
with the standard mobile phase before resuming routine operation.
Clean the column as instructed in the column manual. Column manuals are
shipped on the Thermo Scientific Reference Library DVD (P/N 053891). If
the problem persists, refer to the column manual for troubleshooting
guidance.
•
Plot scale exaggerates baseline noise
If autoscale is selected, even a plot with low noise may fill the screen. Check
the Y-axis scale values.
•
Pump needs priming and/or maintenance
If the baseline noise is synchronized with the pump stroke, reprime the pump.
The piston seals and/or check valves may also need to be cleaned. Refer to the
pump or system operator's manual for instructions. Pump and system
56
5.3. For tungsten lamp (P/N 066348) installation instructions, see
5.1).
Table B-1.
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