Appro LC-7451 Instrucciones de operaciones descargar pdf (Pagina 118)

UltiMate 3000 Series:

VWD-3100 and VWD-3400RS Variable Wavelength Detectors

Page 110 Operating Instructions

Problem Probable Cause Remedial Action

The system has very high

backpressure.

Fluidic parts in the system

(capillaries, filter, column) are

blocked by precipitate, or

capillaries are damaged by

bending.

Check the capillaries in the

system step by step from the

detector to the pump, remove

the blockage, or replace the

capillaries.

High baseline drift The shipping locks for the optics

have not been loosened.

Verify that the shipping locks

for the optics have been

loosened (→ Fig. 8, page 34).

The column is contaminated. Clean or replace the column.

The system is not sufficiently

equilibrated.

Flush the system until

equilibration. Usually, a

volume of 5–10 times the

column volume will be

sufficient.

The eluents are degraded or

inhomogeneous.

Before you start an analysis,

homogenize eluents already in

their reservoir. Use fresh

solvent and check the eluent

filter frits. In aqueous solvents,

growth of microorganisms is

possible.

The environmental conditions are

unstable.

Make sure that the temperature

and the humidity are constant.

Avoid draft. Verify that the

lamp and flow cell covers are in

proper position and that the

front panel door is closed.

The detector has not yet reached

the operating temperature.

Allow the full detector warm-

up time (at least 60 minutes).

The mobile phase is delivered in

circles.

Direct the mobile phase to

waste.

The flow cell may be dirty. Clean the flow cell

(→ page 125). If necessary,

replace the flow cell

(→ page 126).

The lamp is too old.

Replace the lamp (→ pages 121

and 123).

The lamp is new. Allow the new lamp to run for

at least 24 hours before the first

analysis.

Change the wavelength.

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 159 160

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Appro LC-7451 Instrucciones de operaciones Pagina 118

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