Veo Observer Plus Instruções de Operação descarregar pdf (Página 110)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Page 102 Operating Instructions

Problem Probable Cause Remedial Action

High noise, non-periodic

baseline fluctuation

(Cont'd)

There are temperature fluctuations

in the laboratory.

Check the thermostat in the

laboratory. If possible, note the

temperature fluctuations/values in

the system log.

Periodic baseline

fluctuation, pulsation

There are pressure fluctuations

from the pump.

Purge the pump; check general

function (→ Pump Manual).

There are air bubbles in the

system.

Purge the system

(→ Pump Manual).

Peak Tailing Too large extra column volume Use short capillary connections with

a suitable inner diameter.

There are bad capillary

connections.

Use different capillaries, for

example, Viper capillaries.

Peak Broadening,

increased dead time

The inner diameter of the

capillary to the detector is too

large.

Change the capillary.

The filter frits on the solvent lines

are clogged.

Check the filter for permeability.

Replace the filter frit if necessary

(→ Pump Manual).

The capillaries are clogged or

capillary connections bad.

Replace the capillaries. Use

different capillaries, for example,

Viper capillaries.

The sample loop is clogged.

Replace the needle (→ Autosampler

Manual).

The proportioning valve is

defective.

Contact Service.

The column is overloaded or

contaminated.

Clean or replace the column.

The eluent has changed. Use fresh solvent.

Reproducible ghost

peaks in the

chromatogram.

The degassing channels are

contaminated.

Rinse the degassing channels

(

→

Solvent Rack or Pump Manual).

The solvents are degraded or dirty

or their purity is insufficient.

Use fresh and appropriate solvents.

Contamination occurs in the

autosampler or somewhere in the

system.

Flush the autosampler or the entire

system using an appropriate solvent.

Some broad ghost peaks

in the chromatogram.

Late eluting peak from previous

analysis.

Extend the run time. Increase the

elution strength of the gradient

(higher organic content). At the end

of the run, flush column with strong

eluent.

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 143 144

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