Veo Observer Plus Instruções de Operação descarregar pdf (Página 111)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Operating Instructions Page 103

Problem Probable Cause Remedial Action

Spikes Electrical interferences from other

modules.

Isolate the electrical circuit from

strong current consumers. Consider

using an UPS (Uninterruptible

Power Supply) to filter current

fluctuations.

Ground the detector using heavy

gauge wire from the thumbscrew

ground terminal that is located on

the power supply module to the

main power ground.

The column temperature is

significantly above boiling point

of the mobile phase.

Use a post-column cooler or reduce

the column temperature.

Negative Peaks Sample solvent and mobile phase

differ in composition.

Dissolve the sample in the mobile

phase.

Wrong polarization of the analog

output interface.

Check the analog output

polarization.

Loss of response Analytes of interest are not

sufficiently stable.

Some compounds will decompose

as a function of time.

Check the stability regularly, and

prepare fresh standards. If

necessary, change conditions.

The pH of the solvent or the

mobile phase composition has

been changed.

Check the mobile phase.

Mobile phases should be freshly

prepared.

Use a fresh mobile phase.

A parameter has accidentally been

changed.

Check the settings and verify that

the detector is turned on and data

acquisition is started.

Autosampler components may be

partially or fully clogged.

Make sure that the sample and

mobile phase are clean.

Flush the autosampler

(→ Autosampler Manual).

The stream-switching valve

(SSV) is in the divert position

(Corona Veo RS only).

Make sure that the SSV is directing

liquid to the nebulizer.

The drain pump of the detector

has failed.

In the System Setup menu, make

sure that the drain pump is turned

on. If there is excessive gas venting

from the Waste port, contact

Service.

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