Veo Observer Plus Instruções de Operação descarregar pdf (Página 113)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Operating Instructions Page 105

Problem Probable Cause Remedial Action

Poor peak area precision

(Cont'd)

The autosampler, the injection

valve, or the syringe valve is not

tight.

→ Autosampler Manual

Carry-over occurs in the system. Flush the needle using an

appropriate solvent (

→

Autosampler

Manual).

The capillary connections are not

installed properly or they are not

tight.

Check and tighten the capillary

connections.

Exchange the needle seat if

necessary (→ Autosampler

Manual).

Exchange the needle if necessary

(→ Autosampler Manual).

There are dead volumes in the

capillary connections.

Replace the fittings. Make sure that

the capillaries are installed

correctly. Thermo Fisher Scientific

recommends using Viper capillary

connections whenever possible.

The piston seals are not tight.

Replace the seals (→ Pump

Manual).

There is air in the working head. Purge the pump; check general

function (→ Pump Manual).

There is pump pulsation. Use degassed solvents.

The gradient is irreproducible. Change the gradient.

Check the pump function and

degassing.

Check the filter frits in the solvent

line filters for contamination.

Replace the frits if necessary.

The sample is unstable and

decomposes.

Use new sample or change the

conditions. Cool the sample in the

autosampler if possible.

Baseline fluctuations see "Baseline Fluctuations"

The environmental conditions are

unstable.

Make sure that the temperature and

air humidity are constant. Use

column thermostatting. Avoid draft.

Contamination occurs somewhere

in the system.

Flush the system using an

appropriate solvent.

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