Veo Observer Plus Instruções de Operação descarregar pdf (Página 112)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Page 104 Operating Instructions

Problem Probable Cause Remedial Action

Loss of response

(Cont'd)

The retention times changed. Maintain the column at constant

temperature.

Air is present in the pump or an

incorrect flow rate is set. Purge the

pump (→ Pump Manual). Check the

flow rate. Consider the mobile

phase.

The gas flow is turned off. No gas flow is present to induce

nebulization.

Make sure that the gas is flowing

into the detector.

The gas flow is reduced. Reduced gas flow can lead to low

response.

Make sure that the gas is flowing

into the detector. Check gas filters

and replace them if necessary

(→ page 113).

Gas is leaking. Gas leaks interrupt the nebulization.

The gas flow value is too low on the

display. Check the gas inlet, exhaust

and tubing. Remedy the gas leak

and/or replace gas tubings.

Liquid is leaking at the detector

inlet.

Check the capillary connections.

Check the tubing connected to the

waste port of the detector for liquid.

If internal liquid leak is observed,

contact Service.

Poor peak area precision The autosampler draws air from

the vial.

There is not enough amount of

sample in the vial, the needle height

setting is incorrect (→ Autosampler

Manual), or there are too many

replicates.

There are air bubbles in the

syringe or the autosampler flow

connection parts.

Flush the syringe (→ Autosampler

Manual).

Non-degassed wash solution is

used. Degas the wash solution

(→ Autosampler Manual).

There is a gas bubble in the flow

path.

Perform a wash cycle

(→ Autosampler Manual).

The draw speed is too high. Reduce the draw speed

(→ Autosampler Manual).

The gas content of the sample is

too high or saturated.

Reduce the draw speed

(→ Autosampler Manual).

Degas the sample if possible.

The needle is clogged or the

needle tip is deformed.

Replace the needle (→ Autosampler

Manual).

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