Veo Observer Plus Instruções de Operação descarregar pdf (Página 114)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Page 106 Operating Instructions

Problem Probable Cause Remedial Action

Noisy baseline, high

background current

The mobile phase is

contaminated.

Use fresh solvent. Use HPLC-grade

eluents only.

Highly retained compounds are

being eluted from the column.

This may occur when a new mobile

phase or column is used.

Allow the system to equilibrate for

an hour with the new mobile phase

or until the baseline is stable and

check the signal again.

Remove the column and re-establish

flow. If the signal drops, clean or

replace the column (→ TCC

manual).

Fittings are leaking. Check the flow path connections.

Tighten fitting connections if

necessary.

Contamination occurs somewhere

in the system.

Flush the system using an

appropriate solvent.

The detector is flooded with

solvent (pump flow is turned on

while no gas flow is present).

This may occur if the detector is

turned off.

Clean and dry all aspects of the flow

path. Operate the detector without

liquid flow (pump flow is turned

off) or with liquid flow being

diverted with gas flowing for 24

hours.

Inability to autozero the

signal

High background signal on a very

sensitive current range

(background >10 x gain)

Use a mobile phase that provides a

lower background (lower

concentration of impurities).

Increase the current range.

The autozero occurs on a peak or

the void signal.

Autozero on a relatively flat section

of the chromatogram.

Autozero on a very noisy signal. Reduce the noise or increase the

current range.

Liquid in the gas exhaust The detector is flooded with

solvent (pump flow is turned on

while no gas flow is present).

This may occur if the detector is

turned off when liquid is still

flowing into the detector.

Clean and dry all aspects of the flow

path. Operate the detector without

liquid flow (pump flow is turned

off) or with liquid flow being

diverted with gas flowing for 24

hours.

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