Veo Observer Plus Instruções de Operação descarregar pdf (Página 75)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Operating Instructions Page 67

Factor

Evap. Temp. Guidelines

Effect

Corona Veo Corona Veo RS

Mobile phase

composition

volatile modifiers (e.g.

TFA, formic acid,

ammonium formate)

35 °C or

50 °C

non-volatile modifiers

(e.g. sodium phosphate)

Do not use ---

Mobile phase

flow rate

35 °C minimal

Analyte

Non-volatile 50 °C 35 °C or 50 °C minimal

Semi-volatile 35 °C

Use lower or

higher temperature

settings

Detector

response,

baseline noise

5.6.4 Using Gas Flow Modes (Corona Veo RS only)

The Corona Veo RS detector is capable of two separate gas pressure modes: analytical gas

flow mode and microLC gas flow mode.

Each of these modes sets a specific pressure, based upon the default gas pressure of the

nebulizer. They are designed as a simple way to optimize the nebulizer efficiency when

you use very high (analytical) or very low (microLC) flow rates that range from

0.01 mL/min – 2.00 mL/min. These modes of operation are only available when you use

compatible chromatography software.

• Analytical gas flow mode:

The gas pressure set point corresponds to the default gas pressure setting as described in

the certificate that is shipped with the nebulizer.

• MicroLC gas flow mode:

The gas pressure value is calculated by multiplying the analytical gas flow mode value by

a factor in order to optimize the gas pressure for certain types of liquid flow rates and

mobile phase compositions.

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