Operating instructions

Charged Aerosol Detectors
Corona Veo and Corona Veo RS
Operating Instructions Page 59
5.4 Before Operating the Detector
5.4.1 Setting the Gas Pressure
The internal gas regulation provides the gas pressure to the nebulizer to create the aerosol.
Make sure that you set the gas pressure for the nebulizer before you perform an equilibration
of the detector.
Setting the gas pressure is required in the following cases:
• After you have installed or replaced the nebulizer.
• If the gas pressure has fallen outside of the specified setting of the nebulizer.
• Corona Veo only
The gas regulator knob will sometimes drift so that the gas pressure needs to be re-
adjusted.
• Corona Veo RS only
If you operate the detector from a chromatography data system and use the analytical or
microLC gas flow mode.
The gas pressure must match the recommended gas pressure setting as indicated on the
certificate that is shipped with the FocusJet nebulizer. For more information about the
nebulizer installation, refer to the Installation Instructions for the nebulizer.
Important: Always turn on the gas supply before starting the flow of mobile
phase. Wait at least 5 minutes before turning on mobile phase flow.
Important: Toujours couper l'alimentation en gaz avant de commencer le débit
de la phase mobile. Attendez au moins 5 minutes avant de se tourner
sur le débit de la phase mobile.
Tip: If the gas pressure is outside of the recommended gas pressure
setting for the respective nebulizer, the detector may experience a
loss in performance.
Setting the Gas Pressure for the Corona Veo
Set the gas pressure manually with the manual gas regulator knob on the rear panel of the
detector. The knob will change the pressure by approximately 138 kPa (20 psi) per revolution.
Tip: Write down the gas pressure reading as indicated on the display before you set
the gas pressure.
1. If applicable
Stop the mobile phase flow from the pump and wait several minutes for the detector
pressure to stabilize.