BUCHI ELS Detector C-650 - Manual (Page 47)

C-650 Operation Manual, Version B 8 Troubleshooting 47
8.5 Nebulizer cleaning and replacement procedures
If the mist of the nebulizer is not homogeneous, the nebulizer, the needle or the PTFE tube may
be obstructed. To remove the obstruction, pump a solvent (recommendation: ethanol) that can
dissolve the foreign material. As an alternative, the nebulizer can be placed in an ultrasonic bath
to dissolve the foreign material.
Handle the nebulizer carefully and do not disassemble the rear part of the nebulizer, which is
protected by the colored thermal seal. Improper handling of the nebulizer will destroy it and this
will void the warranty.
The nebulizer rear part is a strategic setting which mustn’t be dismounted for any reason. In case
the user has removed it, the only solution is to perform a nebulizer replacement.
If the nebulizer cannot be repaired by cleaning by pumping solvent through it or with an ultrasonic
bath, it requires a replacement.
In case the nebulizer does not produce a spray and the liquid is drawn directly to the siphon even
if the pressure display is 2 bar, make sure you are using the correct black gas tube orientation
fitting for the nebulizer, where the white one-way valve is at the lower end (near the gas arrival) on
the front panel. The installed Nebulizer/Glass Chamber assembly is shown in Fig 5.10.
To remove the nebulizer from the device:
• Switch off the pump and the ELSD detector.
• Remove the black front panel cover. Pull its left side.
• Disconnect the nebulizer liquid inlet from the column
• Disconnect the gas inlet from the nebulizer by pushing
on the white inlet (refer to Fig 5.10 for details).
• Remove the nebulizer from the glass cell by unscrewing
the black plastic nut with the right hand whilst maintain-
ing the nebulizer with the left hand. Take care not to pull
or twist the nebulizer capillary. The black nut which main-
tains the nebulizer on the glass cell and its seal should
be removed from the nebulizer.