BUCHI ELS Detector C-650 - Manual (Page 43)

C-650 Operation Manual, Version B 7 Maintenance 43
7 Maintenance
This chapter gives instructions on all maintenance work to be performed in order to keep the
device in good working condition.
WARNING
Death or serious burns by electric current at cleaning.
• Switch off the device
• Disconnect the power cord and prevent unintentional restart
• Wait until the device is completely dry before reconneting to mains
NOTICE
Risk of housing and device damage by liquids and detergents.
• Do not spill liquids over the device or parts of it
• Wipe off any liquids instantly
• Use ethanol or soapy water as detergent only
The ELSD C-650 Low Temperature Evaporative Light-Scattering detector is designed to require
a minimum of maintenance activities. If preventive maintenance activities are followed, the detec-
tor should provide high sensitivity measurements without intervention by the operator.
The following general recommendations are proposed:
• Maintain the detector in a clean laboratory environment.
• If the device is not going to be used for a period of time, flush out any mobile phase that
contains acids, bases or salts to prevent the deposition of foreign matter on components or
corrosion of the device.
• Only use clean gas (particle-free and oil residue-free).
Closing gas valve while the pump is still running may result in serious nebulizer damage.
If ELSD is used as a second detector and is not being used for some time, it is recommended to
remove it from the liquid chromatography flow path in order to avoid any clogging of the nebulizer
or deposition of substances inside the detector.
For an efficient preventive maintenance:
After each session and before shutting down the chromatography system, the ELSD should be
cleaned in order to ensure good performances.
Preventive maintenance consists in cleaning the detector before shutting down after the last
analyses:
• Let the mobile phase or solvent (recommendation: ethanol) flow to flush particles which
could remain in the detector.
• Eventually increase temperature in order to dissolve possible deposit.
• Stop the mobile phase flowing but let the gas flow at least 30 min to dry to avoid particles
deposit.
• Stop the gas flow.
• Shut down the detector.