Operating instructions

Charged Aerosol Detectors
Corona Veo and Corona Veo RS
Page 74 Operating Instructions
5.8 Shutting Down the Detector
5.8.1 Short-term Shutdown
If the detector is not used for a few days, allow the detector to remain connected to the
system, and the detector and system to be turned on. If possible, continue the gas flow. This is
to prevent any build-up of residue from solvents or analyte.
• Keep the detector connected to the system flow path.
• If applicable
Keep the detector connected to the chromatography data system.
• Turn off the mobile phase flow.
• If sufficient gas supply is available, continue to flow gas through the detector with a low
gas flow rate. This is to prevent any build-up of reside from solvents or analytes.
5.8.2 Long-term Shutdown
If the detector is not going to be used for a prolonged period of time, or shipped, observe the
following steps before interrupting operation:
1. Rinse out any solvents from the detector. Flush the detector with a neutral solvent that
does not contain any salts. For information about recommended wash procedures, see
section 8.3.2 (→ page 111). The solvent must be compatible with the mobile phase to
remove all buffers, acidic modifiers, etc. from the detector. Do not leave the detector
exposed for long periods to highly acidic or basic mobile phases.
2. Turn off the mobile phase flow.
3. Allow gas to flow for at least 5 minutes.
4. Turn off the gas flow.
5. Wait several minutes for the detector to de-pressurize.
6. Turn off the gas supply to the detector.
7. Press the power switch on the detector rear panel to turn the detector off.
8. Disconnect the gas tubings from the detector rear panel. With the multi-tool from the
accessories kit for the detector, push in the locking ring on the push-in fittings of the
gas inlet and gas exhaust.
9. Disconnect the power cord from the main power receptacle and all other cables as well
as capillaries from the detector.