Thermo Scientific VH-D20 Operating Manual page 135

Preparations
Follow these steps
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual
1. Flush the detector with the detector gas flow being turned on. For
recommendations on flushing the detector, see
Detector Between Analyses
2. Turn off the pump flow and then the gas flow:
a) Turn off the pump flow to the detector. Wait at least 5 minutes.
During the waiting period, the detector drains any remaining
mobile phase to waste.
b) Turn off the gas flow on the detector.
c) Wait until the system pressure is down to zero before you
continue.
d) Turn off the gas supply to the detector.
3. Turn off the detector with the main power switch.
1. With the screwdriver, loosen and remove the top screw on the
protective cover for the gas filter assembly.
Figure 29: Gas filter assembly with protective cover
No. Description
1 Top screw on protective cover
2 Protective cover
3 Bottom screws (slightly loosened)
4 Gas filters
7 • Maintenance and Service
Flushing the
(} page 124).
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