Thermo Scientific VH-D20 Operating Manual page 116

6 • Operation
Page 116
Situation after Shutdown
Device shall be
transported or shipped
after shutdown
Make sure that residual sample components, impurities from the
column or buffers are completely removed from the detector.
TIP As an intermediate solvent, you can use 100% methanol to flush the
charged aerosol detector.
3. Turn off the pump flow and then the gas flow:
a) Turn off the pump flow to the detector.
b) Wait at least 30 minutes. During the waiting period, the detector
drains any remaining mobile phase to waste.
NOTICE—Damage to the detector
Turning off the gas glow too early may result in condensation and, thus,
to deterioration of detector parts and/or flooding.
Wait for at least 30 minutes before you turn off the gas flow to the
detector.
c) Turn off the gas flow on the detector.
d) Wait until the system pressure is down to zero before you
continue.
e) Turn off the gas supply to the detector.
If no additive is used
Flush the system with
isopropanol.
Charged Aerosol Detectors (VH-D20, VF-D20)
If an additive is used
Flush the system first with
several volumes of
methanol and water
(50:50) (for example,
1.0 mL/min for
10 minutes with the
standard system) to
prevent salt buildup in the
fluidics. If the solvents in
the device are not
miscible with water, use
an appropriate
intermediate solvent.
Afterward, flush the
system with isopropanol.
Operating Manual