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B–8
Model 3480 Electrospray Aerosol Generator
P
DIFFERENTIAL
PRESSURE
REGULATOR
ROTAMETER
ROTAMETER
FILTER
FILTER
FILTER
FILTER
ORIFICE
ORIFICE
EXHAUST
TO
IONIZATION
CHAMBER
TO
PRESSURE
CHAMBER
(ACROSS CAPILLARY TUBE)
AIR
IN
CO
2
IN
Figure B-3
Electrospray Flow Schematic
The differential pressure regulator is used to maintain the pressure
drop across the Electrospray capillary; therefore, if the flow rates of
the air and CO
2
into the Electrospray chamber are changed, the
capillary pressure drop will not change. The high pressure tap for
the pressure gauge is connected to the output of the pressure
regulator, which is at the same pressure as the pressure chamber.
The low pressure tap is connected in the same orientation as the
air/CO
2
mixture inlet to the ionization chamber, which is
immediately upstream of the capillary tip.
The orifice leading to the pressure chamber is used to allow the
quick-release pressure chamber bottom to be removed without
changing the position of the differential pressure regulator knob.
The exhaust orifice is used to provide “bleed” and “relief” features to
the differential pressure regulator. This increases the regulator
stability and responsiveness by keeping the regulator in a dynamic
state. It also provides a quicker exhaust when the regulator output
pressure exceeds the set point pressure.
The air and CO
2
rotameters provide separate controls for each flow
before the flows are mixed together immediately upon exit of the
rotameter. The filter provides a final clean of the sheath flow as well
as a means to mix the air and CO
2
thoroughly before the entrance
to the ionization chamber.