EXTRACTION FLOW ADJUSTMENT
The System 48-II Pressure Processor has a two-level gas delivery system used to
pressurize the SPE columns.
One part of the system is controlled by the rotameter located on the left side of
the instrument panel. By switching the “SPE FLOW RATE” selector to the left,
“ADJUST FLOW” setting, the gas is delivered to the SPE Column Manifold
through the ADJ FLOW regulator and then thru the rotameter which is controlled
by the needle valve located at its base. The rotameter route provides a very
precise slow flow through the SPE columns by limiting the gas flow to the
manifold from 0 to 2.5 SCFH.
NOTE:
The rotometer needle valve is for adjustment only and is NEVER to be used as
an on off valve. Use the selector valve to turn off the nitrogen flow.
The second part of the gas delivery system provides for rapid gas flow to the
manifold which is controlled by adjusting the regulator located below the
pressure gauge labeled “MAX FLOW.” The pressure range is 0-80 psig and is
used to maximize flow through the SPE columns for processing viscous or high
particulate samples or to dry the columns in situ. By switching the “SPE FLOW
RATE” selector to “MAX FLOW”, gas is introduced to the manifold at the
pressure set on the “MANIFOLD PRESSURE” regulator as indicated by the gauge
located directly above it.
By turning the “SPE FLOW RATE” selector to off, no gas will flow to the manifold;
it should be in the off position when decompressing the column set between the
various SPE method operations.
Note that the regulator is of the “locking” type. The regulator can be adjusted by
pulling out on the regulator knob. Once the desired pressure is set, it can be
“locked in” by pushing in on the knob.
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