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ASI QuickSplit

™

Adjustable Flow Splitters

E70

Scientific Instrument Services, Inc.

™

Phone: 908-788-5550

www.sisweb.com/catalog/08/E70

QuickSplit Adjustable Flow Splitters

U

nlike conventional splitters that use long lengths of capillary tubing,
the ASI QuickSplit Adjustable Flow Splitter uses fluid resistors to
achieve a wide range of split ratios. The flow path of the QuickSplit

Adjustable Flow Splitter contains two fluid resistors that form a parallel flow path.
The low flow rate stream passes through a fixed resistor cartridge, while the high
flow rate stream passes through an adjustable fluid resistor (metering valve).
The ratio of these two resistors creates the split flow ratio. The compact fluid
resistor elements are designed as cartridges for easy replacement with resis-
tance values (L2) rated in PSI/mL/min. Because of the extremely low internal
volume of the fluid resistors, the solvent composition in both resistors at any
instant in time is the same, and therefore viscosity changes associated with gra-
dient runs do not impact the split ratio.

Due to the rugged design, the split ratio repeatability is +/- 1 % of setting, and

unlike alternative splitter valves or tees, will not be affected by actions that effect
input flow such as turning the pump off and on, or pressure spikes. Because the
QuickSplit Adjustable Flow Splitter incorporates a metering valve, split ratios can
be changed frequently with flow changes that are stable and reproducible. The
QuickSplit Adjustable Flow Splitter will create split ratios that are not affected by
changes in solvent viscosity or pressure and provides direct real time control
over split ratio optimization.

Schematic flow diagram of the QuickSplit™ Adjustable Flow Splitter

L1 = Adjustable fluid resistor (metering valve)

L2 = Fixed fluid resistor (resistance value varies depending on cartridge rating)

R = Split ration = Q1/Q2 = Resistance ration = L2/L1

Since the flow rate is indirectly proportional to resistance,

changing the resistance in either flow path results in a change
to the split ratio. Changing resistance is accomplished by
adjusting the metering valve on the high flow rate channel or
exchanging the fixed fluid resistor cartridge in the low flow rate
channel with a resistor cartridge which has a different resis-
tance rating. Adjusting the metering valve is analogous to
changing the capillary tubing length or diameter on conven-
tional tee type flow splitters. The QuickSplit Adjustable Flow
Splitter has a convenient mounting bracket and hand adjust-
ment knob to control the split ratio. The split ratio is adjusted
by turning the adjustment knob. Split ratios are increased by
turning the adjustment knob clockwise, and decreased by
turning the knob counter-clockwise. Split ratios are not affect-
ed by changes in solvent viscosities or pressure, which makes
this product suitable for gradient applications as well as iso-
cratic. The QuickSplit Adjustable Flow Splitter is shipped con-
figured for either post-column or pre-column applications.

Resistor - L2

Resistor - L1

Input Flow - Q

Low Flow Rate - Q2

High Flow Rate - Q1

Adjusment Knob
(Controls Adj. Resistor)

Adjusment Resistor

Resistor Cartridge

Split Flow Out (Low Flow Rate)

Split Flow Out (High Flow Rate)

Metering Rod Scale

Inlet Flow

Replaceable Inlet Filter

ASI

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