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The Olis Advantage:
USA Stopped-Flow
Key Features of the U.S.A.
Stopped-Flow
- Deadtime: 1-2 ms for absorbance and
fluorescence (3-5 ms for circular dichroism)
- Average Reagent Volume: 70-120 µl/syringe/shot
Low Volume Design: 40-70 µl/syringe/shot
- Mixer: Berger–Ball
- Pathlength: classic ambient-temperature:
20 mm for absorbance, 10 mm for fluorescence; low-temperature
fluorescence: 4 mm; low-temperature absorbance: 10 mm
- Drive syringes: SGE® glass syringes;
low-temperature syringes also available.
- Valves: ceramic (i.e., fired sapphire)
- Tubing from valves to observation cell:
user’s choice of Tefzel® or stainless steel;
from observation cell to waste syringe: Teflon®.
- Observation chamber: quartz for absorbance
and fluorescence models, stainless steel for low-temperature
model.
- Syringe extenders: PEEK® (polyetheretherketone),
a polymer inert to almost all organic solvents.
- Large, convenient knobs and dials
- Fitted with accessible ports with easy
on/off fitting of water and gas lines to bath chamber
for thermostatting and degassing of bath fluid and exposed
syringe plungers.
- Floodable water bath chamber is made
of Delrin®, a dense (1.56g/cm3) polymer.
- Using syringes of different sizes provides
reagent ratios to 1:11.
- Pneumatic drive system; one plunger
for both syringes; independent movement of syringes and
valves for convenience in filling and flushing.
- Safety interlock system for 100% assurance
against misfiring, active with and without Olis computer
control.
- Anodized cast-aluminum channel (0.5
cm thick) and optical railing (1 cm thick) for high structural
integrity.
- Fail-safe alignment of stopped-flow
observation ports within sample compartment of host spectrometer.
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