Stopped flow (rapid mix) accessory, SFA-20
For the Cary 50, 1, 3,
100 and 300 instruments.
Note: For use with the Cary 4, 5, 400, 500,
500i, 4000, 5000 and 6000i instruments please contact
your local Varian office.
The Hi-Tech Scientific SFA-20 series of rapid kinetics accessories
may be used in conjunction with the Cary spectrophotometers. The
accessory has an empirical deadtime <8 ms, allowing reaction
rates of up to 100 s-1 to be monitored.
The latest high precision, research grade, gas-tight syringes are
used and are available in volumes from 250 µL to 5 mL. Variable
ratio mixing applications are readily accommodated since the syringes
are mounted outside the thermostatically controlled sample circuit,
allowing easy and rapid replacement. This also prevents any possibility
of leaks at low temperatures.
The syringes are mounted on a rigid drive platform
ensuring that the flow is stopped precisely and instantaneously.
This platform and the syringe mounting blocks are extremely resistant
to chemical attack. The thermostatted sample circuit itself is constructed
from materials which also provide optimum chemical resistance. Reagents
travel in this inert sample circuit through an umbilical cord to
the flow cell where they are mixed by a high efficiency T-format
mixer.
Options for the SFA-20
include:
•An anaerobic kit to extend the use of the SFA-20 to applications
where oxygen must be excluded.
•Various trigger units to automatically initiate measurements
as the flow is stopped. One option also provides a digital readout
of the thermostatted temperature.
•A pneumatic drive attachment for enhanced shot-to-shot reproducibility.
•A conductivity cell and detector is also available allowing
stopped-flow conductivity experiments to be performed using the
SFA-20 drive unit.
SFA-20M Rapid Kinetics
Accessory - Microvolume Version
The SFA-20M is a microvolume version of the standard accessory.
With a dead volume of just 350 µL per reagent, it is ideally suited
to leading edge research where only small quantities of novel or
expensive materials are available.
SFA-20mx Rapid Kinetics
Accessory - Multi-Mixing Version
The SFA-20mx incorporates two mixers separated by a 10 µL delay
loop. This enables two reagents to be mixed prior to a third reagent
being introduced and mixed immediately before the observation chamber.
SFA-20mxM Rapid
Kinetics Accessory - Microvolume Multi-Mixing Version
The SFA-20mxM combines the benefits of microvolume operation with
multi-mixing capabilities.
Ordering Information
Description |
Part number |
SFA-20 Varian.
Note: Multi-Mixing and Micro-volume versions of this accessory
are available on request. |
7910030400 |
| Mounting bracket to hold SFA-20 for Cary 1, 3,
100 and 300. Not required for Cary 50 or Cary Eclipse. |
7910030500 |
Specials
Special versions of the SFA-20 are available on request. Applications
include:- T-Jump, High and Low Temperature and X-Ray.
The SFA-20 Varian is manufactured by Hi-Tech Scientific and may be
purchased from them directly if desired. Their contact details are
as follows:
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