• Choose either a Servo Motor Drive or Pneumatic Cylinder Drive System.
• Fluorescence - Absorbance Cells
• Sample Loading
• Double Mixing Experiments
• Fluorescence Anisotropy!
• Software and Computer Control
• Data Analysis
• Specifications
• Prices
• Download SF-2004 Brochure

Alternatively, the researcher can now choose the SF-2004-AF Pneumatic Stopped-Flow. This instrument utilizes a computer-controlled pneumatic drive cylinder. The pneumatic drive cylinder forces the mixing of reactants against a stopping syringe. A set of solenoid valves and a small drive cylinder function together to automatically empty the stop syringe after each shot so that repeated or sequential mixing can be performed with ease, completely under software control. All other aspects of the SF-2004 Pneumatic Stopped-Flow offer the same high quality components as our SF-2004.

For ease of use and to help in the expulsion of air bubbles, the SF-2004 series of stopped-flows use a solid vertical drive mount. This arrangement places the sample syringes in a position where they are easy to load and to observe through the transparent water jacket during the course of an experiment. Various sample chambers can be easily interchanged or removed for cleaning

A choice of four observation cells is available and each provides not only optimal fluorescence measurements but also unique features, which can greatly improve data, collection under different conditions. All four cells can record either absorbance or fluorescence or both simultaneously. An optional CCD array detector allows spectra to be recorded every msec for truly outstanding performance.

The SF-2004 series of KinTek stopped-flows have a guaranteed dead time of less than 1 msec. View the data! With its precision, high torque servo motor drive, the performance of the SF-2004 is repeatable and reliable year after year. The SF-2004 also has excellent performance reliability due to the precision manufacturing of all parts and with proper care will give many years of service. Some of our observation cells use Berger Ball mixers to provide efficient mixing with minimal back-pressures. In others, we use our proprietary microjet mixers. In both cases, test reactions have proven that mixing is completed in the KinTek stopped-flow before the sample enters the cell.

The KinTek stopped-flow comes with three drive syringes. In the normal mode of operation, only two syringes are connected and used to drive the mixing of two reactants. Alternately, the third syringe can be connected to perform a double mixing experiment. Two reactants are mixed and then flow into a delay line. The motor then stops for the desired reaction time and then on the next push, the solution is mixed with the third reactant and forced into the observation cell. The reaction time is under precise computer control, allowing reactant times as short as 5 msec and up to many minutes. Double mixing experiments allow new experiments to explore reaction mechanisms that cannot be accomplished with other commercially available instruments.

The SF-2004 can be easily and economically equipped to perform fluorescence anisotropy measurements. A second optional PMT is added to the instrument along with an easy to use filter set and the instrument becomes an optimal anisotropy instrument. Check out the data!

Don't buy a stopped-flow using an outdated computer system. With the KinTek SF-2004 you get the world-wide standard DELL PC and have access to the wealth of computer programs for data analysis and presentation. The SF-2004 system software allows data to be easily exported to other programs in ASCII spreadsheet format - at the click of a mouse!

The KinTek SF-2004 is entirely under computer control, making the operation of the instrument easy and convenient to use. The computer controls the instrument drives system, the detector gain and checks to see that the sample load valve is in the right position. It is also programmed to assist in a simple calibration of the instrument. The instrument and software have been integrated into a system that is easy and convenient to use, leaving the operator free to concentrate on the data collection and analysis.

Data can also be fit by computer simulation directly to the reaction mechanism by global fitting methods using KinTekSim.

Data can also be easily exported for import into the data fitting and graphics presentation program of your your choice.