No wear, no maintenance, higher precision stirring of even the smallest volumes, constant speed, even when the viscosity changes, and ultra-flat design - all these features are possible with this drive concept.
What is so special about VARIOMAG stirring systems? The secret of the patented magnetic stirrers is hidden in the drive. Conventional magnetic stirrers use an electrical motor spinning a permanent magnet, thus exerting a force on the magnetic stirring bar within the stirring vessel. In VARIOMAG magnetic stirrers, electrical motors and permanent magnets are replaced by stationary magnetic coils through which currents flow, producing a rotating electromatnetic field. A digital electronic circuit coordinates the currents supplied to the coils. It re-calculates and controls currents up to 1000 times a second.
To demonstrate our full confidence in the reliability of our magnetic stirring systems, we offer you a two-year warranty on all defects in material or workmanship.
A stirring point consists of four drive coils. This square configuration means that each coil can be used as driving element for up to four stirring points. A network can therefore be established with very few coils, and almost any configuration of stirring points can be realized. Since all the stirring points operate synchronously, the overall multiple configuration is self-stabilizing. Fully synchronized speeds ensure 100% comparability of samples. This is an important innovation that proves very useful in mass screenings.
As a result of continuous research and development, the VARIOMAG concept led to the groundbreaking multiple stirring concept.
As in conventional magnetic stirrers, the stirring functions such as speed are set right at the front of the device. Direct control of the magnetic stirrer sense if the unit is used directly where the user works and if the device should not take up more than absolutely necessary of the bench-top space, which is always at a premium anyway. To provide safe low voltage to these devices, a power supply unit is always included.
For many applications it appears to be useful to separate the stirring unit from the control unit. This means that the stirring unit - known as stirring drive - is controlled by an external control unit that is in charge of various stirring functions such as speed or stirring power. The control cable transfers the stirring power to the stirring drive. Incidentally, all devices operate on safe low voltage. Consider applications in a water bath. Most of our remotely controlled TELESYSTEM stirring drives are waterproof and can be submersed directly into the water bath. This means that the bottom of the water bath no longer intervenes between the stirrer and the stirring vessel and now optimizes the mixing effect. To be able to operate these devices, the control unit must be an external one. The same is true for stirring in large vessels. Here, too, keeping the heavy devices on the ground while operating the control unit at the bench, where it is conveniently located, appears to be an ergonomically sensible approach. Or consider integrated approaches, where our magnetic stirrers are integrated in analytical devices, and the stirring functions are controlled. together with all the other functions, from one central unit. And in these cases the magnetic stirrers are frequently firmly integrated and inaccessible, so that setting the speed directly would not even be possible.
