New*** Now with Bottom Light - Our new SP-3000L stir plate is just like our SP-3000 model with one exception - the new stir plate incorporates a high intensity white LED bottom light to illuminate your yeast culture any time you want to see what's going on. The light is turned on with a push button switch on the back and will stay on as long as you hold the switch in. We do not let the light stay on because high intensity LED generates some heat and leaving the light on would warm up your yeast culture.
Larger Platform - The top measures 8” wide by 7” front to back, more than large enough to safely support a 5 or 6 liter starter. Our original stir plate only measures 5" X 5", too small to safely support a starter over 2 liters. Other than the stir plates stuffed into cheap food containers that support a questionable amount of weight, we don't believe any of the low cost competition has a platform close to the size of ours.
Improved Electronics but still PWM Technology - Our new design runs even more efficiently than our original controller with less losses through the entire circuit. PWM (Pulse Width Modulation) technology is a better solution than a regulator based controller - PWM allows better motor speed control with less wasted energy. This means no heat from the stir plate box that could raise your yeast culture temperature higher than expected. Our latest design makes no noticeable noise, even without a flask in place but you will still get some stir bar rattle. You will get some stir bar rattle with all stir plates.
Low Power Consumption - PWM also means less power consumption. Regulator based stir plates waste a lot of energy - if the speed control set to half, 1/2 the energy is used to drive the motor while 1/2 the energy is turned into waste heat. And if the speed control set to one quarter, 1/4 the energy is used to drive the motor while 3/4 the energy is turned into waste heat. With a PWM system, power is fed to the stir plate motor in varying widths of full-on - full-off pulses. For 1/2 speed, the pulses are 1/2 on & 1/2 off. For quarter speed, the pulses are 1/4 on & 3/4 off. And because power is always all the way on or all the way off with PWM, there is no waste heat.
Low Profile, Compact Design - Measuring just over 2.5" high and just over 8" width and 7" depth, our low profile case has a wide firm footing. This plus the 4 skid resistant rubber feet makes knocking your stir plate off the counter much less likely than other "cheap stir plates".
Larger, higher torque 0.4 amp motor - The motor used in this stir plate is large enough to spin a 6 liter starter but can still spin a starter as small as 250 ml.
External 12VDC Power Supply Included - By using an external plug-in 12 VDC, 500 MA power supply, we moved one more potential source of heat away from the stir plate. This also makes the power supply user replaceable in the unlikely case that it should fail.
Professionally Designed - All of our controller cards are professionally designed using state of the art PCB design and layout software.
Professionally Manufactured - Built on commercial quality double sided 0.062" FR4 PCB's with 1 ounce copper and full solder mask on both sides. The same quality construction you will find in any high-end electronics equipment.
Tough, High Strength Polystyrene Housing - No cheap Radio Shack project box or disposable food container here. We designed our stir plate to fit inside a commercial quality polystyrene plastic housing with heavy aluminum end plates that are strong enough to support any flask that will sit on the box.
100% Tested Product with 24 hour run-in - 100% of our stir plates are tested and 10% of our stir plates are run with 2000 ML Borosilicate Glass Erlenmeyer Flasks of water for 24 hours before shipping.
4X Larger Neodymium Rare Earth Magnets than our original - To ensure coupling between the drive magnets and stir bar, even in jars with convex bottoms, we designed this stir plate around rare earth magnets that are 4X stronger than the ones used in our original stir plate.
Includes two 1.2" long Stir Bars - We assumed that we would need a longer stir bar but this just wasn't the case. Just like with our original stir plate, a 1.2" stir bar seems to work best in a container as small as a 250 ml flask, as large as a 1 gallon jug and anything in between. We also we ship this stir plate with two 1.2" long X 3/16" diameter stir bars.
Brighter, larger power indicator - Our original stir plate uses a 5 mm power indicator light. We used the same light on the prototype but it looked funny. So we spent a little extra on a larger 10 mm power indicator light and it's definitely bright enough to see from across the room.
Linear speed Control & Control Range that you can Use - We designed the speed control in such a way that the entire adjustment range is useable. Some other controllers are set-up so that the top 3/4ths to 2/3rds of the adjustment range is too fast. With these other stir plates, only the bottom 1/3rd to 1/4th of the adjustment range is useable, making speed adjustment too sensitive. Our stir plate is designed to give the user full adjustment range. Note: Even with our adjustment range, some settings will be too fast or too slow for some flasks.
To order, please select the correct power supply for your stir plate then press "Add to Cart".