Universal / International power supply - This version of
our stir plate ships with a universal power supply. The supply is designed
to run off a range of AC voltages from 110 to 220 at 50 & 60 Hz and comes
with a AC inlet blade set for every major market in the world. Blade sets
include China, Australia, US, UK and Europe.
PWM Technology - 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.
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.
External 12VDC Power Supply Included - By using an external
plug-in 12 VDC 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 Impact Polystyrene Housing - No cheap Radio Shack
project box here. We designed our stir plate to fit inside a commercial
quality polystyrene housing that's 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. As of 12/18/09 we have had zero run-in test failures.
Designed around Neodymium Rare Earth Magnets - No used or surplus
hard drive magnets are used in our stir plates.
Includes 1.2" long Stir Bar - We ship with two 1.2" long X
3/16"
diameter stir bars. We originally started with a 1.5" stir bar
but discovered that a 1.2" long stir bar stays centered on the magnets
better. Also, a 1.2" stir bar seems to work great in a container as small
as a 500 ml flask, as large as a 1 gallon jug or anything in between.
Bright, large power indicator - We did not skimp on the power-on
light - large and 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.
