VP 767-2 & VP 758-3

In order to stir magnetic beads you can not use any method that employs magnetism, magnetic drives or magnetic clutches because the beads will be attracted to them and taken out of solution.  As magnetic beads have become more popular in a variety of assays, a non-magnetic method to keep them uniformly  suspended is required. It is also important to use a method and reservoir that does not have "fall out zones" places where the bead fall out of solution.  The "fall out zone" problem is a difficult one for those stirrers that use a propeller blade approach as the corners of those reservoirs are "fall out dead zones".   Similar problems are found in the corners of mixers that use ultrasound to mix beads.

The VP 767-2  and VP 758-3 with its' sealed drive shaft eliminates the need for magnetic clutches or drive magnets and the design of the Bubble Paddle Reservoir takes care of the "fall out zone".  Problem solved!  The pipet depressions on the bottom of the reservoir also reduces the waste of these precious reagents.

The reservoirs come standard in;
economical Delrin (VP 758-3)
in autoclaveable Polypropylene (VP 758-3P) and in autoclaveable PTFE (VP 758-3PTFE)

Over all Reservoir Specifications:
109 mm long, 51 mm wide, 42 mm tall
Reservoir depth = 32 mm**
Reservoir volume = 50 ml
Dead volume = 3 ml

Over all Reservoir and Motor Specifications:
284 mm long, 78 mm wide and 72 mm tall.

The sealed drive shaft is subject to wear.  The degree of wear is determined by the material being stirred and the length of the stirring time.   The seal should not be operated dry.  Although you will get hundreds of hours of operation before the seal fails we have provided a simple replacement sealed drive shaft (VP 758-3S).  This  unit is simple enough that it can be replaced in the field so there is no down time.  The photo above illustrates the double O-rings used to attach the unit to the reservoir.  The photo to the right illustrates the custom Bal Seal used to seal the drive shaft.  The unit also contains 2 bearings to keep the shaft true and reduce wear on the Bal Seal.  

The photo to the right shows the Magnetic Stirrer being used on an Apricot Designs TPS-384 robot.

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Viscous Liquid Mixer

VP 758-4PP

Improved polypropylene reservoir with ducted bottom for 8 pipettes including aluminum paddle with 9 bubbles and double sealed drive shaft. Mixes 125ml.

The VP 767M  and VP 758M are miniature versions of the VP 767-2 and the VP 758-3.  They were designed to be compatible with the Innovadyne Nanodrop for magnetic bead dispensing.  The VP 758M uses a similar sealed drive shaft as the VP 758-3 and the bubble paddle and pipet depressions on the bottom of the reservoir are  identical to the VP 756CM-P thus combining the best of both worlds to produce uniform suspensions of magnetic beads with very low dead volumes.

Reservoirs come standard in autoclaveable Polypropylene (VP 758M) with an inlet and outlet nipple.

Over all Reservoir Specifications:
141 mm long, 23 mm wide, 23 mm tall
Reservoir depth = 16 mm
Reservoir volume = 15 ml
Dead volume = 1.2 ml

Over all Reservoir and Motor Specifications:
253 mm long, 27 mm wide and 26.2 mm tall.

VP 769 / VP 759

The VP 769 and VP 759 with its' sealed drive shafts eliminates the need for magnetic clutches or drive magnets and the design of the Bubble Paddle Reservoir takes care of the "fall out zone".  Problem solved!  The pipet depressions on the bottom of the reservoir also reduces the waste of these precious reagents.

The reservoirs come standard in;
economical Delrin (VP 759) in autoclaveable Polypropylene (VP 759P) and in autoclaveable PTFE (VP 759PTFE)

The motor/drive systems are also available in a 230 volt 50 hz CE complaint version (VP 769CE).

Motor Gear Drive

The latest in our line magnetic bead stirrers is the VP 759 Bubble Paddle Reservoir and the VP 769 Motor/gear drive.  This system made for 96 robot pipetting systems is shown in the photo to the right on the deck of a PerkinElmer EP3.  This system is designed to fit on one of the corner positions.  The least impact on deck positions (one deck position) required is when the system is located on either the upper right hand corner or the lower left hand corner.  Two deck positions are required when it is placed in the lower right as illustrated in the photo or in the upper left.  Three deck positions are required if the installation is on an edge position.   

The photo to the right illustrates the motor and gear system of the VP 769 in its rotated up position.  We have designed the system so alignment pins (not shown) on the bottom of the base plate register with registration holes used on the EP3 to locate microplate tiles.    The base plate has two alignment pins which register and locate the VP 759 Bubble Paddle Reservoir so the pipetting points are the same as a 96 well microplate.  The adjustment screw in the lower right is for setting the degree of tooth engagement on the gears.    

Over all Reservoir Specifications:
 mm long,  mm wide,  mm tall
Reservoir depth = mm**
Reservoir volume =  ml
Dead volume =  ml

Over all Reservoir and Motor Specifications:
 mm long,  mm wide and  mm tall.