Magnetic Field Strength of VP 710 and VP 708 Tumble Stirrers
 
 
Plot of the magnetic field strength versus distance from the Alligator Magnetic Tumble Stirrer deck.

The magnetic field strength (lines of flux per square inch) are as follows: 

On the surface of a 42 Mega Gauss Oersteds (42 MGO) rated magnet,  the magnetic field strength is 13,000 gauss.* This strength falls off quickly as the distance increases.  We try to position the magnet as close to the deck as possible given the constraints of the magnetic cylinders and deck design.  The VP 710F D4 and D6 deck design places the magnetic cylinder closer to the deck than the even more powerful VP 710S so it appears to be stronger at the deck surface.  However it is not able to project this field as far as the VP 710S. 

The MGO rating for the magnets used in the following tumble stirrers are listed as superscripts after the product numbers
(42, 45, or 48 )

 
   
Inches from the deck

Gauss Units at Defined Distances from Deck of each Tumble Stirrer 

VP 710A42 VP 710E42 VP 710F D442 VP 710F D642 VP 710S45 VP 710S-248
0 393 743 1434 1500 1060 1570
6 4 23.5 13 16.9 91 106.8
12 0.2 6.9 3 3.4 19 26.9
18 0.2 3.3 1.6 1.6 6.5 9.7
24 0 2.1 1.3 1.3 2.5 4.5
30 0 1.5 1 1.1 1.5 2.2
36 0 0 0.8 0.9 0.9 1.4

Distance Above Each Deck for 5 Gauss Units in inches and centimeters

5 Gauss 5.5" 13" 9.5" 10" 20" 22"
5 Gauss 14 cm 33 cm 24.1 cm 25.4 cm 50.8 cm 50.8 cm
 
   
Inches from the deck Gauss Units at Defined Distances from Deck of each Tumble Stirrer 
VP 710C42 VP 710C-148 VP 710E-148 VP 710SM42 VP 710SM3P48 VP 710SC45
0 1220.1 1290 1155.0 1012.1 1191.6 1417.0
6 16.3 36.2 35.0 16.4 31.6 97.2
12 3.5 10.5 9.5 3.3 6.8 23.3
18 1.0 5.2 4.2 0.8 2.2 8.7
24 0 3.1 2.5 0 0.8 4.0
30 0 2.0 1.8 0 0.3 2.4
36 0 0.3 0.2 0 0 1.4

Distance Above Each Deck for 5 Gauss Units in inches and centimeters

5 Gauss

11" 18 15" 10" 13.5" 22.8"
5 Gauss 27.9 cm 45.7 cm 38.1 cm 25.4 cm 34.3 cm 57.9 cm
 
 
 
Inches from the cylinder guard Gauss Units at Defined Distances from the cylinder guard of a Vortex Lateral Tumble Stirrer 
VP 708A48
Top (Platter 1)
VP 708A48
Middle (Platter 4)
VP 708A48
Bottom (Platter 6)
0 957 1138 1022
6 23.7 28.1 23.2
12 5.2 5.4 4.8
18 2.0 2.1 1.8
24 0.7 1.2 1.0
30 0 0.8 0.5
36 0 0 0

Distance Above Each Deck for 5 Gauss Units in inches and centimeters

5 Gauss

12.5" 13" 12.5"
5 Gauss 31.75 cm 33.02 cm 31.75 cm
 
 


To put these numbers in perspective from a safety standpoint - the gauss level at the surface of a Qualcomm dual band cellular phone held against your ear is 25 gauss and a Verizon flip cellular phone (LG) is 48 gauss.  Both of these cell phones exceed the magnetic field strength present 7" from the cylinder guard of the of a VP 708A Vortex Lateral Tumble Stirrer. 

*Note that distance between the magnet surface and the surface of the deck varies for each magnetic tumble stirrer design and thus the gauss levels at the surface of the deck varies.  Note that the VP 710E-1, VP 710C-1 and the VP 710SM3P both use the stronger 48 MGO magnets

Note that the VP 710SC (custom) uses a longer magnet than the VP 710S and therefore will project the field farther.

Noted that the magnets used in the VP 710S and VP 710SC are rated at 45 MGO and the VP 710S-2 magnets are 48 MGO.

The Above Graph is also available with a linear scale here

The VP 710A with its multiple magnetic cylinders has less magnetic "bloom" because the adjacent magnetic fields pull it down.

STIR ELEMENT DATA

To see how these gauss reading translate into practical data in Tumbling Stir Elements see the following link.

HEALTH CONCERN

Makers of cardiac pacemakers have placed magnetic switches in them that can be activated when the pacemaker is in a 5 gauss magnetic field.  The critical 5 gauss line varies from 5.5" to 22.8" above the deck or cylinder guard with our stirrers. The graph indicates that the magnetic field falls off very fast with distance.  However as a safety factor we recommend that people with pacemakers keep at least 36" or 91 cm from the Alligator Vertical Tumble Stirrers and the Vortex Lateral Tumble Stirrer.  The cardiac pacemaker company Medtronic has a webpage and pdf that discusses the 5 gauss line in more detail.

 

 
         

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