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Stir plate keeps throwing stir bar

 
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KB




Joined: 06 Nov 2014
Posts: 334
Location: Virginia

Working on: Next brew


PostLink    Posted: Sat Jul 29, 2017 7:16 pm    Post subject: Stir plate keeps throwing stir bar Reply with quote


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I'm using the Fermentap Magnet Stir Plate from MoreBeer. Worked fine with a 2L flask.

Needed a larger starter for a lager so used a 5L flask with a little bit more than 2L liquid. The stir plate keeps throwing the stir bar.

Is the stir plate too small for a 5L flask?

If not, what size (length) stir bar is recommended for a 5L flask with the stir plate?

Thanks.
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kal
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Joined: 12 Dec 2010
Posts: 11116
Location: Ottawa, Canada

Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter


PostLink    Posted: Sat Jul 29, 2017 8:01 pm    Post subject: Reply with quote

Not sure myself as I've not used that stir plate. Have you asked the manufacturer? They'd probably be the best to offer suggestions. The specs at MoreBeer do say it can be used with a 5L flask. It may be stir bar dependant however.

You may have to run it slower too with a 5L flask. Ramp up the speed slowly.

Kal

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Ozarks Mountain Brew




Joined: 22 May 2013
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PostLink    Posted: Sun Jul 30, 2017 12:04 am    Post subject: Reply with quote

some brands of flasks have a high spot in the middle, which doesn't let the stir bar spin in the middle so it wanders then throws, I bet thats it
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siestakey




Joined: 10 Mar 2017
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PostLink    Posted: Sun Jul 30, 2017 2:19 am    Post subject: Reply with quote

Were you using a wide stir bar? I was having trouble when I moved up to a 5L flask with the wide stir bar. Unless it is a large starter (3L or more) i usually use the small "normal" sized stir bar.
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KB




Joined: 06 Nov 2014
Posts: 334
Location: Virginia

Working on: Next brew


PostLink    Posted: Sun Jul 30, 2017 12:49 pm    Post subject: Reply with quote

Ozarks Mountain Brew wrote:
some brands of flasks have a high spot in the middle, which doesn't let the stir bar spin in the middle so it wanders then throws, I bet thats it


I purchased the 5L flask from a homebrew supply. Other than the overall size, the bottom is identical to my 2L flasks.
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KB




Joined: 06 Nov 2014
Posts: 334
Location: Virginia

Working on: Next brew


PostLink    Posted: Sun Jul 30, 2017 12:50 pm    Post subject: Reply with quote

siestakey wrote:
Were you using a wide stir bar? I was having trouble when I moved up to a 5L flask with the wide stir bar. Unless it is a large starter (3L or more) i usually use the small "normal" sized stir bar.


No, normal width, as far as I know, stir bar. Looks like a pill.
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kal
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Posts: 11116
Location: Ottawa, Canada

Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter


PostLink    Posted: Sun Jul 30, 2017 12:57 pm    Post subject: Reply with quote

Try a shorter stirbar possibly. Longer isn't always better.

Kal

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dp Brewing Company




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PostLink    Posted: Mon Jul 31, 2017 12:18 pm    Post subject: Reply with quote

kal wrote:


You may have to run it slower too with a 5L flask. Ramp up the speed slowly.

Kal


This was the case for my last stir plate. You just had to find the sweet spot.

kal wrote:

Try a shorter stirbar possibly. Longer isn't always better.

Kal


Also great advice.

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kal
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Joined: 12 Dec 2010
Posts: 11116
Location: Ottawa, Canada

Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter


PostLink    Posted: Mon Jul 31, 2017 12:48 pm    Post subject: Reply with quote

For what it's worth, I tend to mostly use my 1-3/8" stir bars all the the time, on both 2L and 5L flasks. Most have a ridge in the middle. As mentioned by others, make sure the flask is flat in the center bottom. Some are not and you'll never get it to work right.

Kal

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