Jump to content

  • Quick Navigation
Photo

Magnet Strength Testing


  • You cannot start a new topic
  • Please log in to reply
10 replies to this topic

Omoware

    Grade - AIFSQN

  • IFSQN Associate
  • 31 posts
  • 0 thanks
2
Neutral

  • Canada
    Canada

Posted 15 December 2021 - 08:02 PM

Hi all,

 

I am checking our magnet for the second time after we bought it. The strength is a little bit higher than the initial strength I got the first time I checked. Has anyone experienced this before? Could it be that it was not done correctly in the first check? Or is it that the Gauss meter is not doing a correct job? Just wondering....Any input will be greatly appreciated.

 

Thanks!



Charles.C

    Grade - FIFSQN

  • IFSQN Moderator
  • 19,502 posts
  • 5408 thanks
1,342
Excellent

  • Earth
    Earth
  • Gender:Male
  • Interests:SF
    TV
    Movies

Posted 15 December 2021 - 09:37 PM

Hi all,

 

I am checking our magnet for the second time after we bought it. The strength is a little bit higher than the initial strength I got the first time I checked. Has anyone experienced this before? Could it be that it was not done correctly in the first check? Or is it that the Gauss meter is not doing a correct job? Just wondering....Any input will be greatly appreciated.

 

Thanks!

10,000 and 10,001 gauss ?

 

Some detail might be helpful.


Kind Regards,

 

Charles.C


Omoware

    Grade - AIFSQN

  • IFSQN Associate
  • 31 posts
  • 0 thanks
2
Neutral

  • Canada
    Canada

Posted 16 December 2021 - 02:10 PM

10,000 and 10,001 gauss ?

 

Some detail might be helpful.

Thanks Charles!

 

The first time I checked the strength it was 10331 g and the second time is11021 G (3 months from the first check). I just want to know if this is normal. I believe the strength should be decreasing and not increasing.



Snickerdoodle

    Grade - Active

  • IFSQN Associate
  • 4 posts
  • 1 thanks
0
Neutral

  • United States
    United States

Posted 17 December 2021 - 12:28 AM

I just did our annual magnet validation and we use third party contractor. He was comparing the results from last year and this year's results and it's kind of like you stated, it was a little bit higher compared to last year. He explained that if magnets are  hot or cold to the touch, it does affect the reading sometimes. It should be cold to the touch not hot. Note that we are a chocolate manufacturing company and the only way to clean the magnets is to wipe it with hot towel. 



Omoware

    Grade - AIFSQN

  • IFSQN Associate
  • 31 posts
  • 0 thanks
2
Neutral

  • Canada
    Canada

Posted 17 December 2021 - 02:01 PM

10,000 and 10,001 gauss ?

 

Some detail might be helpful.

 

 

I just did our annual magnet validation and we use third party contractor. He was comparing the results from last year and this year's results and it's kind of like you stated, it was a little bit higher compared to last year. He explained that if magnets are  hot or cold to the touch, it does affect the reading sometimes. It should be cold to the touch not hot. Note that we are a chocolate manufacturing company and the only way to clean the magnets is to wipe it with hot towel. 

 

 

I just did our annual magnet validation and we use third party contractor. He was comparing the results from last year and this year's results and it's kind of like you stated, it was a little bit higher compared to last year. He explained that if magnets are  hot or cold to the touch, it does affect the reading sometimes. It should be cold to the touch not hot. Note that we are a chocolate manufacturing company and the only way to clean the magnets is to wipe it with hot towel. 

Thanks!

 

Probably that's why might results are higher too. We also use chocolate as ingredients which makes it very hard to clean the magnet with cold water. Is it normal to get some metal shavings when passing milled chocolate (Chocolate powder) through the magnet. Some times I get some small rings of metal filings all around the magnet. I'm still trying to find the root cause and solution to that.



Snickerdoodle

    Grade - Active

  • IFSQN Associate
  • 4 posts
  • 1 thanks
0
Neutral

  • United States
    United States

Posted 17 December 2021 - 06:15 PM

We see iron dust in our magnets and I believe that's normal. But not pieces of  metal shavings. I would alert the supplier if that is the case or inspect the line.  



AltonBrownFanClub

    Grade - MIFSQN

  • IFSQN Member
  • 68 posts
  • 22 thanks
22
Excellent

  • Earth
    Earth
  • Gender:Male
  • Location:The Midwest
  • Interests:I collect vintage clothing and shoes. I also enjoy restoring old cars.

Posted 21 December 2021 - 09:48 PM

Some times I get some small rings of metal filings all around the magnet. I'm still trying to find the root cause and solution to that.

 

A professor of mine used to work with chocolate, cocoa powder specifically. He told us they used magnets to remove metal dust from the raw cocoa.

Their root cause was the hardness of dried beans causing wear on grinders and other equipment.

 

Maybe YOUR process isn't introducing the metal. Might be something to test on incoming shipments. I apologize if this is not relevant, but without knowing your process this was the first thing that came to mind.



Omoware

    Grade - AIFSQN

  • IFSQN Associate
  • 31 posts
  • 0 thanks
2
Neutral

  • Canada
    Canada

Posted 22 December 2021 - 04:06 PM

We see iron dust in our magnets and I believe that's normal. But not pieces of  metal shavings. I would alert the supplier if that is the case or inspect the line.  

Thanks for letting me know it is normal to get iron dust. I think that's what I see, not pieces of metal.



Omoware

    Grade - AIFSQN

  • IFSQN Associate
  • 31 posts
  • 0 thanks
2
Neutral

  • Canada
    Canada

Posted 22 December 2021 - 04:07 PM

A professor of mine used to work with chocolate, cocoa powder specifically. He told us they used magnets to remove metal dust from the raw cocoa.

Their root cause was the hardness of dried beans causing wear on grinders and other equipment.

 

Maybe YOUR process isn't introducing the metal. Might be something to test on incoming shipments. I apologize if this is not relevant, but without knowing your process this was the first thing that came to mind.

Thanks for your input. I will continue to monitor the process.



PQEdwards

    Grade - AIFSQN

  • IFSQN Associate
  • 25 posts
  • 2 thanks
3
Neutral

  • United Kingdom
    United Kingdom

Posted 05 January 2022 - 08:23 AM

Hi

In my experience not unusual to see some variation in strength readings between testing. The grate magnets i am familiar with are actually a number of magnets fastened together in rod, so there are peaks and troughs in the strength down the bar (hence why the metal dust collects in rings at regular intervals)

 

Consistently finding the same point of peak strength down the magnet is a bit of an art. Ultimately confirming the magnet it meets the minimum strength criteria and there is no clear ongoing degradation in strength or condition is probably more important. Also of course there will be some accepted analytical uncertainty associated with the test instrument which will impact upon the consistency of the magnet.  

 

Regards

John



Omoware

    Grade - AIFSQN

  • IFSQN Associate
  • 31 posts
  • 0 thanks
2
Neutral

  • Canada
    Canada

Posted 05 January 2022 - 02:19 PM

Hi

In my experience not unusual to see some variation in strength readings between testing. The grate magnets i am familiar with are actually a number of magnets fastened together in rod, so there are peaks and troughs in the strength down the bar (hence why the metal dust collects in rings at regular intervals)

 

Consistently finding the same point of peak strength down the magnet is a bit of an art. Ultimately confirming the magnet it meets the minimum strength criteria and there is no clear ongoing degradation in strength or condition is probably more important. Also of course there will be some accepted analytical uncertainty associated with the test instrument which will impact upon the consistency of the magnet.  

 

Regards

John

Thanks John!






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users