2 replies to this topic

[dekel poliva]

We have magnets in-line. When inspector comes to test the magnets he gives a report with gauss measurments.

i am looking for a chart that could trnaslate distance,gauss and material so i could use it as a validation for the HACCP.

How do you validate your magnets without contamination the line with metals?

 

[GMO]

Material is obviously only ferromagnetic metals or metal alloys with a significant ferromagnetic quantity. It won't work on all metals let alone all materials. The efficacy will depend on size, location of the magnet, weight of the contaminant. I would never use a magnet as a CCP because you cannot directly say "it will pick up xx mm size of mild steel" because it depends how far away it is from the magnet, is the magnet over or under the flow? Are there other materials between the contaminant and the magnet? How often are they cleaned and checked (as they are notorious for having debris build up and dump back in.)

 

Rather than think of "what does this magnet remove?" I'd flip it. If anything, it's verification of other processes you have in place including PPMs, hygiene clearance and I'd always have a metal detector after it. So while it's possible some metals will be removed by a magnet, it's not certain (and not even close to certain if I'm honest). BUT what it can do is give you an early warning that something is wrong upstream. 

[SHQuality]

We have magnets in-line. When inspector comes to test the magnets he gives a report with gauss measurments.

i am looking for a chart that could trnaslate distance,gauss and material so i could use it as a validation for the HACCP.

How do you validate your magnets without contamination the line with metals?

I agree with GMO. Metal detectors are notorious for harbouring build up of metal debris. I would expect that when the magnets were originally installed, it was done based on the experience of the magnet's manufacturer. I would look for that validation report and see what it actually validates in your specific environment.

 

The magnet is not going to work as a CCP, but it will still contribute to the overall management of hazards if you can find out its effectiveness against ferric contaminants.