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Metal Detector Frequency and Verification


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rewel

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Posted 19 August 2020 - 06:03 AM

Hi all,

 

New to metal detectors as I came for the beverage industry.

 

I am just after some thoughts.

 

Currently our checks on the metal detector are every 4 hours and i feel that is a very long time. Can i ask, what time frames others have.

 

Is it just a matter of how much product you need to hold and rework if there is a fail?? or is there a direct method that will tell you the required frequency. They appear to have no justification as to why it is every 4 hours.

 

Lastly, we have it calibrated annually and as mentioned above checked every 4 hours by the operators. should there be another internal verification/validation between calibration periods or whats the recommended practice?

 

Cheers,

Rob



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Posted 19 August 2020 - 06:19 AM

It depends on what type of food safety standard you follow.

 

We are BRC Food and do at least 4 checks during an 8 hour shift. One at the start, two during and one at the end of each shift.

Also if there's some type of change in production (either packaging or raw material).

 

I guess it's the minimum, both in terms of BRC standard regulation and time to do it. I mean, the staff do have other things to do as well  :shades:

 

We do an annual calibration and this seems to be sufficient.

Talk to your equipment provider and discuss if it's neccessary to increase calibration.



Charles.C

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Posted 19 August 2020 - 09:17 AM

Hi all,

 

New to metal detectors as I came for the beverage industry.

 

I am just after some thoughts.

 

Currently our checks on the metal detector are every 4 hours and i feel that is a very long time. Can i ask, what time frames others have.

 

Is it just a matter of how much product you need to hold and rework if there is a fail?? or is there a direct method that will tell you the required frequency. They appear to have no justification as to why it is every 4 hours.

 

Lastly, we have it calibrated annually and as mentioned above checked every 4 hours by the operators. should there be another internal verification/validation between calibration periods or whats the recommended practice?

 

Cheers,

Rob

Hi Rob,

 

It's an amazingly popular question. Many threads place the last factor in set below as the major determining factor.

 

Standard is unknown but, if BRC, frequency recommendation should consider -

 

•  start-up and nish of shifts
•  product changeovers
•  change in machine settings following downtime for repairs
•  customer requirements
•  regular checks throughout production (these should consider the site’s ability to recover and retest product in the event of a failure; therefore a minimum of hourly testing is typically expected)

 

.[despite Post 2,  I would personally have thought a minimum frequency should be once per hour ]

 

V.slightly off-query but also see -

 

https://www.ifsqn.co...ks/#entry163407

 

Last part of OP mixes together calibration, checking, validation and verification. Some clarification as to meaning is required. Offhand, 2nd = 4th. 3rd = sensitivity = Prelim. set-up. 1st = "arbitrary" but typically annually.


Kind Regards,

 

Charles.C


Ms Salad

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Posted 19 August 2020 - 11:33 AM

Hi Rob,

 

First the Metal Detector and Xray machines are externally calibrated annually;

Second, QA team validates all the Metal Detector and Xray machines annually;

Last, the line operators calibrate the MD and Xray the first thing before production starts. 

We check products every half hour. 

 

hope it helps.

 

Cheers

 

Donna



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Posted 19 August 2020 - 11:40 AM

We run checks based on volume and what would be investigation and recovery time back to being in production again.

 

Our standard is every 2 hours.


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Glenn Oster
 
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rewel

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Posted 20 August 2020 - 05:03 AM

Thanks every one for your replies.

 

The standard is FSSC 22000 which I'm new to.

 

I agree that at a minimum it should be hourly. Which i am going to introduce, probably with much push back from production.

 

Thanks again.



rewel

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Posted 20 August 2020 - 05:22 AM

Further to my inquiry. When validating before production do you start product let it get to the metal detector than test the first product or just put the test piece on the conveyor belt?

 

Thanks in advance. 



Charles.C

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Posted 20 August 2020 - 06:39 AM

Further to my inquiry. When validating before production do you start product let it get to the metal detector than test the first product or just put the test piece on the conveyor belt?

 

Thanks in advance. 

 

I assume you are referring to a normal Production run.

 

This is (typically) verification, not validation.

 

There is a "multiple" procedure involved which should be time implemented as noted Post 3. Procedure Includes axial belt positioning of test sample(s), grouping of test sample, MD rejection capability..


Kind Regards,

 

Charles.C


redfox

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Posted 20 August 2020 - 07:32 AM

Hello rewel,

 

We are producing pasteurized crab meat and BRC certified. Our frequency of MD verification is every 30 mins. The advantage is, if the machine fail on the verification, you have only 30 mins of product that you have to recall/recheck.

 

Hope it could help.

 

regards,

redfox






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