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Metal detector BRC minor NC


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#1 QSDA

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Posted 06 August 2018 - 05:54 PM

Hi all

Just had BRC audit and received non-conformance for 'Annually metal detection calibration carried out with bigger metal pieces compare to operational critical limits'

 

MD calibration 2mm, 2mm, 3mm and operations 1,2mm, 1,5mm, 2.0mm, is this significant or are the calibration sizes not important as they are measuring something different.

 

Will contact calibration service but really wanted some insight before doing so

 

thank



#2 FSQA

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Posted 06 August 2018 - 06:22 PM

Hi all

Just had BRC audit and received non-conformance for 'Annually metal detection calibration carried out with bigger metal pieces compare to operational critical limits'

 

MD calibration 2mm, 2mm, 3mm and operations 1,2mm, 1,5mm, 2.0mm, is this significant or are the calibration sizes not important as they are measuring something different.

 

Will contact calibration service but really wanted some insight before doing so

 

thank

Your operating limits are below as compared to the calibration that you are performing under your Annual Metal Detection Program. Since your calibration was done at and >2mm, any detection <2mm (1.2mm, 1.5mm) creates a GAP and a conflict under your Calibration program.

 

Consult your Calibration service and Re-calibrate the detector as per your Operating limits.



#3 Scampi

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Posted 06 August 2018 - 06:23 PM

The sizes AND types are of equal consideration. Both need to be properly calibrated yearly, or more depending on your machine.

 

Putting through larger/different types only proves that the machine recognizes those, not that is is properly registering the actual control bars you are using


Because we always have is never an appropriate response!


#4 redfox

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Posted 07 August 2018 - 02:15 AM

Hello,

 

The size of the specimen must be the size submitted for calibration. How can your MD detects smaller as your test piece, or metal inclusion in your product when you calibrated your MD to bigger size?

 

The uncertainty that your MD can capture target size and smaller is so high.

 

regards,

redfox



#5 012117

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Posted 07 August 2018 - 02:37 AM

Normally, calibration shall be performed withranges that includes plant's operating range. 

 

In the case of metal detector, a change of 0.1mm increment in contaminant size already impact significantly the signal received by the metal detector. If it is the opposite (the test piece you use for verifying your metal detector is lower), then not so much of a problem.

 

Btw, what do you "calibrate" for your metal detector?



#6 Charles.C

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Posted 07 August 2018 - 03:19 AM

Hi all

Just had BRC audit and received non-conformance for 'Annually metal detection calibration carried out with bigger metal pieces compare to operational critical limits'

 

MD calibration 2mm, 2mm, 3mm and operations 1,2mm, 1,5mm, 2.0mm, is this significant or are the calibration sizes not important as they are measuring something different.

 

Will contact calibration service but really wanted some insight before doing so

 

thank

 

Hi QSDA,

 

It would appear yr auditor had definite limitations since BRC do not regard the the MD/operation you have described in OP as "Calibration".

 

See the quote/last attachment/surrounding thread in this post -

 

http://www.ifsqn.com...rs/#entry105910


Kind Regards,

 

Charles.C





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