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Siwarex R type K - measuring drift

Created by: Abyrne at: 6/17/2009 11:21 AM (5 Replies)

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6/17/2009 11:21 AM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 12/8/2023 Posts: 101 Rating: (4)	Hi, I am looking at an application involving Siwarex R load cells. I am looking for any information on how to measure, predict and control drift in these cells. The serial numer for the cell is 526 962-05 Thanks for your help

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6/17/2009 4:31 PM	Rate (0)
Siwarexi Gold Expert Joined: 1/4/2007 Last visit: 12/5/2024 Posts: 1153 Rating: (175)	Dear Abyrne, Do you know the order number of your load cell? I can't do anything with the serial number. Which Siwarex module are you using (Siwarex CS, FTA, ...)? If I have these information, I can calculate for you the permitted drift of the scale. I look forward to hearing from you. Best regards Siwarexi

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6/17/2009 5:04 PM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 12/8/2023 Posts: 101 Rating: (4)	Thanks for the help Siwarexi, The load cell used is 7MH3105-2AB0 The Module is Siwarex U 7MH4950-1AA01 The maximum load on the cell would be 2000L (0.78t)

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6/18/2009 9:59 AM	Rate (0)
Siwarexi Gold Expert Joined: 1/4/2007 Last visit: 12/5/2024 Posts: 1153 Rating: (175)	Dear Abyrne, The permitted drift of the scale is, if you have 1 load cell: 3.13 kg The permitted drift of the scale is, if you have 2 load cells: 8.4 kg The permitted drift of the scale is, if you have 3 load cells: 15.14 kg Attached you can see the formula. GLC = Fcomb = 0.1% (load cell) GAWG = 0.05% (Siwarex U) Best regards Siwarexi Attachment formula.JPG (260 Downloads)

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6/18/2009 5:58 PM	Rate (0)
Abyrne Bronze Member Joined: 11/26/2008 Last visit: 12/8/2023 Posts: 101 Rating: (4)	Hi Siwarexi, Thanks for the information you sent me on calculating drift. I just have a few more questions.... How did you calculate the first 3 results to give a Kg result? Am i correct in saying the formula gives an answer as a % of error? I also would like to know how drift is calculated with respect to time... i.e. what % of drift is there over a 1 or 2 year period?

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6/19/2009 12:17 PM	Rate (0)
Siwarexi Gold Expert Joined: 1/4/2007 Last visit: 12/5/2024 Posts: 1153 Rating: (175)	Dear Abyrne, To your questions: How did you calculate the first 3 results to give a Kg result? My answer: I used the formula “formula.jpg”, which you can see into my last reply. Your question: Am i correct in saying the formula gives an answer as a % of error? My answer: No, the result is in kg. This kg-value is valid from an unloaded load cell up to the nominal load of a load cell. Attached you can also have my Excel-sheet for the calculation. Your question: I also would like to know how drift is calculated with respect to time... i.e. what % of drift is there over a 1 or 2 year period? My answer: The drift is valid for the life cycle of the load cell. If the load cell has a higher drift, the load cell is damaged, you have mechanical problems (like bypass forces, frictions, ...) or the wires of the load cell cable are not connected correctly. Best regards Siwarexi Attachment error_limit.zip (242 Downloads)

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