r/Metrology • u/Old_Ad_501 • 4d ago

Torque Experts!

Hello all! Wanted to ask some insights from those who torque calibration experience. Our torque sensor and torque analyzers have always been calibrated as a system- together. When calibrating the sensor, vendor will use our analyzer. But our most recent calibration, we noticed they used a different analyzer not ours. And sensor failed at all test points with consistent bias across the range. Does the different set up could have caused this? Not sure why they used a different analyzer. Thanks in advance!

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u/Ok_Loan6535 4d ago

Yup.  The calibration adjustments are stored in the readout.  Did you send in the readout with the sensor? 

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u/Old_Ad_501 4d ago

We did as always so not sure why they calibrated it with different analyzer. We had to open an investigation, and the coordinator is giving us the unit was mishandled and needs replacement talk.

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u/Old_Ad_501 3d ago

They agreed to take it back and recalibrate, but here's the weird thing. They say it's OOT. But the as found data doesnt look consistent with a drift. All test points were around +.25 OOT even the smallest test point. Based on my experience, if its normal drfit it should start low then increases as the load increases but this is pretty fixed. What do you think? If it's broken we need to know so we can take it off

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u/WorldlinessThick5547 4d ago

If it’s an AKO sensor you need to send out the head unit with it.

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u/Old_Ad_501 4d ago

It's a BMX Mountz sensor. We always send them out together but they calibrated the sensor and analyzer separately.

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u/Old_Ad_501 4d ago

Analyzer is PTT 2000

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u/RinTinTimTom 1d ago

I'm pretty sure BMX transducers store cal factors.  With a constant .25 error it's possible it was zeroed before exercising.  

It's possible the gain on one of the indicators is off but I wouldn't think its show up as a constant error across the range.