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  Measurement, Test and Calibration
  Calibration of Process Equipment Gages, Etc.

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Author Topic:   Calibration of Process Equipment Gages, Etc.
Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 03 July 1998 06:31 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I ran across this on the ISO9000 listserve and thought it might provide some 'food for thought'. I always run into this type of situation and each one in different. My last client manufactured semi-conductors - it was *fun* figuring out what should be calibrated and what was not 'critical' and 'why'.:

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From: Karri Bost Subject: RE: Calibration/Silvestri/Bost

I have run into a similar issue with injection molding machines in my job. We had a requirement from QS9000 that we interpreted as saying that any piece of measurement equipment that may affect the quality of the product should be maintained and calibrated. We therefore hired a calibration lab to calibrate these temperature and pressure gauges. This in turn doubled our calibration costs. The approach we take to set-up of the injection molding machines is with a set-up sheet (recording temp and pressure), and we found this to be much more reliable from machine to machine once they were all calibrated to a known standard. In the long run of this issue, we have found that the process technicians are spending less time processing to produce a quality product, so the calibration has basically paid for itself.

Once we figured out just what the calibration lab was doing for calibration, we decided that we could maintain calibration ourselves. We are buying a temperature simulator and a pressure deadweight tester. If you hook the temp simulator up to the thermocouple, see if it's reading correctly.

Anyway, the moral to my story is that we found the calibration of these instruments a useful and time saving tool.

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