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  Measurement, Test and Calibration
  LAb Envirnoment control

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Author Topic:   LAb Envirnoment control
JRKH
Forum Contributor

Posts: 10
From:Cincinnati, Ohio
Registered: Apr 2001

posted 14 June 2001 03:21 PM     Click Here to See the Profile for JRKH     Edit/Delete Message   Reply w/Quote
For QS 9000 Does the temp and humidity gages have to be controlled and calibrated?

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DICKIE
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Posts: 46
From:Romulus, MI, USA
Registered: Feb 2001

posted 14 June 2001 03:40 PM     Click Here to See the Profile for DICKIE   Click Here to Email DICKIE     Edit/Delete Message   Reply w/Quote
If you are performing calibrations your environmental insturments must be calibrated. The uncertainty of the environmental insturments is also a component of the combined measurement uncertainty and must be reported by whoever calibrates them.

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Al Dyer
Forum Wizard

Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 14 June 2001 08:25 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
Also remember that if a product is brought into a controlled lab environment it must be held and stabilized.

If a metal part is brought in from a production floor that is 95 degrees it should be held in the "controlled" environment to ensure that the normal expansion and contrtaction, due to temp change, is minimized.

I'm not sure where they are, but there are tables that can convert temperature expansion/contraction rates to reduce the "hold time" required for proper inspection.

Help from the Lab people please!

ASD...

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Graeme
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Posts: 30
From:Lilburn, GA, USA
Registered: Sep 2000

posted 14 June 2001 08:29 PM     Click Here to See the Profile for Graeme   Click Here to Email Graeme     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by JRKH:
For QS 9000 Does the temp and humidity gages have to be controlled and calibrated?

I assume the temperature and humidity gages are used to monitor those parameters in an area where work is done. To repeat the question often asked by Phil Stein, "Does it matter if those measurements are wrong?" In other words, do variations in temperature and humidity affect the quality of the work being done there? If the answer is "Yes", then calibrate the instruments. If the answer is "No", then why are you making the measurements at all?

Note that this principle applies generally to all test and measuring instruments ...

------------------
Graeme C. Payne
ASQ Certified Quality Engineer
ASQ_Graeme@yahoo.com

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