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  Measurement, Test and Calibration
  Laboratory Process Control

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Author Topic:   Laboratory Process Control
Real Gagne
Lurker (<10 Posts)

Posts: 1
From:Quebec City, Qc, Canada
Registered: Jan 2001

posted 03 January 2001 05:34 PM     Click Here to See the Profile for Real Gagne   Click Here to Email Real Gagne     Edit/Delete Message   Reply w/Quote
According to QS-9000 3rd edition, we have to monitor the environmental conditions of our "In-House laboratory". We are a small company (about 70 employees) and we need an equipment to mainly monitor the temperature and humidity. We are doing basic inspections (calipers, micrometers, dial indicators) and we don't want to spend thousands of dollars for this equipment. Do you have suggestions (equipment specifications)?


Real Gagne

[This message has been edited by Real Gagne (edited 03 January 2001).]

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Jerry Eldred
Forum Wizard

Posts: 136
Registered: Dec 1999

posted 03 January 2001 05:42 PM     Click Here to See the Profile for Jerry Eldred   Click Here to Email Jerry Eldred     Edit/Delete Message   Reply w/Quote
The popular low-budget option is a temperaure and humidity chart recorder with LCD readout, detachable hygrometer probe (which I recommend, due to its ease of calibration - you'll find vendors to calibrate more readily than those without that probe). The vendors that come to mind are Omega Engineering, Dickson, Honeywell, Vaisala, General Eastern, ASL Inc. I am not advertising for any of them, and will refrain from trying to sell any of their specific units. If you want more detailed reply on that, please feel free to email me separately, and I'll try to give you some information.


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David Mullins
Forum Contributor

Posts: 248
From:Adelaide, South Australia, Australia
Registered: Nov 1999

posted 03 January 2001 05:43 PM     Click Here to See the Profile for David Mullins   Click Here to Email David Mullins     Edit/Delete Message   Reply w/Quote
Dare I say - a wet & dry bulb thermometer!
Should give you about $985 change from one of those thousands.


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Forum Contributor

Posts: 244
Registered: Sep 1999

posted 04 January 2001 08:59 AM     Click Here to See the Profile for Sam   Click Here to Email Sam     Edit/Delete Message   Reply w/Quote
David, glad you said it first; That's exactly what I have used in the past. Works great.

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Ken K
Forum Contributor

Posts: 44
From:Wisconsin, USA
Registered: Jun 2000

posted 10 January 2001 06:40 AM     Click Here to See the Profile for Ken K     Edit/Delete Message   Reply w/Quote
If you have access to a Fisher Scientific catalog, there are numerous listings for gages that will help you monitor lab conditions. Most of them are traceable to NIST standards.

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Ryan Wilde
posted 31 January 2001 10:05 AM           Edit/Delete Message   Reply w/Quote
Originally posted by David Mullins:
Dare I say - a wet & dry bulb thermometer!
Should give you about $985 change from one of those thousands.

I have no familiarity with QS9000, but I do know that in the language of standards, monitor means "record". Therefore, the wet/dry bulb does not meet that requirement, unless someone performs a documented check every 10 minutes 24/7. The reasoning is simple - rate of change is by far more important to dimensional calibration than is the actual temperature. If your lab is turned down to say 60F at night to save power, then turned up upon arrival, and it gets up to 73F within an hour or so, you've added 13F of uncertainty (Heretofore known as "slop") to any measurements you make.

Doesn't seem like much? Let's use a 24" set of calipers. In simple mathematics, the growth rate of 52100 steel is 6.4in/in/F. Therefore, 6.4E-6in * 24in * 13 = 0.0019968, or about 0.002" of possible "slop" that you've introduced. Last time I checked, the tolerance of a set of 24" calipers was 0.002".

I doubt that your lab is at this extreme, but the standard is just asking you to document, and therefore prove it.


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