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Temperature and Humidity requirements for a Calibration Laboratory


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  Post Number #1  
Old 1st June 2005, 02:15 PM
DuaneG

 
 
Total Posts: 5
Please Help! Temperature and Humidity requirements for a Calibration Laboratory

What are the requirements for a calibration lab regarding temperature and humidity. Our room is so cold because they are worried about humidity. I want to give them numbers. Our average is 64 degrees and 28% humidity.
thanks

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  Post Number #2  
Old 1st June 2005, 02:54 PM
D.Scott's Avatar
D.Scott

 
 
Total Posts: 1,592
Duane - your lab should function under controlled conditions suitable for performing the tests/calibrations on your scope. Check the specs. you are working to and see if there are specific requirements.

Dave
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  Post Number #3  
Old 1st June 2005, 04:12 PM
CarolX's Avatar
CarolX

 
 
Total Posts: 2,169
Duane, I moved your thread to this board for better response to your question. I suggest you scroll to the bottom of the page for links to similar threads.
  Post Number #4  
Old 2nd June 2005, 12:53 AM
Hershal's Avatar
Hershal

 
 
Total Posts: 2,464
DuaneG,

The Recommended Practices (RPs) available from NCSLI (National Conference of Standards Laboratories - International) provide some guidance on lab environmants. http://www.ncsli.org

Generally the guidelines for dimensional: 20 C +/- 2 C, 30% to 40% RH.
Electrical/electronic: 23 C +/- 3 C, 40% to 50% RH.

Hope this helps.

Hershal
Thanks to Hershal for your informative Post and/or Attachment!
  Post Number #5  
Old 2nd June 2005, 10:24 AM
JerryStem's Avatar
JerryStem

 
 
Total Posts: 269
Our requirements were dictated by the equipment we use. They have specs like 10-100% humidity and 0-100 degrees Celsius. Basically, it didn't matter! (Mostly X-Ray Fluorescence and Beta Backscatter coating thickness instruments).

We set our specs at reasonable levels we could achieve by normal AC and heating, 60-80F and 20-80% RH. We have temp/humidity gauges that can be adjusted/calibrated by traceable standards but since we don't NEED it, we stopped having them certified. We mainly keep them to record the numbers on our certs because customers expect it.

Jerry
  Post Number #6  
Old 10th June 2005, 02:11 AM
nitram

 
 
Total Posts: 7
Hi Jerry,
Keep in mind that the humidity levels recommended is due to:
1. Corrosion risks increase above 55% RH .
2. Electrostatic discard (ESD) risks increase below 35%RH .


I hope that I'm not misinformed ;-).

Martin
  Post Number #7  
Old 14th June 2005, 10:18 AM
W. de Jong's Avatar
W. de Jong

 
 
Total Posts: 26
Weigh the influences

Hi,

If the lab is not a controlled environment then you should examine the influence of the factors on your testresults. Take the factor into account in the uncertainty calculation. If the weight factor is very high you should take out the risk by controlling that factor. e.g. What we did for atmospheric pressure: measurements showed an atm. pressure of 1018 12 hPa in a timespan of a year. The actual influence of the pressure was not a big contribution to the uncertainty of our method of analyses.
Validated it with test results and there was/ is no problem. We don't have to control the atm. pressure. Same with ambient temperature, saved us the cost of an airco.

BR, Wouter
  Post Number #8  
Old 15th June 2005, 12:18 PM
Giselle

 
 
Total Posts: 11
Duane,

for dimensional measurements 20C (68F) is nominal, you need to evaluate what types of measurements you are making, Chrome/Steel (gage blocks) expand and contract at a rate of 6 microinches per inch of material per degree C. If your measurments aren't any better than 0.00001, then you should be fine at that temperature, but it does sound a little chilly.
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