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  #1  
Old 1st June 2005, 02:15 PM
DuaneG DuaneG is offline
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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.
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Old 1st June 2005, 02:54 PM
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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.

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Old 1st June 2005, 04:12 PM
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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.

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Old 2nd June 2005, 12:53 AM
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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.

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Old 2nd June 2005, 10:24 AM
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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
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Old 10th June 2005, 02:11 AM
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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
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Old 14th June 2005, 10:18 AM
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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
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Old 15th June 2005, 12:18 PM
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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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