Measurement Uncertainties Budget for Thermometer

#1
Hello all,

I am trying to create uncertainty budgets for our calibration equipment at our facility. I am new to creating these and was wondering if I could get some advice on the following:

Lets say I want to create an uncertainties budget for a thermometer. I want to use the thermometer in various environments (ovens, water baths, etc). Should I perform repeatability tests for use in both medias (air and water) since they will have differing results depending on it, and add each results to the uncertainty, or would adding both results be over estimating the uncertainty of the thermometer?

Thank you
 
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indubioush

Quite Involved in Discussions
#2
How would a thermometer have different results from air or water?

Usually, statement about equipment accuracy come from the manufacturer.
 
#3
I was under the impression that equipment accuracies from the manufacturer would be considered a Type B uncertainty, whereas performing a statistical analysis, such as repeatability, would be Type A uncertainty, which is what I am referring to.

I plan on using this thermometer in both air and water mediums. Just curious if I should perform analysis in both mediums or if one is sufficient.
 

dwperron

Trusted Information Resource
#4
You are correct about Type A vs. Type B.
Tell me about the thermometer.
Liquid in glass? If so, is it full or partial immersion?
Or is this a temperature probe connected to a temperature meter?
 

dwperron

Trusted Information Resource
#6
It is a temperature probe connected to a temperature meter.
Doing repeatability in both media is a good idea. The RTD elements in probes come in different sizes, and may not be totally immersed in liquids, so that thermal wicking can occur. Not so much a problem in air unless you are only inserting the probe tip into a chamber.

Combining the uncertainty contributors is a philosophical question. Many normalize the results and combine them RSS, this is legitimate. Others take the more conservative approach of adding the contributors together, giving you a "worst case" uncertainty. In your case I think I would have two separate uncertainties for liquids and air (if there is a difference...) instead of combining them. That would exaggerate your uncertainty budget.
 
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