Appropriate Test Environments for In-Glass Liquid Thermometer Calibrations

J

Joe UMass

#1
I am attempting to calibrate an in-glass liquid thermometer. NIST Special Publication 1088 gives very specific directions for creating an appropriate ice bath for ice point calibration. I would also like to calibrate at the boiling point and I am looking for similar directions to create a heated water bath. Does the shape, volume, and material of the flask matter? I assume I should use distilled water with a stir bar. Any advice or direction is greatly appreciated.
 
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BradM

Staff member
Admin
#2
Re: Thermometer Calibration-appropriate test environments

Welcome to the Cove!! :bigwave:

I believe I got this document here. I looked (at the very top of this web page; in a box labeled post attachments list) but could not find it. I must not have had the name correct.

Anyway, this assists in building the appropriate manner.


Also, you might want to purchase this standard:

Designation: E 1 – 05
Method 9501—Federal Test
Method Standard No. 791b

Standard Specification for

ASTM Liquid-in-Glass Thermometers
1


You will want to take note if you have full/partial immersion and such.

As far as your boiling water, there are some things to consider; primarily in how uniform the water is, how close to the heat source, etc. Once you achieve you set point, you may want to place your standard in and observe the insertion depth.

Not sure how many thermometers you have, but if you have a number of them, it might justify spending the money to get a cool/heat recirculating calibration source. They are not cheap, but they are so nice and reliable.

Again, welcome. :)

 

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J

Joe UMass

#3
Re: Thermometer Calibration-appropriate test environments

Thanks for the quick response. I had already read the pdf that you posted and like the other NIST publication I had cited, it only gives guidelines for building an ice bath. I just calculated the boiling point at my elevation (99.6 C) and my previous attempt at making a water bath was pretty darn close! So maybe I'm on the right path. I have one in-glass liquid thermometer that I hope to use as a reference to calibrate the various digital thermometers in the lab, but first I want to be confident that this thermometer has been calibrated correctly. Again I appreciate any advice on hot bath design.
 
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