Within the catalog of questions we are asked is a category related to Calibrating duNouy Ring Tensiometers. The subject matter ranges from how, why and what is proven?
I guess the immediate and wise-assed answers are:
Some of the calibration schemes pertain specifically to the unique design of the CSC Tensiometer and its application of torsion balance concepts.
Our tensiometers determine vertical force by measuring the twist or torsion in a wire. Starting from an equilibrium point where our scale dial is at zero:
1. We pull a duNouy ring through a liquid surface
2. This twists the wire as it resists the surface tension force and
3. We measure the amount of twist or torsion in the wire needed to pull the ring completely through the surface.
A calibration procedure is needed to produce a measurement in accepted units of surface tension (dynes/cm), as well as obtaining a reading that relates to a traceable measure or value. Thus, the real answer is all three of the above; the Tensiometer is working, working correctly and the results are traceable.
I shall describe the procedure which assures that a test reading is accurate.
The procedure goes as follows:
We have a short video that shows how this calibration process works. You can get to it by clicking on the bubble.
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I thank you for following my rants.
A befuddled as usual,
Art
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