---
title: Why Calibrate a CSC DuNouy Tensiometer?
description: We are asked many questions in a  category related to  Calibrating duNouy Ring Tensiometers. See the Video
image: https://www.cscscientific.com/hs-fs/file-15554128-jpg/images/tensiosmall.jpg
---

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# CSC Scientific Blog

A blog about test equipment

## [Why Calibrate a CSC DuNouy Tensiometer?](https://www.cscscientific.com/csc-scientific-blog/why-calibrate-a-csc-dunouy-tensiometer) Posted by

[Art Gatenby](https://www.cscscientific.com/csc-scientific-blog/author/art-gatenby) on Sep 13, 2011 11:14:00 AM

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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:![CSC duNouy Ring Tensiometer](https://www.cscscientific.com/hs-fs/file-15554128-jpg/images/tensiosmall.jpg?width=89&height=117&name=tensiosmall.jpg)

- To see if the **Tensiometer** is working.

- To determine if it is working correctly

- Because it gives a reference for ISO traceability

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:

- Set up the Tensiometer so  the indicator is on the “0” line in the mirror and the dial reads Zero. Like a **Seesaw**![Tensiometer Calibration with Seesaw](https://www.cscscientific.com/hs-fs/file-15551118-jpg/images/teeter_todder__ralph-rachel.jpg) or **Teeter** **Totter**, in balance with equal sized kids (**Ralph** and **Rachel**) on either side. The ring (**Ralph**) on “**teeter**” side and the arm (**Rachel**) on the “**totter**” side.

- Now we add a known weight to the ring which pulls down the indicator. (We hand **Ralph** some free weights).

- We now turn our dial until the indicator goes back to Zero. (We give **Rachel **some stones until until it balances again).

- At this point we apply a magical formula that lets a wizard tell us what the dial should read if everything is in correct balance.

- We reconcile any difference between that number and the dial reading by adjusting the arm length. Thus, the wizard says **Ralph** should have more weights or that **Rachel** should **move in or out** on her side of the “**totter**” until the Seesaw balances again.

- Now we know that for a given weight, along with **Ralph’s** and **Rachel’s** specific position, the seesaw will be in balance. In other words, we know how much force will be needed to move the dial by one dyne. This magical formula makes the translation of the weight added to the number the dial should read.

We have a short video that shows how this calibration process works. You can get to it by clicking on the bubble.

 [![Click me](https://no-cache.hubspot.com/cta/default/75757/e130c48f-155a-4e46-8932-da51a371de67.png)](https://cta-redirect.hubspot.com/cta/redirect/75757/e130c48f-155a-4e46-8932-da51a371de67)

![duNouy Tensiometer Calibration Formula](https://www.cscscientific.com/hs-fs/file-15492246-jpg/images/csc_tensiometer_calibration_formula_-2.jpg?width=198&height=84&name=csc_tensiometer_calibration_formula_-2.jpg) I had fun putting this together and  hope it simplified understanding of  the tensiometer calibration process (except for the magical formula the basis of which is a designer’s secret).

Let me know what your interests are and we'll try to rail about them. You can do this by commenting below or by emailing me at artgatenby@gmail.com

I thank you for following my rants.

A befuddled as usual,

Art

P.S.  Hope you enjoyed meeting **Ralph** and **Rachel**.  By the way sign up and subscribe to our **Test Equipment Rants**.

 Topics: [duNouy Rings](https://www.cscscientific.com/csc-scientific-blog/topic/dunouy-rings), [Tensiometer](https://www.cscscientific.com/csc-scientific-blog/topic/tensiometer), [Surface Tension Measurement](https://www.cscscientific.com/csc-scientific-blog/topic/surface-tension-measurement), [Surface Tension](https://www.cscscientific.com/csc-scientific-blog/topic/surface-tension), [Calibration](https://www.cscscientific.com/csc-scientific-blog/topic/calibration), [Interfacial Tensiometer](https://www.cscscientific.com/csc-scientific-blog/topic/interfacial-tensiometer), [Fisher Tensiomat](https://www.cscscientific.com/csc-scientific-blog/topic/fisher-tensiomat), [Liquid Properties](https://www.cscscientific.com/csc-scientific-blog/topic/liquid-properties)

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