SEO DST 30 Series User manual

Surface & Electro-Optics Corporation
Released 2014. 05
Version
6.0
DST 30 Series
Surface Tension Meter
Administrative
Guide

Surface & Electro-Optics Corporation
Administrative Guide
Copyright ã2000 All rights reserved by SEO
This is reprinted 2001.5
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For safe and effective use
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Table&of&Contents&
Released 2014. 05 ................................................................................................................ 1
FOR SAFE AND EFFECTIVE USE ........................................................................................ 4
1. HARDWARE SET-UP (DST 30 MANUAL TYPE) ......................................................................... 7
1.1 BASIC ITEMS INCLUDED WITH THE DST 30 ................................................................................ 7
1.2 COMPONENTS AND CONTROL ELEMENTS .................................................................................. 8
1.3 CONDITIONS OF INSTALLATION ............................................................................................... 9
1.4 INITIAL DST 30 SET UP ..................................................................................................... 10
2 OPERATION ..................................................................................................................... 14
2.1 CLEANING THE DU NOÜY RING ........................................................................................... 14
2.2 LOADING THE SAMPLE ....................................................................................................... 15
2.3 MEASURING SURFACE TENSION BY THE DU NOÜY RING METHOD................................................ 16
2.3.1 Surface Tension Result by Ring Method ....................................................................... 19
2.4 MEASURING SURFACE TENSION BY THE WILHELMY PLATE METHOD ............................................. 20
2.4.1 Surface Tension Result by Plate Method ..................................................................... 23
2.5 MEASURING INTERFACIAL TENSION ...................................................................................... 24
2.5.1. Interfacial Tension Result .......................................................................................... 26
2.6 CMC (CRITICAL MICELLE CONCENTRATION) MEASUREMENT ..................................................... 27
3 CALIBRATION..................................................................................................................... 28
3.1 CALIBRATION PROCEDURE .................................................................................................. 28
4 THEORY OF SURFACE TENSION ............................................................................................ 30
4.1 DU NOÜY RING METHOD ................................................................................................... 30
5 CONDITIONS INFLUENCING SURFACE TENSION ................................................................ 31
5.1 T EMPERATURE ................................................................................................................. 31
5.2 T IME ............................................................................................................................. 31
5.3 D ENSITY ......................................................................................................................... 31
5.4 SURFACE CLEANING .......................................................................................................... 31
5.5 PURITY OF LIQUID ............................................................................................................. 31
5.6 SURFACE ROUGHNESS AND PORE SIZE ..................................................................................... 31
5.7 INFLUENCE OF ADSORPTION ................................................................................................ 31
5.8 V IBRATION ...................................................................................................................... 31
6 COMPANY INFORMATION ................................................................................................ 28
6.1 ADDRESS & PHONE NUMBERS ............................................................................................. 28
6.2 SERVICE INFORMATION ...................................................................................................... 28
Warranty ........................................................................................................................... 28

6

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1. Hardware Set-up (DST 30 Manual Type)
Diagram & Installation $
1.1 Basic items included with the DST 30
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No. Description Quantity$
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No. Description Quantity
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1.2 Components and Control Elements
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1.3 Conditions of Installation
A. Environmental conditions$
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B. Attention$
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1.4 Initial DST 30 Set up
A. Set up the DST 30 system on a stable, anti-vibration table.$
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B. Unlock the “Shipping Lock Bolt”.
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C. Undo the Thumbscrew. $
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D. Open the top door.$
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E. Open the wall window of the DST 30.$
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F. Remove the wrench bolt. $
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G. Turn the handle to lower the sample stage. $
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H. Remove the aluminum shipping support stick.$
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I. Level the instrument with the leveling legs at the base of the instrument.$

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J. Insert the ring into the in-line Hanger.
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K. Place the in-line Hanger onto the weight beam.

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2 Operation
2.1 Cleaning the Du Noüy Ring
A.$Remove the Du Noüy (Pt-Ir) ring from the in-line Hanger.
B.$Clean the Du Noüy ring carefully using an appropriate solvent.
C.$Lightly flame the Du Noüy ring over a blue flame from an alcohol burner.
D.$To properly flame the Du Noüy ring, hold over the flame for only a few seconds on the
round edge.
E.$This should be done carefully! Do not allow the flame to crack or melt the edges as this will ruin
the ring resulting in unreliable measurements.
F.$After a few passes through the flame on the round edge of the ring, allow the ring to cool to
room temperature for two or three minutes prior to measurement.
G.$Replace the ring into the in-line hanger.

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2.2 Loading the Sample
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2.3 Measuring Surface Tension by the Du Noüy Ring Method
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2.3.1 Surface Tension Result by Ring Method$
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2.4 Measuring Surface Tension by the Wilhelmy Plate Method
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