Test and Measurement

SV Series
Tuning Fork Vibro Viscometers
SV Series Sine-wave Vibro Viscometers  
Viscometry Revolution!
Introduction Video
Application Solutions
Information Library
Development Story
Frequently Asked Questions
PDFBrochure (PDF 1.061KB)
PDFManual (PDF 2,861KB)
PDFManual (additional information) (PDF 132KB)
PDFUser's Handbook (PDF File 1,735KB)
PDFTuning fork vibro method as a Japan industrial standard
              (News flash: July 2011 / PDF 93KB)
interviews and testimonials
Wide-range, continuous measurement without replacing the sensor plates
Simultaneous measurements of temperature and viscosity
Windows Communication Tools WinCT-Viscosity provided as standardz
Easy set up and very quick measurement
Excellent repeatability (1% of the measured value by standard deviation)
Extremely high sensitivity (detects a viscosity as low as 0.3 mPa·s)
Simplified calibration function (for SV-10)
Little interference to the sample fluid
Easy cleaning after measurement
Possible to measure fluids in motion
External Input / Output
RS-232C interface
Click here to see the complete accessory list.
Small sample
container (10ml)
Glass container
(approx. 13ml)
Water jacket Stopper to set
 Example Measurements with the Tuning Fork Vibro Viscometer (SV/SV-A Series)

The SV-10/SV-10A series of tuning fork vibro viscometers are capable of continuous measurement over a range of viscosities from the extremely low (0.3 mPa·s) to the high (10,000 mPa·s).
These viscometers are able to easily measure the state transition from sol to gel as there is no need to change sensors during measurement.
Measurement intervals can be set freely allowing for continuous 24-hour measurement or measurement of any long term viscosity change.

Gel point: The liquid to solid phase change

Example) Gelatin, agar, glucomannan, thickening stabilizer, hydrogel

Cloud point: Micelle structure change in a surfactant

Example) Paraffin, non-ionic surfactants

Suspension: A dispersion system such as a slurry, sludge or colloid

Example) Cement, butter, milk, cream, asphalt, ink, paint, gold nanocolloids

Lubricant Properties: Change in viscosity accompanying temperature change

Example) Engine oil, grease, mineral oil, synthetic oil, water-based lubricants, animal and plant oils

Rapid Rise in Viscosity: Measurement of the curing point (measurement of adhesives)

Example) Egg white/yolk, solder flux, silicone adhesive, mortar, plaster, rubber and polymer adhesives

Low Viscosity Measurement: Stable measurements around 1.0 mPa·s (viscosity, mouthfeel and sensory tests)

Examples) Food related - Water, alcohol, liquors, soft drinks, soy sauce, milk, Medical related - Blood, protein, drugs, easily swallowed foods, easily digested foods Other solvents - cosmetics, semiconductor polishing agents

High viscosity measurement: Stable measurements up to 100Pa·s

Example) Honey, polymer solutions, toothpaste hand creams, lipstick, chocolate

Gel transition / hydrogel measurement      Example) Aqueous gelatin solution

This example shows viscosity measurement of 2.5% and 5% aqueous gelatin solutions over varying temperature.
The horizontal axis shows temperature and the vertical axis shows a logarithm of the viscosity of the aqueous gelatin solutions. There is a clear difference in solidification temperature which is dependent on the concentrations of the aqueous gelatin solutions.

Gel transition

Cloud point measurement      Example) Non-ionic surfactant

This is the result of a measurement taken while a 1% concentration of a non-ionic surfactant was heated. Surfactants become cloudy when they reach a certain temperature. This is called the cloud point and traditionally could only be measured optically.
However, a rapid change in viscosity occurs at the cloud point and this change can be measured with the SV-10A.
From this graph of temperature vs. viscosity we can see that a rapid change in viscosity occurs at 35.4˚C. This temperature is taken as the cloud point. This non-ionic surfactant is defined to have a cloud point at 35.9˚C according to JIS standards, demonstrating that the SV-10A is capable of cloud point measurement.

              Cloud point measurement

Rapid Rise in Viscosity (Measurement of the curing point)      Example) Egg whites

As egg whites are heated to 60˚C their viscosity will decrease like normal liquids. However, once 60˚ is reached viscosity will increase suddenly, as the proteins in the egg whites clump together.
The SV-A series of vibro viscometers can accurately capture small changes specific to a certain substance as well as dynamic changes in viscosity.
As shown in the graph below made with WinCT-Viscosity (RsVisco), viscosity can be displayed as a logarithm allowing for simple, easy-to-understand graphical representation when viscosity change covers a large area or for non-linear changes.

        rapid rise in viscosity

Measurements at low viscosity      Example) Measuring the viscosity of varying concentrations of aqueous ethanol solutions.

The viscosity of varying concentrations of aqueous ethanol solutions at 25˚C was measured with the SV-10A. Viscosity of these solutions was shown to vary with concentration. Alone, both 100% ethanol and 100% water have low viscosities but when they are mixed viscosity increases.

            Measurements at low viscosity
 WinCT-Viscosity data processing software

WinCT-Viscosity is dedicated software that makes realtime graphs of data acquired from the SV Series and SV-A Series viscometers (WinCT-Viscosity supports Windows 8). WinCT-Viscosity allows for simple reading, storage, and analysis of measurement data acquired from SV viscometers. WinCT-Viscosity is comprised of three programs.


RsVisco allows for realtime graphing of data captured from a viscometer. The changing processes of the observed viscosity and temperature can be displayed simultaneously during measurement. Graphs with differing measurement conditions can be overlaid as well.


RsCom transfers data from the viscometer to a computer. It is useful for controlling the viscometer.


RsKey is used to transfer data taken from a viscometer to other software.

Graphing with WinCT-Viscosity (RsVisco)

1. The time axis: Track variation over time
2. Identify temperature dependency: Find a correlation between temperature and viscosity
3. Focus on specific values: Easily select min and max values for the X/Y axes
4. Convert to Excel file: Convert a file with a CSV extension to Excel for preparing documents

Example) Engine Oil

1. Variation over time
2. Temperature dependency

Engine oil

Example) Thickening Agent

1. Overall numerical value change
2. Using min/max to focus on specific values

Thickening agent

It is possible to expand a designated section of the X and Y axes. Double click to overwrite the value.
Example) Expansion of the viscosity range between 80-100mPa·s for the first three minutes of measurement.
→ Double click the maximum value (shown as 30 on the graph) of the X axis (time) and enter 3.
→ On the y axis (viscosity) double click the minimum value (shown as 0 on the graph) and change to 80, double click the maximum value (shown as 500) and change to 100.
⇒ A graph of the designated area will be displayed.

Expand the graph
Model SV-10 SV-100
Measurement Method Tuning Fork Vibration Method (Natural Frequency at 30Hz)
Viscosity Measurement Unit mPa·s, Pa·s, cP, P Pa·s, P
Viscosity Measurement Rang 0.3~10000mPa·s 1~100Pa·s
Repeatability 1% of Reading (S.D., 20~30°C, No condensation)
Minimum Sample Amount 10ml~ (with Optional Small Sample Cup)
Temperature Measurement 0~160°C / 0.1°C(32~320°F/0.1°F)
Display Vacuum Fluorescent Display (VFD)
Power Supply AC Adaptor (Approx. 14VA)
External Dimensions / Mass Main Unit (with Stand): 332 (W)×314 (D)×536(H) mm / Approx. 5.0 kg
Display Unit: 238 (W)×132 (D)×170(H) mm / Approx. 1.3 kg
Standard Accessories Sample Cup (45 ml, Polycarbonate × 4 pcs), CD-ROM (WinCT-Viscosity),
AC Adaptor, Connection Cable (1.5m), RS-232C Cable (25P-9P)

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