Viscometers
Benchtop
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Anton Paar's viscometer determines the dynamic and kinematic viscosity and density according to ASTM D7042. The results ... -
AMVn measures relative, dynamic or kinematic viscosity with as little as 150 µL of transparent and opaque liquids ...
Software
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The Anton Paar RheoPlus for AMVn is a modular software and offers solutions from quality control up to research tasks. ...
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The windows software Visiolab for AMVn allows the combination of different Anton Paar instruments, e.g. AMVn with ... -
Visiolab for SVM Windows software controls SVM 3000 with and without sample changer, collects and processes measuring ...
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Biodiesel viscosity measurement is established in the standards ASTM D6751 and DIN EN 14214. The viscosity is an essential parameter for the quality
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Viscometry is a classical method for characterizing polymers in solution. According to ISO 1628, viscosity measurement can also be used to
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Viscosity measurement is becoming increasingly important in breweries because it delivers useful additional information. Using the results, the
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Viscosity of Ionic Liquids, the So-Called 'Green Solvents' - Support for research and development of future liquids
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Viscometry of polymer solutions - Rubber (Polyisoprene, Polybutadiene,…)
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Viscometry for determining the molar mass of chitosan - Precise viscosity measurement of a natural polymer
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Viscosity of Automotive brake fluids - Measuring viscosity for the safe performance of hydraulic systems in vehicles
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Viscometry of transformer and insulation oil - An easy and flexible solution for ‘cool’ and ‘outstanding’ stuff
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Viscometry of heavy fuel oil and residual fuel oil - Heating the world
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Viscometry of bunker oil, marine fuel - Driving world's economy
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Viscometry in the Field of In-Service Oil Determination - Test in-service lube oils by determining their viscosity and VI
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Crude oil viscosity for the petroleum industry - Characterize crude oils by determining their viscosity and API Degrees
Basics of Viscometry
Every single substance on Earth can be placed on a scale from fluid to solid. Viscometry is concerned with the determination of a fluid’s viscosity, that is its thickness or – more scientifically - its internal resistance to flowing.
External forces such as gravity affect the fluid and make it flow. Most substances change their viscosity depending on the external force. If a fluid’s viscosity remains constant independent of the external force it is called an ideal or Newtonian fluid.
One dominating influence on viscosity is temperature: the warmer it gets, the less viscous a substance becomes. Consequently, correct viscosity measurement requires precise temperature measurement and temperature control.
Basics of Automated Micro Viscometer AMVn
The AMVn is a microviscometer based on the rolling ball principle.
- A ball rolls through a closed, liquid-filled capillary, which is inclined at a defined angle.
- Two inductive sensors determine the ball's rolling time between two defined marks.
- Both the liquid's dynamic and kinematic viscosity can be calculated from the rolling time
Basics of Stabinger Viscometer SVM 3000
The SVM 3000 uses the Stabinger measuring principle, named after its inventor Dr. Hans Stabinger.
- A lightweight magnetic rotor floats in a liquid filled tube, which rotates at constant speed. The rotor is centered by the centrifugal forces.
- The sample fluid’s viscous forces drive the rotor. This leads to an equilibrium rotor speed, which is recorded as an unambiguous measure of the fluid’s viscosity.
- The floating rotor and a contactless measuring sensor eliminate all undesirable influence of external friction.
- A built-in U-tube oscillator for additional density measurement permits the simultaneous determination of density, kinematic and dynamic viscosity.
History of Viscometry
(taken from Thomas G. Mezger “The Rheology Handbook, 2nd Edition, p. 252ff)
The word “viscosity“ is derived from the Latin word “viscum” for
“mistletoe”. In the old days, mistletoe berries were used to make a
sticky kind of glue for catching birds.
75 BC: Titus Lucretius Carus, poet and philosopher, writes a didactic
poem on the flow and gliding behaviour of fluids like water, milk, wine,
olive oil and honey.
1590: Galileo Galilei introduces the systematic use of practical
scientific experiments, e.g. on liquids and solids to characterize a
material’s behavior.
1649: Blaise Pascal reflects about ideal fluids without any flow
resistance.
1687: Isaac S. Newton states proportionality between flow resistance and
flow velocity for fluids.
Since 1800: Use of efflux viscometers (flow cups) for textile printing
inks and oils.
1839: Gotthilf Heinrich Ludwig Hagen designs the first capillary
viscometer.
History Automated Micro Viscometer AMVn
1845: Georges Gabriel Stokes performs scientific
falling ball experiments.
1933: Fritz Höppler designs a “Falling-Ball Viscometer” (commercially
available since 1934 (see also DIN 53015, and later ISO 12058).
1985: For Anton Paar KG, Dr. Jorde and Dr. Ribitsch of the Institute for
Physical Chemistry at the Karl-Franzens-University of Graz develop a
rolling ball viscometer with automatic angle selection, optical
detection and water bath temperature control.
1988: Anton Paar KG introduces the AMV 200, an electronic
microviscometer with inductive sensors, which also permits the
measurement of opaque liquids. The inclination angle can be varied from
15° to 90°.
1999: Anton Paar GmbH presents the AMVn Automatic Microviscometer as the
successor to the AMV 200. Thermoelectric temperature control (Peltier
elements) replaces the water bath system.
History Stabinger Viscometer SVM 3000
2001: Anton Paar GmbH introduces the SVM 3000 Stabinger Viscometer,
invented and developed by Dr. Hans Stabinger and his team at the “Labor
fuer Messtechnik“ in Graz/Austria. The entirely new measuring principle
is protected by the European patent EP 0 926 481 A2. Dr. Stabinger also
developed the oscillating U-tube principle for precise density
measurement in the 1960s.
2004: ASTM D7042-04 Standard test method for Dynamic Viscosity and
Density of Liquids by Stabinger Viscometer (and the Calculation of
Kinematic Viscosity)
From 2005 onwards: ASTM D7042-04 is referenced by other ASTM standards.
- ASTM D6074 – 08 Standard Guide for Characterizing Hydrocarbon Lubricant Base Oils
- ASTM D6823 – 08 Standard Specification for Commercial Boiler Fuels With Used Lubricating Oils
- ASTM D6448 – 09 Standard Specification for Industrial Burner Fuels from Used Lubricating Oils
- ASTM D7152 – 05e1 Standard Practice for Calculating Viscosity of a Blend of Petroleum Products
