DIN Viscometer ViscoTester 550

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Marjory Daniel
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1 IN Viscometer ViscoTester 550

Introduction η Viscosity Viscosity curve η = f (T) Viscometry The measuring technique for the determination of the viscosity of a liquid is called viscometry.

2 Introduction η Viscosity Viscosity curve η = f (T) Viscometry The measuring technique for the determination of the viscosity of a liquid is called viscometry. Viscosity is a characteristic value that depends on environmental conditions like e.g. temperature and pressure. Since it is a variable that can only be determined indirectly, the measuring results are not absolute as they rather depend on the measuring method. ifferent instruments may deliver different results and still measure correctly, i.e. the test substance should also be a factor when choosing a measuring instrument. Viscometers The Höppler falling ball viscometer C is the classical instrument for the measurement of the viscosity at defined environmental conditions. With the exception of this one instrument, ThermoHaake specializes in rotational viscometers like instruments of the ViscoTester 01/02 series or the ViscoTester 6/7. The ViscoTester 550 bridges the gap between classical QC viscosity measurements and research rheometry. It is suitable for extensive investigations for quality control as well as for routine measurements in the Research and evelopment epartment. Rheometers are instruments that can also be used for the determination of elastic properties (e.g. the ThermoHaake RheoStress instruments). These instruments are described in a separate brochure. 2 Flow Behavior If the viscosity of a product does not only change with temperature but also with stress, it is a non-newtonian substance. There are materials that, due to their molecular properties, show a lower viscosity when subjected to stress (corresponds to the shearing in a rotational viscometer). These are pseudoplastic liquids. On the other hand some materials increase their viscosity with stress (dilatant liquids) or even react shear-time dependently. This shear-time dependent flow behavior is known as thixotropy when the viscosity decreases with time at constant shearing and as rheopexy when it increases with time. This process has to be reversible, i.e. the viscosity will reach its original value again within a certain time when the shearing has stopped. Yield Point The yield point of a substance corresponds to the force that is necessary within the observation time to start a steady-state flow of the substance. According to this definition, the yield points can be determined approximately with a simple rotational viscometer. The flow behavior with yield points is commonly described as plasticity. A special case is the Bingham flow behavior. τ τ τ Yield Point Shear Stress Newtonian and non- Newtonian flow behavior Shear Stress Bingham and plastic flow behavior The ThermoHaake Viscometer-ram RheoStress ViscoTester Falling Ball 550 Viscometer C VT 01/02, VT 6/7 TTemperature γ γ Shear Rate Shear Rate

ViscoTester 550 The ViscoTester 550 is a speed-controlled rotational viscometer that is driven by a step motor with up to 100 pre-defined speeds of extreme accuracy.

3 ViscoTester 550 The ViscoTester 550 is a speed-controlled rotational viscometer that is driven by a step motor with up to 100 pre-defined speeds of extreme accuracy. From a table of 100 values, 10 values each can be selected within the range of 0.5 to 800 min -1. The torque is measured via the deflection of a torsion element with a resolution of 1:1000 and digitally displayed. The viscosity is calculated by a microprocessor from the torque, speed and the geometry used. The following measurements can be performed either manually at the push of a button, internally via programmed methods or computer-controlled (special accessory at extra charge): Automatic recording of flow curves Time measurements Temperature programs (with optional circulator) C-method (preset deformation) for the determination of a yield point Technical data of the VT 550 Number of speeds continuous Speeds min 1 / 0.1 steps Temperature range -20 to 100 C Typical measuring time 2 to 3 minutes Number of sensors 2 cups, 2 rotors Reproducibility ± 1% igital display yes Interface RS232 Voltage/frequency 100 to 230 V/50 to 60 Hz Measuring ranges cylinder-viscometers Viscosity (mpas) MV IN SV IN Recommended range Max. range Shear rate (1/s) Shear stress (Pa) Temperature ( C) -20 to to 100 Volume (cm 3 ) Gap/max. particle (mm) 1.64/ /0.3 ViscoTester 550 with T/MV ( T/MV as optional accessory) Measuring ranges plate-cone viscometers Viscosity (mpas) PK5, 1 PK1, 1 Recommended range Max. range Shear rate (1/s) Shear stress (Pa) Temperature ( C) -20 to to 130 Volume (cm 3 ) Cone angle (degrees) 1 1 Max. particle size (mm) >100 >100 3

4 IN/ISO-Viscometer 550 with Cylinder Measuring System Order-No European and US Version Application With this IN/ISO viscometer and the cylinder measuring system, fluids from many different fields of industry can be characterized according to IN53019/ ISO Flow curves deliver a rheological determination of Newtonian and non-newtonian flow behavior. Application properties like sedimentation, spreadability or running properties of higher viscous products are determined by measuring the yield point in the C-mode. Food Industry Sauces, mayonnaise, mustard, ketchup and raw materials like thickening agents, stabilizers, starch or pectin Cosmetic or Pharmaceutical Industry Cremes, lotions, shampoos, tooth pastes and liquid soaps Paint Industry Water-based paints, latex paints, bonding agents, resins Chemical Industry Liquid and paste-like raw materials and intermediate products Features Viscosity measurements according to IN 53019/ISO 3219 etermination of the yield point with C (preset deformation) Substances with small particles (<0.3 mm) can be measured Automatic flow curve recording with programmed procedures Print-out of the measuring results to a RS232 printer Interchangeable rotors for medium and high viscous products 4 Contents of standard package: Viscotester 550 ( V/50-60Hz) Support stand for the base unit Temperature control vessel with connector to circulator (Ø 8 mm) PT100 temperature sensor Measuring system MV IN including: Measuring cup MV IN (steel 18/8) Rotor MV IN (steel 18/8) Measuring system SV IN including: Measuring cup SV IN (steel 18/8) Rotor SV IN (steel 18/8) Wearing parts Seal for measuring cup MV-IN (10 pcs.) order no Cylinder measuring system IN 53019/ISO 3219 These standardized measuring systems are preferably used for the measurement of watery substances like watery latex paints (IN 53019), surfactants (IN 53214) and paints (IN 53921). They each consist of a measuring cup and rotor that are used together with the ThermoHaake temperature control vessel. Characteristic values are standardized in order to achieve comparable measuring results with different instruments. Further advantages are the easy handling and cleaning as well as the low measuring error with temperature programs all due to the geometrical form.

5 IN/ISO-Viscometer 550 with Plate-Cone Measuring System Order No European and US Version Application With the cone-plate viscometer 550 high viscous liquids and pastes from many differing fields of industry can be characterized according to ISO Flow curves deliver a rheological determination of Newtonian and non- Newtonian behavior. Application properties like spreadability or stability are determined by measuring the yield point in the C-mode. Food Industry ough, margarine, fats or butter Cosmetic or Pharmaceutical Industry Cremes, soaps and lipstick Paint and Electronic Industry Bonding agents, resins, ink, paste solder, solder stop paint, resistance pastes Chemical Industry Paste-like raw materials and intermediate products Cone and plate measuring system The cone-plate measuring system is preferably used for the measurement of firm, paste-like materials. It consists of the lower measuring plate MP60 on which the interchangeable measuring cones (PK5, PK1) rotate thus shearing the test sample. In ISO 3219 characteristic values are fixed in order to achieve comparable measuring results even if instruments are used that are not identical. Further advantages are the easy handling and cleaning. Contents of Standard Package Viscotester 550 ( V/50-60Hz) Support stand for base unit and plate-cone measuring system Cone and plate measuring system PK200 with connector for circulator (Ø 8 mm) PT100 temperature sensor included in the measuring plate Measuring system cone-plate: Measuring plate MP60 (Steel 18/8) Cone PK5, 1 Cone PK1, 1 Features Viscosity measurements according to ISO 3219 etermination of the yield point with C (preset deformation) Substances containing small particles (<0.1 mm) can be measured Automatic flow curve recording with programmed procedures Print-out of the measuring results on RS232 printer Interchangeable cones 5

Measurement in Manual Mode Select sensor: S. i 0 Press until the display shows S. Press until the desired sensor is displayed S. i MV IN S. 2 SV IN S. 3i PK1,1 S.

6 Measurement in Manual Mode Select sensor: S. i 0 Press until the display shows S. Press until the desired sensor is displayed S. i MV IN S. 2 SV IN S. 3i PK1,1 S. 36 PK5, Select display: mpas C 1/min 1/s Pa isplay: Viscosity in [mpa.s] Temperature in [ C] Speed in [min -1 ] Shear rate in [s -1 ] Shear stress in [Pa] 8. i0 Preset speed: Measurement: Select speed program 1 (5-500 min -1 ) : Select speed 10 = 500 min -1 1 = 5 min -1 0 mpas Result: Read viscosity η 6

7 Measurement in Automatic Mode P. 0 Select sensor: Select procedure 1 to 9 with P.0 The procedures 1 to 9 are defined with the software OS550 0 P.0 = normal mode P. i P.i Yield point determination τ τ = f(γ) with C mode P.i or P.2 τ 0 0 t P. 5 Recording of flow curve = f(t) P.5 τ τ = f(,t) 0 t 7

8 A Thermo Electron business International Thermo Haake ieselstr Karlsruhe Germany Tel. +49(0) Fax +49(0) Hotline +49(0)18050 HAAKE info@thermohaake.com USA Thermo Haake 5225 Verona Road Madison, WI Tel Fax infousa@thermohaake.com France Thermo Rheo 99 route de Versailles Champlan Tel. +33(0) Fax +33(0) info@thermorheo.com UK Thermo PRISM Emerald Way Stone Business Park, Stone Staffordshire ST15 0SR Tel. +44(0) Fax +44(0) info@thermoprism.com ViscoTester, RotoVisco, RheoStress, RheoWin are registered trademarks of Thermo Haake. The product information in this document was correct at the time of printing, however specifications are subject to alteration without notice due to the Thermo Haake philosophy of continual product innovation and development and any information contained herein should not be construed as a contractual commitment by Thermo Haake. All orders are accepted subject to our current Conditions of Sale, copies of which are available on request. Thermo Haake/ec

Rheometer RHEOTEST RN 4.1 For Quality Control and R&D

Rheometer RHEOTEST RN 4.1 For Quality Control and R&D Applications paints and coatings polymers and lubricants pharmaceutics and cosmetic food and luxury food building material bitumen and bituminous products