Emphasis is put on problems related to measurement artefacts stemming. Fann produces a range of true couette coaxial cylinder rotational viscometers. Three different models type l, r and h, as well as various accessories, allow it to cover a wide range of viscosity measurement. A viscometer also called viscosimeter is an instrument used to measure the viscosity of a fluid. Thank you for acquiring the vpad rotational viscometer model from fungilab. Rotational viscometer rotational viscometer gathers data on a materials viscosity behavior under different conditions. Rheometers have made giant leaps in terms of usability, sensitivity, and versatility.
The viscosity is determined through the measurement of the torque on a vertical shaft that rotates a spindle. Astm d4402 d4402m15, standard test method for viscosity determination of asphalt at elevated temperatures using a rotational viscometer, astm international, west conshohocken, pa, 2015, back to top. The model b viscometers success, with over 60,0 00 units sold, is proof positive of the outstanding qualities which have made this model so popular simple construction, ease of use, sure measurement. Searle george frederick charles searle, 1864 1954, a british physicist and teacher, who designed a rotational viscometer with rotating concentric inner cylinder in 1912. Fungilabs rotational viscometers are available in three series, each with their own merits and functions. Viscosity rotating viscometer method for nonnewtonian liquids it is indispensable to specify the shear stress. Viscosity of nonnewtonian fluid using brookfield rotational viscometer duration. The article will focus on typical problems that are encountered in rheological practice when measuring polymer melts. The vpad is a rotational viscometer, based on the torque measurement of a rotating spindle in the sample at a specified velocity.
Lv viscometers are provided with a set of four spindles and a narrow guard leg. Viscosity of newtonian and nonnewtonian liquids rotary. Rheological measurements viscometers are used to measure rheological properties viscometer is defined as instruments used to measure viscosity they differ on the basis of geometry and shear rates there are three main types capillary viscometer rotational viscometer moving body viscometer. Rotational methods can be used to measure the viscosity of fluids, or to. Dont let traditional viscometers get in the way of perfect print jobs.
The dv2t extra is a special package that includes several optional features to maximize the utility of the dv2t. A stainless steel sensor element is submerged into a fluid and made to move back and forth. Fann produces a range of true couette coaxial cylinder rotational. Part of the instrument is rotated, and this leads to the sample being sheared. The force of friction which one part of the liquid offers to another part of the liquid is called viscosity. Brookfield asset management invested in longterm value. Because the specific rotational speed and the spindle used as well as the temperature. Fann model 35 viscometers are couette rotational viscometers. Ostwald viscometer, rubber tube with screw pinch cock, relative density r. Model 35 viscometer instruction manual fann instrument co. Rotational viscometers thermo fisher scientific new zealand. These viscometers use the principle of rotational viscometry, i. The torque is proportional to the viscous drag on the spindle. Various industrial and academic rheology laboratories collaborated to merge.
Determine the gradient of the rotational velocity as a function of the torsional shearing stress for two newtonian liquids glycerine, liquid paraffin. The ems viscometer requires only very small sample quantities 0. They measure viscosity by sensing the torque required to rotate a spindle at constant speed while immersed in fluid. Suitable for small volume sample measurement of a wide range of viscosities including gel. Viscometer and rheometer thermo scientific haake imlab. Original fungilab viscometer for essential viscosity measurements, digital and easy to use. By modifying the classic couettetype rotational viscometer, it is possible to combine the accuracy of kinematic viscosity determination with a wide measuring range. The rotational viscometer is not an inflammable, nonhazardous instrument and therefore should not be used in areas where there is an explosion risk. Stepless speed rotavisc is a viscometer, which offers stepless speed adjustment. Laboratory viscometers typically rotational viscometers. Rotational viscometers work by getting the measurements of the torque on a vertical stand that moves the spindle in a rotational direction. The torque on the cylinders, or on the cone and plate, is related to the shear stress in the sample, and the shear rate can be calculated. Rotate the level adjustment bolt to level the instrument. Dont let traditional viscometers get in the way of.
Rotational viscometers measure the viscosity of the sample by turning a spindle in a cup. General chapter viscosity reference corrections in monographs type of posting. Fasten the fixing bolt and remove the rubber band from the needle control rod. Directly export results from instrument data storage as pdf or csv. Target customers oil industry, petrol industry, inks and solvents, paint, food, detergents, cosmetic, pharma and chemical industries low budget and entry level customers. Why choose a cone spindle for viscosity measurement.
Whereas viscoqc 100 is designed for quick singlepoint viscosity determination, viscoqc 300 delivers multipoint viscosity results right at your fingertips. Most commercial rotational viscometers incorporate this principle, which is named after g. Performance parameters determined include viscosity repeatability precision, detection limit, quantitation limit, linearity, and bias. What are typical sources of error in rotational rheometry. The test fluid is contained in the annular space or shear gap between the cylinders. The viscometer product line can measure viscosity from a near waterlike viscosity to a very high viscosity range for epoxy, sealants, and paste. Rotational rheometers require calibration with evidence of timedependent e. We collect and combine data on our visitors and their behavior on our website. Chp 0633 rotational viscosity measurement method, method iii. Rotational viscometers falling ball viscometers vibrational viscometers ult i i tultrasonic viscometers. Rotary viscometer viscosity tester fluid meter lcd display ndj9s item available here. Pdf the paper addresses techniques for checking the performance of. Combined with a wide range of accessories, these viscometers are designed with the end user in mind.
Rotational viscometers use the concept of torque to measure the effort required to turn a disk or bob in a fluid. Ball bearing suspension not included in lv versions, ezlock spindle connection, model q lab stand, and rheocalct software. Using a rotational viscometer, the viscosity is calculated from the measured torque and rotational speed as well as the dimensions of the measuring geometry. Rotational viscometers use the idea that the torque required to turn an object in a. Rotational viscometers are used to measure viscosity. Brookfield viscometers, how to take a viscosity reading. D bottle known as pyknometer also, stand, beaker, unknown liquid, distilled water. Rotational viscometers measures the dynamic viscosity of. Apparent viscosity of unfilled asphalt binder is evaluated by a rotational viscometer which measures the torque generated by a calibrated spindle rotating at a.
Rotation of the outer cylinder at known velocities is accomplished through precision gearing. Rotary viscometer viscosity tester fluid meter lcd display. Determine the flow curve for a nonnewtonian liquid chocolate. On the basis of product, the rheometers and viscometers market is segmented into rheometers dynamic rotational rheometers, torque rotational rheometers, capillary rheometers, capillary rheometers, oscillatory rheometers, highthroughput rheometers, and other rheometers and viscometers process viscometers, capillary viscometers, rotational. Direct indicating viscometers combine accuracy with simplicity of design. The viscosity, or resistance to flow, of a material can be determined by a rotational viscometer. This manual covers the dv2t viscometer and the dv2t extra viscometer. Brookfield dial viscometer operating instructions manual no. Ika rotavisc lovi complete viscosity measuring range. Rotational rheometer methods 5653 which the measurements should be made. A rotational viscometer can consist of a coneandplate arrangement figure 9, or concentric cylinders with the sample material in the annular space between them figure 10. Undernarrowgap conditions conditions satisfied in absolute viscometers, there is a proportional. The easy to use digital stormer viscometer is also part of the rotational viscometer family. Investigate the temperature dependence of the viscosity of castor oil and glycerine.
Rotational viscometers can be used for the accurate measurement of viscosity for both newtonian and nonnewtonian fluids. Touch viscometer for immediate startup right out of the box. The model 35 viscometer is the best known and most commonly used fann viscometer. Rotational viscometer an overview sciencedirect topics. Fungilabs viscolead adv series rotational viscometers combine advance viscosity measurement with a userfriendly interface. Rotating bobs are more common, rotating cups reduce the likelihood of vortex formation, and cone and plate viscometers create a constant shear rate at any speed. Wells23 introduced a cone plate rotational viscometer for measuring viscosity of biologic.
In this viscometer, the test fluid is contained in the annular space shear gap between an outer cylinder and the bob inner cylinder. It is the responsibility of the user to establish health and safety. General chapter viscosity reference corrections in. Rotational viscometer alpha series allows fast and accurate viscosity readings. The viscometer can also be used to approximate other flow characteristics by relating viscosity and flow for a known composition. Although more expensive than a standard viscometer with a cylinder or disc spindle, the time savings when running viscosity tests more than justifies the selection of cone and plate. Get the latest rotational viscometers from the technology leader and bring outstanding, fully traceable results to your daily quality control routine. Rotational viscometers have become a standard in virtually all industries.
Pdf guidelines for checking performance and verifying accuracy. Two different setups are used when measuring viscosity using a rotational viscometer. To measure viscosity under a high shear rate cone and plate viscometers are available. This test method provides procedures for validating viscosity measurements by rotational viscometers of newtonian fluids. The rotation of the spindle is usually proportional to how viscous the sample is. The principle of operation of this viscometer is the same as all other rotational viscometers. Unscrew the bolt on the protection cap at the bottom of the instrument head and take off the protection cap.
1129 717 381 864 1103 351 228 1214 159 635 121 1266 154 1220 1314 999 467 1157 1545 282 776 493 48 999 788 973 68 431 827 1257