Help with Rheometers specifications:
Performance Specifications
Back to Top
|
| ||
| Dynamic Viscosity Range: | Dynamic viscosity is a measurement of a fluid's resistance to flow. Water is lower in viscosity than motor oil or honey. Oil is lower in viscosity than tar or molasses. Depending on the application method, viscosity determines how well a resin fills the cavities or voids in a mold. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
| |||
| Kinematic Viscosity Range: | Kinematic viscosity is the time required for a fixed amount of fluid or oil to flow through a capillary tube under the force of gravity. Units of kinematic viscosity are stoke, centistoke (1/100 of a stoke), and Saybolt Universal Seconds (SUS). Saybolt Universal Seconds or Saybolt Universal Viscosity (SUV) is the time in seconds required for 60 cubic centimeters of a fluid to flow through the orifice of a standard Saybolt universal viscometer at a given temperature under specified conditions, usually per ASTM D 88. Kinematic viscosity is also described as the quotient of the absolute viscosity in centipoises divided by the specific gravity of a fluid where both are measured at the same temperature. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
| |||
| Accuracy: | Accuracy is the degree of uncertainly which the measured value agrees with the ideal value. Accuracy is measured in a percentage of the full scale range of the instrument. | ||
| Search Logic: | All matching products will have a value less than or equal to the specified value. | ||
| |||
| Shear Rate Range: | Shear rate ranges is the rate at which the sample fluid or material is sheared or deformed. Thixotropic fluids and materials have vastly different viscosity or rheological responses based on the shear rate. A person walking quickly over a water-cornstarch mixture is an interesting demonstration of the effect of shear rate. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
| |||
Technology Type
Back to Top
|
|
| ||
| Technology Type: | |||
| Your choices are... | |||
| Capillary | Capillary viscometers measure the flow rate of a fixed volume of fluid through a small orifice at a controlled temperature. The rate of shear can be varied from near zero to 106 s-1 by changing capillary diameter and applied pressure. A specific volume of fluid passes through the orifice and the time it takes for the volume of fluid to pass through the orifice is proportional to the fluid viscosity. However, it also depends on the density of the fluid since the denser the fluid, the faster it will flow through the orifice. The property being measured in this example is then the kinematic viscosity and not the dynamic viscosity. | ||
| Controlled Strain (Shear) Rate | Fluids or materials are tested under controlled strain and shear rate conditions. This testing method is Ideal for generating flow curves and studying the rate dependence of materials. | ||
| Controlled Strain | Fluids or materials are tested under controlled strain conditions. | ||
| Controlled Frequency | Dynamic testing offers the advantage of being able to measure the elastic modulus of a material concurrent with viscosity measurements - a critical consideration when testing thermoplastic melts, as melt elasticity is often as important is viscosity. | ||
| Piston / Ball | In piston or falling ball viscometers, a piston or ball is moved or dropped through the test liquid, which is contained in a precise and temperature controlled tube. Under constant applied force, the time required for the piston or ball to pass a specific length of the tube is proportional to the viscosity. In electromagnetic piston viscometers, the piston is made of a ferromagnetic material, which is driven back and forth through the liquid with constant force applied by surrounding electromagnetic coils. Circuitry in the electromagnetic piston viscometer analyzes the piston's two-way travel time to provide a measure of absolute viscosity. Electromagnetically-driven piston viscometers are well suited to in-line viscosity tracking because the piston motion also provides fresh samples and mechanically scrubs the sampling area. In the less sophisticated falling ball or falling piston viscometers, gravity provides the constant force to move the piston or ball. Switches are used to determine the time of travel and as an indication of viscosity. Falling ball viscometers are typically laboratory bench instruments and are not suited to in-line operation. | ||
| Rotational Viscometry (Spindle) | Rotational viscometry refers to the torque required to rotate a spindle at constant speed, while immersed into the sample fluid. The torque is proportional to the viscous drag on the immersed spindle, and thus to the viscosity of the fluid. | ||
| Stress Rheometer | Fluids or materials are tested under controlled stress conditions. Controlled stress or load testing is typically the basic testing mode. | ||
| Specialty / Other | Other gravity or positive displacement methods, needle or specialized methods. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
| |||
Display & Special Features
Back to Top
|
|
| ||
| Display & Special Features | |||
| Your choices are... | |||
| Computer Interface / Networkable | The instrument can be connected to a network or personal computer for the transfer of data or test control. | ||
| Graphic / Video Display | The data is presented in video form with a cathode ray tube (CRT), liquid crystal display (LCD), or other multi-line form. | ||
| Handheld / Field | Handheld or portable devices are used in field applications to test soil, construction materials, and pavement. | ||
| In-Line / In-Tank (Process / Continuous) | Sensors, instruments or monitors are mounted within or on a process line, piece of equipment, or machine tool in a production environment to allow continuous monitoring and control of specific materials or media properties. | ||
| Laboratory / Benchtop (Batch) | Devices are benchtop, table-based, or floor-mounted gages or instruments where a part is both manually loaded and measured. The tester, instrument, or test equipment is a larger, free-standing or floor-mounted unit. | ||
| Measures Temperature | The instrument also measures temperature. | ||
| SPC / Application Software | Instruments have integral or optional SPC or application software for data analysis capability. | ||
| Temperature Compensated | The instrument is compensated for errors caused by changes in temperature. | ||
| Specialty / Other | Other unlisted display option types. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
| |||
Industry / Application
Back to Top
|
|
| ||
| Your choices are... | |||
| Adhesives | Companies that design, manufacture, market, and distribute equipment for adhesives manufacturing and processing. Also companies that design, manufacture, market, and distribute adhesives. | ||
| Biotechnology | Biotechnology is any technological application that uses biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use | ||
| Chemical Processing | Companies that manufacture and/or distribute chemicals, including basic, intermediate, and specialty chemicals; petrochemicals; plastic resins and materials used in synthetic fibers; agrochemicals; and paints and coatings. | ||
| Cosmetics | The Cosmetics Industry is a category that includes products purchased and utilized by consumers for personal use. Included in this category are skin care products, hair-care products, lotions, perfumes, make-up and other products and stances that are typically applied to the body for cleansing, enhancement or protective purposes. | ||
| Energy / Power Plants | Companies that provide energy products, including crude oil, natural gas, and refined petroleum; utility services, including the generation of electricity, the transmission and distribution of electricity, natural gas, and water; and/or the marketing and trading of energy commodities. | ||
| Food and Beverage | Companies that process, manufacture, distribute, market, and/or sell foodstuffs for human consumption. Companies that produce, market, and bottle alcoholic and nonalcoholic beverages, carbonated drinks, juices, energy/sports drinks, water, coffee, and tea. | ||
| Non-Newtonian Liquid | Non-Newtonian fluids are a mixture of pigments, suspenders, polymers, solvents, etc. Each of these items by itself may or may not have Newtonian characteristics, but when combined they shear in unique, non-linear ways | ||
| Petroleum / Oil & Gas | The petroleum industry includes the global processes of exploration, extraction, refining, transporting (often by oil tankers and pipelines), and marketing petroleum products. | ||
| Pharmaceutical | Companies that research, develop, produce, and sell chemical or biological substances for medical or veterinary use, including prescription, generic and OTC drugs; vitamins and nutritional supplements; drug delivery systems and diagnostic substances; and related products, equipment, and services, including distribution and wholesale. | ||
| Plastics / Polymers | The plastics industry manufactures polymer materials and offers services in plastics important to a range of industries, including: aerospace, building and construction, electronics, packaging, and transportation. | ||
| Specialty / Other | Other unlisted industry type. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
| |||
