Cone and plate viscometer

Introduction

A cone and plate viscometer is an instrument used to measure the viscosity of liquids, in which the liquid is placed between a rotating cone and a stationary flat plate, and the shear stress and the shear rate are determined from the rotation, and it is used for measuring the viscosity and the rheological properties of liquids, such as paints, inks, foods, pharmaceuticals, and other fluids, in research and quality control. The viscometer consists of a cone with a small angle that almost touches a flat plate, a motor that rotates the cone or the plate, a torque sensor, and a temperature controller; the sample is placed in the gap between the cone and the plate, and when the cone rotates, the liquid is sheared at a constant shear rate, since the shear rate is uniform across the gap in the cone and plate geometry, and the torque required to rotate the cone is measured and converted to the shear stress, and the viscosity is calculated as the ratio of the shear stress to the shear rate; the cone and plate geometry requires a small sample volume and provides a rapid measurement, and it allows the measurement of the viscosity as a function of the shear rate, providing the flow curve of the liquid. Cone and plate viscometers are used for measuring the viscosity of paints, coatings, and inks, for measuring the viscosity of foods, such as sauces and dairy products, for measuring the viscosity of pharmaceuticals and cosmetics, for characterizing the rheological properties of polymer solutions and other fluids, for quality control, for research, and for many other applications, and they are available as benchtop instruments with features such as precise temperature control, variable shear rates, and digital displays. With their precise viscosity measurement, cone and plate viscometers are essential for rheological testing.

Cone and Plate Viscometer LCPV-T2010

Cone and Plate Viscometer offers a viscosity range from 20 to 11920 mPa.s to measure fluids with a broad range of viscosity levels. It is equipped with advanced a torque sensor and adjus...

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Standards

ISO 3219:1993-Plastics-Determination of viscosity using a rotational viscometer with defined shear rate

ASTM D2196-20-Standard Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational Viscometer

Complies with the above standards, but is not limited to them.

Features

1. Cone and plate viscometer for precise viscosity measurement of small sample volumes.

2. Rotational cone-and-plate geometry for accurate viscosity and shear rate measurement.

3. Suitable for chemical, pharmaceutical, food, cosmetic, material, industrial and research labs.

4. Includes cone spindle, plate, temperature control, motor, controller, software and manual.

5. Supports precise viscosity measurement for small samples and non-Newtonian fluid characterization.

FAQ

Q1: What testing scenarios is this viscometer mainly applied to?

A: The cone and plate viscometer is used in chemical laboratories, pharmaceutical development, food and beverage, cosmetics, materials science, industrial quality control, coatings, inks and research to measure the viscosity of liquids using a cone-and-plate rotational geometry, requiring only small sample volumes (typically 0.5-2 mL) and providing precise shear rate control for accurate viscosity measurement and non-Newtonian fluid characterization (shear thinning, shear thickening, thixotropy, yield stress). It supports pharmaceutical formulation viscosity testing (suspensions, emulsions, syrups, ointments, gels - viscosity affects product performance, stability and patient acceptance), food and beverage viscosity measurement (sauces, dressings, dairy products, beverages, chocolate, dough - viscosity affects texture, mouthfeel and processing), cosmetic and personal care viscosity testing (creams, lotions, shampoos, toothpaste - viscosity affects product feel and application), coating and ink viscosity measurement (paints, varnishes, printing inks - viscosity affects application properties and drying), chemical product viscosity testing (polymers, resins, solutions, adhesives), material research and development, and general liquid viscosity measurement. The cone-and-plate geometry provides a uniform shear rate across the sample (unlike concentric cylinder geometries where shear rate varies with radius), making it ideal for non-Newtonian fluid characterization and requiring only small sample volumes, which is advantageous for expensive or limited samples.

Q2: What standards does the viscometer comply with?

A: The cone and plate viscometer follows relevant ISO, ASTM and GB/T standards for viscosity measurement, including ISO 3219 (liquid plastics and resins/polymers - determination of viscosity using a rotational viscometer with defined shear rate), ISO 2555 (resins in the liquid state - apparent viscosity using the Brookfield method, related), ASTM D2196 (rheological properties of non-Newtonian materials by rotational viscometer), ASTM D4287 (high-shear viscosity using cone/plate viscometer), and relevant GB/T standards including GB/T 2794 (adhesive viscosity) and GB/T 10247 (viscosity measurement). The hardware complies with IEC 61010 safety standards. Calibration should use certified viscosity reference standards (standard oils with certified viscosity at specified temperatures, traceable to national standards such as NIST, PTB, NIM). Cone geometry (cone angle, radius) should be verified per standard. Temperature control accuracy should be calibrated. Users should verify the specific standard for their material type and application.

Q3: What is the warranty period for the whole viscometer and key components?

A: The whole cone and plate viscometer is covered by a 12-month warranty. The cone spindle, plate, motor, temperature control system, controller, software and housing are covered, while cones (various angles/radii), plates, calibration standards and fuses are consumables or accessories. Damage from improper use, cone damage (scratching, bending), overloading or unauthorized repair is excluded. Extended service contracts may be available for this analytical instrument. Cones are precision components - damage affects measurement accuracy.

Q4: Is this device difficult to operate? Is professional training required?

A: Operation requires trained laboratory personnel familiar with viscosity measurement, rheology, sample preparation and standard methods. We provide operation manuals, training and application support. Proper cone selection (cone angle, radius - based on sample viscosity range and required shear rate), sample preparation (homogeneous, bubble-free, proper temperature), sample loading (small volume, proper placement between cone and plate - avoid bubbles, ensure proper gap), temperature equilibration (allow sample to reach test temperature - viscosity is highly temperature-dependent), measurement parameters (shear rate, shear stress, duration, data collection), result interpretation (Newtonian vs non-Newtonian, shear thinning/thickening, thixotropy, yield stress) and quality control are important for accurate, reliable viscosity measurement.

Q5: What is the typical lead-time for order delivery?

A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.

Q6: Is regular calibration required? What is the recommended calibration cycle?

A: Calibration with certified viscosity reference standards recommended every 6-12 months (or per quality system). Routine verification with a check standard before each use or per batch. Cone geometry verification (cone angle, radius, tip condition) periodically. Temperature calibration (plate temperature) every 6-12 months. Motor and torque sensor calibration per schedule. Full viscometer performance verification annually with certified standards across the measurement range. Cone condition checked (scratches, bending, wear - damaged cone gives inaccurate results). Software updates per manufacturer.

Q7: Are supporting consumables universal?

A: Cones (various cone angles: 0.5, 1, 2, 4 degrees; various radii), plates, certified viscosity reference standards (standard oils), sample cups/spatulas, cleaning solutions (isopropanol, distilled water, appropriate solvent for sample), temperature control fluid (if circulating bath) and fuses are available from laboratory suppliers, though cone type should match the viscometer model. Long-term consumable cost depends on usage and calibration frequency.

Q8: Can I customize parameters or supporting accessories?

A: Customization includes viscosity range (mPa.s to Pa.s, depending on cone and torque), shear rate range, cone options (multiple cones for different viscosity ranges), temperature range (ambient to 100/150/200 degrees C, or below ambient with cooling), temperature control type (Peltier, circulating bath), measurement modes (flow curve, viscosity vs shear rate, thixotropy, yield stress, creep, oscillation for rheometer models), automation level, data output, software features (rheology analysis, curve fitting, reports), connectivity and accessories. Additional cones, plates, temperature control units and accessories can be ordered separately. Custom orders extend delivery lead-time significantly, especially for rheometer models with oscillation capability.

Q9: Does the purchase include on-site installation and commissioning service?

A: Standard delivery includes the cone and plate viscometer and accessories with an operation manual. On-site installation, calibration and training are not included for standard orders but can be arranged at additional cost (recommended for precision rheology measurements). Remote guidance is provided.

Q10: What types of samples are compatible with this equipment?

A: The cone and plate viscometer measures viscosity of liquids including pharmaceuticals (suspensions, emulsions, syrups, gels, ointments, creams), foods (sauces, dressings, dairy, chocolate, dough, beverages), cosmetics (creams, lotions, shampoos, toothpaste, makeup), coatings (paints, varnishes, inks, adhesives), chemicals (polymers, resins, solutions, oils, surfactants), and other homogeneous liquids within the sample viscosity, shear rate, temperature and cone specification. Different sample types require specific considerations: very low viscosity liquids (water-like, < 1 mPa.s) may require a low-viscosity cone adapter or different geometry (cone-and-plate is less accurate at very low viscosities due to edge effects and inertial effects); very high viscosity materials (pastes, putties, > 1000 Pa.s) may require a wider gap or different geometry (parallel plate, or use a different viscometer type); non-Newtonian fluids (shear-thinning, shear-thickening, thixotropic) require proper measurement protocol (multiple shear rates, equilibrium time at each shear rate, pre-shear to erase shear history); volatile samples (solvents, alcohol-based products) may evaporate during measurement (use a solvent trap or cover, measure quickly, ensure proper temperature - evaporation causes cooling and sample composition change); samples with suspended particles (suspensions, emulsions, dispersions) may require specific cone gap (particle size should be less than 1/10 of the cone gap to avoid particle jamming and measurement artifacts - if particles are too large, use a wider gap cone or parallel plate geometry); very small sample volumes are an advantage of cone-and-plate (typically 0.5-2 mL, depending on cone size - useful for expensive or limited samples). Users should follow the specific test method (ISO 3219, ASTM D2196, ASTM D4287, GB/T 2794, GB/T 10247) for sample handling and measurement, select appropriate cone for the viscosity range and shear rate (cone angle determines shear rate at given rotational speed: shear rate = angular velocity / tan(cone angle) - smaller cone angle gives higher shear rate at same speed; verify the cone is rated for the sample), prepare sample properly (homogeneous, no bubbles - bubbles cause measurement errors; degas if necessary; allow sample to equilibrate to test temperature), load sample properly (place sample on plate, lower cone slowly to avoid trapping air bubbles, ensure sample fills the gap completely with no excess at the edge - excess sample at edge causes edge effects and measurement errors; wipe excess if needed), allow temperature equilibration (viscosity is highly temperature-dependent - typically -2 to -10% per degree C for many liquids; wait until sample temperature stabilizes, typically 2-5 minutes depending on sample volume and temperature difference), set proper measurement parameters (for Newtonian fluids: single shear rate, measure viscosity; for non-Newtonian: flow curve at multiple shear rates (typically 1-1000 s-1), allow equilibrium time at each shear rate (5-30 seconds), pre-shear to erase shear history (especially for thixotropic materials), measure thixotropy with a loop (up and down shear rate ramp) or constant shear rate with time), report results with test conditions specified (temperature, shear rate, cone geometry, sample pre-treatment - viscosity without these parameters is meaningless for non-Newtonian fluids), and for quality control, compare with specification or historical data (establish acceptable viscosity range for the product). The viscometer should be placed on a stable, vibration-isolated table (vibration during measurement causes noise and errors - use a vibration isolation table if the lab has significant vibration from nearby machinery). The cone should be handled carefully (do not touch the cone tip or measuring surface with fingers - oil/dirt affects measurement; do not scratch or bend the cone - a damaged cone gives inaccurate results; clean cone with appropriate solvent after each use, dry carefully, store in protective case). The plate should be clean and flat (scratches or residue affect sample contact and temperature uniformity - clean with solvent, inspect regularly). For temperature control, verify plate temperature with a calibrated thermometer (the controller display is not a substitute for calibrated measurement at the sample location - especially for Peltier systems, there may be temperature gradients). For volatile samples, use a solvent trap (many viscometers offer an optional solvent trap cover to reduce evaporation - this is essential for accurate measurement of volatile samples). For samples that are not homogeneous or contain large particles, consider using a different geometry (parallel plate with wider gap, or concentric cylinder) or a different viscometer type (Brookfield, capillary). The viscometer should be calibrated periodically (every 6-12 months) with certified viscosity reference standards (standard oils with certified viscosity at 20/25/40 degrees C - traceable to national standards; verify calibration across the measurement range, not just one point). For critical quality control (pharmaceutical release, food specification), have the viscometer calibrated by an accredited laboratory (ISO/IEC 17025) with a calibration certificate. Waste (used samples, cleaning solvents, calibration standards) should be disposed of per applicable regulations (some samples may be hazardous, flammable, or toxic - handle per material safety data sheet). The viscometer should be stored with the cone removed and protected (do not store with cone in contact with plate - can cause damage; store cone in protective case). For long-term rheology characterization (oscillation, creep, stress relaxation), consider a rheometer (not just a viscometer) - cone-and-plate viscometers typically measure steady-state viscosity only, while rheometers can measure both steady-state and dynamic (oscillatory) properties. The distinction between viscometer and rheometer should be verified before purchase.