DVNext Cone/Plate Rheometer

FEATURES AND BENEFITS
Determine absolute viscosity of small samples (0.5–2.0 mL)
Precise shear rates for determining a material’s flow curve behavior
Rapid temperature control due to small sample size
Magnetic coupling attachment for simplified spindle attachment and removal
Electronic gap adjustment for simplified setup and increased throughput
Touch Screen Display available on DVNext Rheometers
Auto-zero function to ensure precision torque measurement
Auto-range function to define full-scale-range (FSR) for all spindle/speed combinations
Torque measurement accuracy: 1% of full-scale range
Repeatability: 0.2% of full-scale range

PRINCIPLE OF OPERATION

The DVNext Wells-Brookfield Cone/Plate Rheometer is a precise torque meter which is driven at discrete rotational speeds. The torque measuring system, which consists of a calibrated beryllium-copper spring connecting the drive mechanism to a rotating cone, senses the resistance to rotation caused by the presence of sample fluid between the cone and a stationary flat plate.

The resistance to the rotation of the cone produces a torque that is proportional to the shear stress in the fluid. This reading is easily converted to absolute centipoise units (mPa·s) from pre-calculated range charts. Alternatively, viscosity can be calculated from the known geometric constants of the cone, the rate of rotation, and the stress related torque.

The correct relative position of cone and plate is obtained by following a simple mechanical procedure without the need for external gauges or supplementary instrumentation.

The stationary plate forms the bottom of a sample cup which can be removed, filled with 0.5 ml to 2.0 ml of sample fluid (depending on cone in use), and remounted without disturbing the calibration. The sample cup is jacketed and has tube fittings for connection to a constant temperature circulating bath.

The system is accurate to within ±1.0% of full-scale range. Reproducibility is to within ±0.2%. Working temperature range is from 0°C to 100°C.

Various cone spindles are available for use with the DVNext Wells-Brookfield Cone/Plate Rheometer. Cone spindles may be purchased and will be calibrated for use with the same sample cup.

VERSATILITY OF APPLICATION

The DVNext Wells-Brookfield Cone/Plate Rheometer provides a wide variety of shear rates and viscosity ranges, which can be further extended by using interchangeable cone spindles. Different models can be selected to meet the specific range of viscosities and shear rates required.

Shear rates as high as 1875 sec-1 (DVNextCP) can be achieved.

The small sample volume required permits rheological evaluations to be made on materials where sample availability is limited, such as biological fluids and thick film coatings that contain precious metals.

All wetted parts are stainless steel for corrosion resistance and ease of cleaning. Optional purge fitting, luer fitting, and embedded temperature probe available.

UPDATED GAP SETTINGS

The DVNext Wells-Brookfield Cone/Plate Rheometer is supplied with an advanced Electronic Gap Setting feature. This technology allows faster set-up time and minimizes the possibility of gap adjustment errors. A simple turn of the micrometer adjustment ring and the gap is set, reducing the time associated with manual detection methods.

The new electronic gap setting system is now a standard feature on the DVNext Wells-Brookfield Cone/Plate Rheometer. This instrument provides precise shear profiles necessary to determine viscosity and develop rheological data.

LEARN ABOUT VISCOSITY
Need help? Our Education section may be just the thing to clarify unfamiliar terms and help start you on your way to a better understanding of viscosity. Learn about viscosity and rheological relationships, Newtonian and non-Newtonian fluids, and how a Brookfield instrument can help your production process and much more.

HELP ME CHOOSE
Having difficulties determining what instrument is best for you? Try our Help Me Choose section for guidance on the model selection process, spindle construction considerations, and other useful information to help you make an informed decision on the best instrument for your application.

LEARN MORE ABOUT GEL TIMER FUNCTIONALITY
The DVNext Rheometer with Gel Timer Functionality measures gel time using unique magnetic coupling that attaches the glass rod to instrument. When gel time is reached, display shows both gel time and equivalent viscosity value. The glass rod is quickly and easily detached from instrument. Integrated temperature probe provides peak exotherm data if needed. The DVNext can be ordered with glass measurement rod, compression-fit glass rod adapter, lab stand with adjustable stop for quickly positioning glass rod at proper immersion depth in test sample, and temperature probe. Test method can be run either manually or using program stored in instrument memory.

ANNUAL CALIBRATION SERVICE (RECOMMENDED)
We recommend that this instrument be returned to Brookfield or an authorized dealer on an annual basis for our Calibration & Repair Service. Having this annual maintenance done will ensure the instrument’s long life and optimal performance.

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What’s Included

B=1 Billion M=1 million cP=Centipoise mPa·s=Millipascal·seconds mL=Milliliter N=RPM
e.g. Spindle CPA-40Z 7.50×10(rpm)=75.0 sec^-1
*Dependant upon cone selected.