DVNext Cone/Plate Rheometer

DVNext Cone/Plate Rheometer:

The DVNext Wells-Brookfield Cone/Plate Rheometer is a sophisticated instrument that can routinely determine the absolute viscosity of fluids in small sample volumes. The cone and plate geometry provides the precision that is necessary for the development of rheological data.

Main Benefits:

• Can determine the absolute viscosity of small samples of 0.5 – 2.0 mL
• Precise shear rates to determine a materials flow curve behaviour
• Rapid temperature control
• Electronic gap adjustment that simplifies setup and increased throughput
• Has touchscreen display
• Auto-zero function that guarantees precision torque measurement
• Auto-range function that can define full-scale-range for all spindle/speed combinations
• Torque measurement accuracy: 1% of full-scale range
• Repeatability: 0.2% of full-scale range

How It Operates:

The DVNext Cone/Plate Rheometer is a precise torque meter aimed at discrete rotational speeds. The torque measuring system senses the resistance to rotation that is caused by the presence of sample fluid between the cone and a stationary flat plate. This resistance to the rotation produces a torque that is proportional to the shear stress of the fluid in the rheometer. This reading is converted into centipoise units from pre-calculated range charts. Viscosity can also be calculated from the known geometric constants of the cone, the rate of which the rotation is occurring and the stress related torque.

The cone and plate obtain the correct position 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 sample fluid, and remounted without disturbing calibration. The cup used 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.

There are various cone spindles available for use with the DVNext Cone/Plate Rheometer. One cone spindle is provided with the instrument and calibrated for use with the sample cup, additional cone spindles can be purchased and calibrated for use with the same sample cup.

Versatile Application:

The DVNext Cone/Plate Rheometer has a wide variety of shear rates and viscosity ranges, this can be further extended using interchangeable cone spindles. The different models are selected to meet the specific range of viscosities and shear rates that are required. Shear rates can be offered as high as 1875 sec-1.

The small sample volume allows rheological evaluations to be made on materials where sample availability is limited such as biological fluids and thick film coatings. All parts that may become wet are made of stainless steel for corrosion resistance and easy cleaning. There are optional purge fitting, luer fitting and an embedded temperature probe available.

Gap Settings:

The DVNext Cone/Plate Rheometer has an advanced Electronic Gap Setting feature which 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 which reduces the time required associated with manual detection methods.