Brookfield - Laboratory Viscometers

The DVNext Rheometer is Brookfield’s latest model that incorporates new advanced features that our customers have been asking for with the repeatability and reliability you expect from us. It is an easy-to-use, stand-alone instrument for measuring viscosity and yield stress. It's available in a Standard version and a 21 CFR Part 11 Compliant version.

Key features
Standard version

• Digital leveling
• Ethernet connectivity
• Start-up wizard
• Gel-Timer functionality
• Optional magnetic coupling attachment (replaces EZ-lock)
• Optional bar code scanner

Compliant version

• Hand-held scanner for bar code detection
• Accessory detection with bar code detection
• Magnetic coupling attachment (replaces EZ-Lock)
• Compliance to 21CFR Part 11 in stand-alone and GAMP compliant
• LIMS connectivity
• Printing to non-editable PDF

The DVNext Wells-Brookfield Cone/Plate Rheometer gives researchers a sophisticated instrument for routinely determining absolute viscosity of fluids in small sample volumes. Its cone and plate geometry provides the precision necessary for development of complete rheological data.

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. One cone spindle is provided with the instrument and is calibrated for use with the sample cup. Additional cone spindles may be purchased and will be calibrated for use with the same sample cup.

Key features

• 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
• 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

The New DV2T Viscometer features a 5-inch color display to guide users through test creation and data gathering for fast and easy viscosity measurements. The DV2T also offers powerful new programming capabilities and results analysis including data averaging and QC limits with alarms. User instructions with multi-step test protocols can be created using the new Program Generator Software and uploaded to the DV2T through a USB Flash Drive (both included with instrument). Test Data can be recorded directly on a local printer or sent to a PC.  Additional automated control and data collection can be achieved with optional RheocalcT software.

Key features

• 5-inch full color, touch screen display supports multiple languages
• Displayed info includes: viscosity (cP/mP·s), temperature (°C/°F), shear rate/stress, % torque, spindle/speed, step program status
• Enhanced Security provides enhanced security with customizable user levels & password access to comply with regulatory requirements such as 21 CFR Part 11.
• Built-In options include timed tests, data averaging, programmable QC limits/alarms, customizable speed/spindle lists, on screen data comparison
• Auto range shows maximum viscosity measured with any spindle/speed combination
• USB PC interface provides optional computer control and automatic data gathering capability Download custom test programs with included PG Flash software
• Front-facing bubble level for convenient viewing
• Built-in temperature probe
• Accuracy of ±1.0% of range with displayed test data
• Repeatability of ±0.2%

The DVE combines economy and ease of operation with traditional Brookfield excellence to provide reliable viscosity readings. Easy to use interface allows operators to change test parameters easily and test like a pro no time! The digital display ensures easy and accurate readout of test results for simultaneous measurement of viscosity and torque. Quality of manufacture guarantees reliable performance and long life.

Key features

• Low cost and easy to use
• Direct display in:  cP or maps, % Torque, Spindle, and Speed
• Torque measurement accuracy: 1% of full scale range
• Repeatability: 0.2% of full scale range
• Compatible with all Brookfield accessories
• NIST traceable viscosity standards available
• 18 speeds for greater range capability (0.3 to 100 rpm)

The original Brookfield Dial Reading Viscometer has been the lab standard used around the world since 1934. Current units have been been improved with a multi-speed electronic drive and ergonomically designed speed control knob so selection of any one of the 10 pre-set speeds (8 speeds on LVT models) is quick and easy. The direct-drive design results in extremely quiet operation and greater versatility while the universal power supply facilitates the use of worldwide power sources.

Key features

• Continuous torque sensing capability
• Torque measurement accuracy: 1% of full scale range
• Repeatability: 0.2% of full scale range
• Easy speed adjustment and on/off control
• Compatible with all Brookfield accessories
• NIST traceable viscosity standards available
• Electronic drive means quiet, reliable operation
• Universal power supply worldwide compatibility
• 2-Year limited warranty
• Traditional Brookfield quality
• Explosion-proof model is available

Brookfield's CAP-2000+ offers expanded temperature and viscosity ranges with variable speed capability. The CAP2000+ also offers lower shear rates, making it suitable for many applications where small sample volume and good temperature control are necessary. And the rugged, easy-to-use design make it perfect in environments where other instruments won't last.

Key features

• Expanded Ranges
• Viscosity0.2 - 15,000 Poise
• Shear Rate10 - 13,000 sec-1
• Temperature5-75°C or 50-235°C
• Speed of Rotation5-1000 RPM
• Meets Industry Standards:  ASTM D4287, ISO 2884 and BS 3900
• Small sample size, <1 mL, simplifies testing
• Integrated temperature control
• Optional CAPCALC32 software for complete control and data analysis
• Open system for quick and easy cleaning

Brookfield offers a completely digital calculating Krebs Unit Instrument with all the reliability you'd expect in Brookfield instrumentation...now with relative centipoise display.

Why the KU-3? This instrument is used widely for making viscosity measurements on paints/coatings in accordance with ASTM D562.

Key features

• Continuous sensing and display in Krebs units, grams, and centipoise.
• Magnetic spindle coupling.
• Allows rapid sample measurement to determine required consistency.
• LED Digital Display of: Krebs Units (increased resolution in 0.1 KU increments), Grams (in 1 gm increments) and Centipoise (cP).
• Expanded measurement range (40 to 141 KU; 32 to 1099 g; 27 to 5274 cP).
• Accuracy to ±1% of full scale range.
• Reproducibility to ±0.5% of full scale range.
• Easy to use; no weights; simplifies an established test procedure.
• Compatible with industry specification (ASTM D562).
• Base accommodates standard pint, ½ pint, and quart cans.
• The optional paste spindle is suitable for use with high consistency materials such as roller mill pastes.
• NIST traceable viscosity standards available.