CAV® 4.2 Dual-Bath Kinematic Viscometer

For Kinematic Viscosity of Transparent and Opaque Liquids
ASTM D445/D446, ISO 3104/3105, IP 71

CAV® 4.2 is a fully automated, dual-bath, benchtop viscometer with two 14-position sample handlers for unattended D445 processing. Each of the two Ubbelohde-style tubes (one per bath) covers a 100-fold viscosity range between 0.5 mm²/s (cSt) and 10,000 mm²/s (cSt) from 15 °C to 150 °C (with available options).

Common Applications

  • Formulated oil analysis
  • Hydraulic oil analysis
  • Additive analysis
  • Marine fuel testing
  • Base stock analysis
  • Light and heavy fuel testing
  • Waxes/paraffin
  • Crude oil testing
  • Glycols

CAV 4.2 Video

CAV 4.2 Video

D445 precision in a modern, dependable design

  • Temperature range: ambient to 100°C (15°C to 150°C with available bath options)
  • Viscosity range: 0.5mm²/s (cSt) to 10,000mm²/s (cSt)* in 100-fold increments (easily covering the range of 5 separate manual glass viscometers)
  • Dual, independent modular baths enable simultaneous testing at two different temperatures
  • Two fully accessible, 14-position sample handlers ensure reliable, unattended processing of up to 24 determinations per hour
  • Automation provides an alternative to labor-intensive manual testing and reduces operator to operator variability
  • A well tested CANNON viscometer platform offers reliability and dependable support

Compact & self-contained with flexible configuration

  • Simple, out-of-the-box installation
  • 35% smaller footprint conserves lab space
  • Optional, environmentally friendly Peltier cooling requires no external refrigeration
  • An onboard computer enables preprogrammed test parameters to be run without an external PC
  • VISCPRO® PC software enables programming of user-defined test methods and permits one PC to manage and control up to four instruments
  • User-configurable reports may be viewed, printed, saved and exported

Reduced consumable costs

  • ASTM D445/ISO 3105 Ubbelohde-style tubes reduce solvent usage and disposal costs by 50%
  • Automated vial washing and drying enables reuse and reduces vial consumption

Simplified maintenance and test versatility

  • Modular bath for easy maintenance access
  • Operators physically replace tubes in minutes, eliminating the need for related service calls
  • Single-point temperature calibration avoids tube recalibration costs and maximizes flexibility
  • Colored status indicator bath lights provide a simple remote indication of operational status
  • Multiple predefined/user-defined test methods can be run within the same sample tray
  • (Optional) High throughput, selective zone heating preheats individual samples to any temperature from ambient to 100°C
  • Instrument includes standard dual-solvent input

* Some upper viscosity measurements may be limited by test temperature and sample type. Fast run (10-fold range) tubes are also available.


Link to Downloads page for Software and Firmware 

Dimensions (W × D × H) 36.0cm × 66.0cm × 72.0cm (14.3in × 26.0in × 28.5in)
Weight 63.0kg (140.0lb)
Shipping dimensions (W × D × H) 81.3cm × 53.3cm × 99.0cm (32.0in × 21.0in × 39.0in)
Shipping weight (with all items) 96.6kg (213.0lb)
Maximum thoughput 24 tests per hour
Automated sample capacity 28 positions (2 x 14 positions)
Viscosity range 0.5mm²/s(cSt) to 10,000mm²/s(cSt) in 100-fold increments (depending on viscometer tube selection). Fast run tubes are also available.
Timing resolution 0.01s (timing accuracy to ± 0.001s)
Temperature range and accuracy 20°C to 100°C, ± 0.01 °C (temperatures within 5°C of ambient and below require bath cooling)
Up to 150°C, ± 0.03°C (with high temperature bath)
Down to 15°C, ± 0.03°C (with TE cooling)
Minimum sample/solvent volume 8mL sample/15mL solvent per test (as little as 3mL with fast run tubes)
Operating conditions 15°C to 30°C, 10% to 75% relative humidity (non-condensing), Installation Category II; Pollution Degree 2
Electrical specifications 100Vac, 50/60Hz; 115Vac, 50/60Hz; 230Vac, 50/60Hz; 1200watts power consumption
Compliance CE Mark; EMC directive (2004/108/EC); Low voltage directive (2006/95/EC); HI-POT (1900 Vdc, 60 sec.); ROHS
Additional standard features Internal heated waste drain lines, dual solvent input
Data output USB


Link to Downloads page for Software and Firmware 

CAV® 4.2 Dual-Bath Kinematic Viscometer comes with two 14-position sample carousels, two viscometer tubes, one set of oil viscosity standards, a case of glass vials, a high precision digital thermometer with probe, VISCPRO® data storage/management software, a one year warranty and professional installation/training (within the domestic U.S.). Specify desired factory installed options and viscometer tubes when ordering. Computer sold separately. Description  Part #
100Vac, 50/60Hz, 1200watts 9725-B30
115Vac, 50/60Hz, 1200watts 9725-B35
230Vac, 50/60Hz, 1200watts 9725-B40


Factory installed options (see NOTE) must be specified when ordering. Part numbers are listed below for field installable options. Field installation must be performed by factory-trained personnel (unless indicated by an asterisk *). Field installation costs are not included.
Note: A third solvent input, integrated high temperature baths (left or right) and additional temperature calibration (for each temperature beyond the first) are also available at the time of ordering.


Description Part #
Sample preheat assembly for glass vials (left/right) 68.0538/68.0540
Sample preheat assembly for metal sleeves (left/right) 68.0537/68.0539
Sample carousel safely cover* 68.0299
Integrated thermoelectric bath cooling (per bath) 68.0541
External heated waste drain lines* 68.3112
Laser printer* 93.6005
Enhanced vapor reduction (100Vac and 115/230Vac) 68.0484/68.0485


Vial, Polypropylene 24mm x 62 mm (1,000/pk)


CAV 4.2 Carousel (glass vials)


Pedestal Base (CAV 4.2)


CAV 4.2 Safety Cover


Kit, Metal Sleeve Wax Sample


External drain wrap heater


Glass Vials (24 x 62 mm) (box of 144 vials)




Enhanced Vapor Reduction System (100/115 VAC)


Enhanced Vapor Reduction System (230 VAC)


General Purpose Viscosity Standards

Extended CAV 4.2 User Spare Parts Kit


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