CAV 4.1 Single-Bath Kinematic Viscometer

For Kinematic Viscosity of Transparent and Opaque Liquids ASTM D445/D446, ISO 3104/3105, IP 71. CAV® 4.1 is a fully automated, single-bath, benchtop viscometer with two 14-position sample handlers for unattended viscosity results processing. 

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The CANNON CAV 4.1 is a fully automated, single bath, benchtop viscometer with two 14-position sample handlers for unattended D445 processing. Each of the two Ubbelohde-style tubes covers a 100-fold viscosity range at values between 0.5 mm2/s (cSt) and 10,000 mm2/s (cSt) from 40 °C to 150 °C (down to 20 °C with optional integral bath cooler).

The CAV 4.1 replaces CANNON’s trusted, obsolete CAV-2100 viscometer.

Conforms to ASTM D445/446, ISO3104/3105 and IP71.  Common applications include 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/polyols.

Additional information


Bitumen, Condition Monitoring, Crude Oil, Fuels, Lubricating Oil, Residual Fuel, Viscosity




ASTM D445, ASTM D446, IP 71, ISO 3104, ISO 3105


Asphalt/bitumen, Automotive, Aviation, Chemical, crude, Environmental, Food/Flavor/Fragrances, Marine, Mining, Paints & Coatings, Petroleum, Pharma, Plastics

Features & Benefits

D445 precision in a modern, dependable design

  • Replacement for CANNON’s old trusted CAV-2100
  • Standard temperature range: 40 °C to 150 °C (down to 20 °C with TE bath cooler option)
  • Viscosity range: 0.5 mm²/s (cSt) to 10,000 mm²/s (cSt)* in 100-fold increments (easily covering the range of 5 separate manual glass viscometers)
  • 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 than CAV-2000 series conserves lab space
  • 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% compared to larger Atlantic-style tubes
  • Automated vial washing and drying enables reuse and reduces vial consumption

Simplified maintenance and test versatility

  • Modular chassis design for easy maintenance access
  • Operators can 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

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