CAV 4.1 Single-Bath Benchtop Kinematic Viscometer

Featured Product from CANNON Instrument Company

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CAV® 4.1
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).

Conforms to ASTM D445/446. 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

D445 precision in a modern, dependable design
  • Standard temperature range: 40°C to 150°C (down to 20°C with TE bath cooler option)
  • 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)
  • 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


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CANNON Instrument Company
CANNON Instrument Company has earned international acclaim for the quality of its viscosity-related products and services since its founding in 1938 by scientist, inventor, and educator Dr. Michael R. Cannon. The company's longstanding emphasis on production of premier-quality test equipment has kept CANNON at the cutting-edge of research and development.


  • 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


Automated vial washing and drying enables reuse, and reduces consumable costs. Simple, out-of-the-box installation with 35% smaller footprint than CAV-2000 series conserves precious bench space. VISCPRO Windows® 10 software application permits one controlling computer for up to four instruments, and enables programming of of user-defined test methods. Automation increases precision. Run multiple predefined/user-defined test methods within the same sample tray. Easily removable dual 14-position sample trays allows high throughput of 28 samples per hour.



  • Automated Viscometers & Rheometers
  • Viscosity & Flash Point Standards
  • Constant Temperature Baths
  • Manual Glass Viscometers
  • Physical Property Testers
  • Service & Support
  • Densitometers
  • Digital Thermometers