Cannon Ubbelohde Dilution Viscometer with NIST-Traceable Calibration Certificate

Overview

The Cannon Ubbelohde Dilution Viscometer (Model 9721-R series) is a precision capillary viscometer engineered for the accurate determination of kinematic viscosity in transparent Newtonian liquids. Based on the classical Ubbelohde design—a suspended-level, dilution-type capillary viscometer—it operates on the principle of Poiseuille flow under gravity-driven laminar conditions. The instrument measures the time required for a fixed volume of liquid to flow through a calibrated capillary under controlled temperature, enabling calculation of kinematic viscosity (ν, in mm²/s) using the relation ν = C × t, where C is the viscometer constant and t is the efflux time. Its suspended-level configuration eliminates dependence on sample volume beyond the minimum fill requirement, ensuring high reproducibility across sequential dilutions—making it especially suitable for polymer characterization (e.g., intrinsic viscosity, limiting viscosity number) and solvent quality assessment in QC laboratories.

Key Features

• True Ubbelohde geometry with independent reservoir arm, enabling direct dilution without transfer or contamination between measurements
• NIST-traceable calibration certificate included (for 9721-R variants), documenting individual efflux time validation against reference standards per ISO/IEC 17025 requirements
• Unity Factor Series construction: viscometer constants certified within ±0.2% of nominal values, verified at 25 °C using certified reference oils
• Standardized capillary dimensions and bulb volumes conforming to ASTM D446 specifications for Type 1A Ubbelohde viscometers
• Optimized for use in thermostatically controlled baths with minimum immersion depth of 241 mm (9.5 in) to ensure full thermal equilibration of the capillary and timing bulb
• Available in 13 calibrated constant increments (from 0.001 to 100 mm²/s²), supporting kinematic viscosity measurement from 0.3 to 100,000 mm²/s — covering low-viscosity solvents to highly concentrated polymer solutions
• Manufactured in the USA using borosilicate glass (ISO 3585-compliant), with precision fire-polished capillaries and laser-etched scale marks for unambiguous meniscus reading

Sample Compatibility & Compliance

This viscometer is validated exclusively for transparent, Newtonian fluids that exhibit laminar, steady-state flow under test conditions. It is not suitable for opaque, non-Newtonian, or particulate-laden samples. Applications include hydrocarbon solvents, lubricating oils, synthetic esters, and polymer solutions in good solvents (e.g., polystyrene in toluene, PET in phenol/o-chlorophenol). All 9721-R models comply with the dimensional, procedural, and reporting requirements of ASTM D445 (Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids), ASTM D446 (Specification for Glass Capillary Kinematic Viscometers), ISO 3104 (Petroleum products — Determination of kinematic viscosity), and ISO 3105 (Glass capillary kinematic viscometers — Specifications). Data generated supports GLP-compliant reporting when used with documented calibration, SOP-controlled bath stability (±0.02 °C), and validated stopwatch or automated timing systems.

Software & Data Management

While the Cannon Ubbelohde viscometer is an analog, benchtop instrument requiring manual timing and temperature monitoring, its output integrates seamlessly into digital laboratory workflows. The supplied calibration certificate includes a unique serial number and traceable uncertainty budget, enabling direct linkage to LIMS or ELN entries. When paired with Cannon’s optional ViscoLink™ timing interface or third-party PC-based timers compliant with ISO/IEC 17025 timing validation protocols, efflux times can be logged with timestamp, operator ID, and bath temperature metadata. Raw data (t₁, t₂, t₃ per run) and calculated kinematic viscosities are fully auditable. For polymer characterization, the instrument supports standard dilution series protocols aligned with ISO 1628-1 (Plastics — Determination of viscosity number), including Huggins and Kraemer plot generation in validated spreadsheet templates or statistical software packages (e.g., JMP, Minitab) satisfying FDA 21 CFR Part 11 requirements when configured with electronic signatures and audit trails.

Applications

• Determination of intrinsic viscosity and molecular weight of synthetic polymers (e.g., PVC, PS, PET, PA6) per ISO 1628 and ASTM D1243
• Quality control of jet fuels, diesel, and base oils per ASTM D445 and IP 71
• Solvent purity verification in pharmaceutical excipient manufacturing (ICH Q5E, Q7)
• Viscosity grading of silicone fluids and heat-transfer liquids
• Research-grade characterization of ionic liquids and bio-based lubricants
• Validation of viscosity standards and secondary reference materials in metrology labs

FAQ

What is the minimum required sample volume?
11 mL is the minimum volume needed to properly fill the viscometer’s reservoir and timing bulb while maintaining correct meniscus positioning.
Is the viscometer compatible with automated timing systems?
Yes — the 9721-R series features standardized optical detection zones; it is compatible with Cannon ViscoLink™, Anton Paar AMVn, and other ISO 17025-validated phototimer systems.
Does the calibration certificate satisfy ISO/IEC 17025 requirements?
Yes — each certificate lists measurement uncertainty, reference standards (NIST SRM traceability), environmental conditions, and technician accreditation per ILAC-MRA signatory laboratory practice.
Can this viscometer be used for non-Newtonian fluids?
No — the Ubbelohde design assumes constant shear rate during efflux; non-Newtonian behavior invalidates the kinematic viscosity calculation and violates ASTM D445 scope.
Are mounting holders included?
No — the 9726-M82 universal holder must be ordered separately to ensure vertical alignment and vibration isolation in constant-temperature baths.