CANNON HTHS-II High-Temperature High-Shear Dynamic Viscosity Tester

Overview

The CANNON HTHS-II High-Temperature High-Shear Dynamic Viscosity Tester is an engineered capillary viscometer designed to determine the dynamic viscosity of engine oils and other lubricants under rigorously controlled high-temperature and high-shear-rate conditions. It operates on the principle of pressure-driven laminar flow through a precision-bore fused-silica capillary tube, where shear rate is precisely defined by fluid velocity gradient across the capillary radius and volumetric flow rate. The instrument maintains a stabilized bath temperature of 150 °C ± 0.1 °C and achieves a nominal shear rate of 1.4 × 10⁶ s⁻¹—conditions mandated by ASTM D5481 for evaluating high-temperature, high-shear (HTHS) viscosity, a critical parameter in modern engine oil specification (e.g., SAE J300). Unlike rotational rheometers, this capillary-based system delivers direct, primary measurement traceable to fundamental fluid mechanical principles, ensuring metrological integrity for formulation validation, quality control, and regulatory compliance.

Key Features

• Engineered for precision: Dual-stage temperature control with PID-regulated oil bath and real-time thermocouple feedback ensures thermal stability within ±0.1 °C at 150 °C.
• High-throughput operation: Automated sample introduction and sequential testing support 15–20 determinations per hour without operator intervention between runs.
• Robust safety architecture: Integrated inlet valve interlock prevents pressurization unless sample loading is confirmed; overtemperature cut-off circuitry de-energizes heating elements if bath exceeds setpoint by >2 °C.
• Maintenance-minimized design: No rotating parts, no bearings or seals subject to wear—reducing downtime and long-term cost of ownership.
• Configurable test parameters: User-defined temperature setpoints (within operational range) and programmable pressure profiles enable method development beyond standard HTHS conditions.
• Traceable calibration: Capillary geometry certified per ISO/IEC 17025-accredited procedures; viscosity results are directly calculable from measured pressure drop, flow time, and capillary dimensions.

Sample Compatibility & Compliance

The HTHS-II accommodates conventional and synthetic engine oils, gear oils, hydraulic fluids, and other Newtonian or mildly non-Newtonian petroleum-based liquids with kinematic viscosities ranging from 2 to 200 mm²/s at 100 °C. It is fully compliant with ASTM D5481 (Standard Test Method for Measuring Viscosity of Engine Oils at High Temperature and High Shear Rate), SAE J300 (Engine Oil Viscosity Classification), and SH/T 0703-2001 (Chinese national standard for HTHS viscosity determination). All hardware and software components meet requirements for GLP and GMP environments, including audit-trail-enabled data logging and electronic signature support in accordance with FDA 21 CFR Part 11 when used with validated software configurations.

Software & Data Management

The included Windows-based HTHS Viscosity Calculation Software provides full instrument control, real-time monitoring of pressure, temperature, and flow timing, and automated viscosity computation using the ASTM D5481 algorithm. Raw data—including differential pressure, efflux time, ambient barometric pressure, and bath temperature—is stored in encrypted binary format with timestamped metadata. Export options include CSV, PDF, and XML formats compatible with LIMS integration. The software supports user-level access controls, version-controlled method templates, and configurable report generation with embedded instrument ID, calibration certificate references, and operator identification. Audit trails record all parameter changes, data modifications, and user logins—ensuring full data integrity and regulatory readiness.

Applications

• Formulation screening of low-viscosity, high-efficiency engine oils (e.g., SAE 0W-16, 0W-20) where HTHS viscosity directly correlates with piston ring friction and fuel economy performance.
• Quality assurance in lubricant manufacturing, verifying batch-to-batch consistency against internal specifications and OEM requirements.
• Regulatory submission testing for API licensing, ACEA approvals, and OEM-specific qualification programs (e.g., GM dexos®, Ford WSS-M2C945-A).
• Research into shear-thinning behavior of polymer-thickened oils under extreme shear, supporting structure–property relationship studies.
• Validation of viscosity index improver (VII) performance and thermal–mechanical degradation resistance.

FAQ

What standards does the HTHS-II comply with?
ASTM D5481, SAE J300, and SH/T 0703-2001 — all enforced under identical test conditions: 150 °C and 1.4 × 10⁶ s⁻¹.
Can the instrument operate at temperatures other than 150 °C?
Yes — while optimized for 150 °C per ASTM D5481, the bath temperature can be adjusted between 100 °C and 170 °C for method development or specialized research applications.
Is the capillary tube replaceable, and how often should it be calibrated?
The fused-silica capillary is a consumable component; replacement is recommended after 500–1000 tests or upon visible contamination or flow deviation exceeding ±0.5%. Calibration verification is performed quarterly using NIST-traceable reference oils.
Does the system support 21 CFR Part 11 compliance out-of-the-box?
The base software includes audit trail, electronic signatures, and role-based access — however, full Part 11 compliance requires site-specific validation documentation and IT infrastructure alignment per organizational SOPs.
What maintenance is required beyond capillary replacement?
Annual inspection of pressure transducers, thermocouple calibration, and oil bath fluid analysis (oxidation, particulate load); no routine lubrication or alignment is necessary due to solid-state design.