Low Temperature Dynamic Viscosity Tester

Verifying Cold‑Weather Lubricity with the Low Temperature Dynamic Viscosity Tester

Introduction
At low ambient temperatures, lubricants can thicken, impeding pumpability and delaying machinery start‑up. The Low Temperature Dynamic Viscosity Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. quantifies lubricant flow behavior under sub-zero conditions, supporting formulation of winter‑grade oils.

Testing Principle
Following ASTM D2983 (vibrating‑cup) or D5293 (cold‑cranking simulation), the instrument cools samples to specified temperatures (down to –40 °C or below) in a refrigerated bath. A vibrating‑cup or coaxial cylinder viscometer module applies shear; the resulting torque or oscillation decay is measured, yielding dynamic viscosity in mPa·s.

Technical Design Features

• Precision Refrigeration Unit: Peltier or cascade‑compressor system holds target temperature within ±0.2 °C.

• Anti‑Condensation Enclosure: Prevents frost formation on critical sensors.

• Interchangeable Viscometer Modules: Support vibrating‑cup, coaxial cylinder, or falling‑ball geometries.

• Automated Equilibration and Measurement: Software ensures consistent dwell times and data capture.

Industry Applications

• Engine Oils: Formulate SAE 0W, 5W, and 10W grades for reliable cold starts.

• Greases: Assess pumpability of automotive and industrial greases at low temperatures.

• Hydraulic Fluids: Verify flow properties for cold‑climate equipment.

Best Practices

1. Sample Filtration: Remove particulates and water that can affect low‑temperature viscosity.

2. Equilibration Time: Allow at least 30 minutes at test temperature before measuring.

3. Module Maintenance: Keep viscometer components clean and calibrated per manufacturer guidelines.

4. Temperature Verification: Use an independent probe to confirm bath uniformity and sensor accuracy.