Auto Lubricating Oil HTHS Dynamic Viscosity Tester Manufacturer

Simulating Engine Conditions with the Auto Lubricating Oil HTHS Dynamic Viscosity Tester

Introduction
High‑Temperature High‑Shear (HTHS) viscosity is a critical parameter for engine oils, reflecting their ability to maintain film thickness under hot and high‑load conditions. The Auto Lubricating Oil HTHS Dynamic Viscosity Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. automates HTHS measurements in compliance with ASTM D4683 and JASO T606.

Testing Principle
Oil samples (3 mL) are heated to 150 °C in a Peltier‑controlled chamber. A spinning‑cup or piston‑in‑capillary assembly applies shear rates of 1 × 10³ s⁻¹ to 1 × 10⁶ s⁻¹. The resulting dynamic viscosity is determined from torque or pressure signals, providing mPa·s values that correlate closely with engine‑start wear protection.

Technical Design Features

• Peltier Temperature Control: Rapid heating and tight stability (±0.1 °C) enable quick test cycles.

• High‑Precision Rotor/Piston: Maintains target shear rates within ±2 % across the full range.

• Automated Sample Handling: Robotic injector and capillary interface minimize operator time and error.

• Anti‑Vapor Jacket: Prevents oil degradation by excluding oxygen during high‑temperature exposure.

• Integrated Software Workflows: Pre‑programmed methods for ASTM and JASO protocols, with automated reporting and LIMS export.

Key Applications

• Engine Oil Formulation: Balance low‑temperature pumpability with high‑temperature film strength.

• Quality Control: Verify each batch meets target HTHS viscosity before release.

• OEM Validation: Provide data for engine wear models and warranty guidelines.

Best Practices

1. Sample Filtration: Use 2 µm filters to remove particulate contaminants that can affect pressure readings.

2. Viscometer Calibration: Validate torque and shear accuracy using standard HTHS oils at multiple shear points.

3. Oil Conditioning: Pre‑heat samples to 100 °C for 15 minutes to remove dissolved gases before HTHS testing.

4. Regular Maintenance: Replace seals and O‑rings in the rotor assembly every 500 hours to maintain leak‑free operation.