High Temperature Foaming Characteristics of Lubricating Oils Tester

Simulating Real‑World Conditions with the High Temperature Foaming Characteristics of Lubricating Oils Tester

Introduction
Under prolonged high‑temperature operation, lubricants can foam differently than at room temperature. The High Temperature Foaming Characteristics of Lubricating Oils Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. quantifies foam tendency and stability at elevated temperatures (up to 150 °C), replicating conditions found in gearboxes, turbines, and compressor bearings.

Testing Principle
Adapting ASTM D892, this tester evaluates foam under two temperature regimes:

1. Moderate High Temperature: 93.5 °C bath for compatibility with gearhead lubricants.

2. Extreme High Temperature: Up to 150 °C for turbine and compressor oils.

Air is sparged at 5 mL/min or 10 mL/min (adjustable) for 5 minutes. Foam volumes are measured immediately and after a 5‑minute collapse period using high‑temperature‑rated graduated cylinders and optical sensors.

Technical Design Features

• Dual‑Stage Heating System: Electric heaters and thermal insulation provide stable bath temperatures up to 150 °C with ±0.5 °C control.

• High‑Temperature Diffusers: Porous metal diffusers rated for 200 °C ensure consistent air bubble generation at elevated temperatures.

• Reinforced Optical Probes: Heat‑resistant lenses and fiber‑optic cables transmit foam‑height data to room‑temperature electronics.

• Safety Interlocks: Over‑temperature shutoff and coolant circulation protect sample integrity and user safety.

Key Applications

• Turbine Oil Testing: Prevent foaming in steam or gas turbines where lubricant temperatures exceed 100 °C.

• High‑Speed Compressor Oils: Ensure antifoam performance in bearings operating at elevated temperatures.

• Gearbox Oil R&D: Validate additive packages for heavy‑duty industrial gearboxes subject to thermal cycling.

Best Practices

1. Thermal Equilibration: Pre‑heat samples to the target test temperature in a separate oven to avoid initial temperature shocks.

2. Diffuser Inspection: Check for sintering or pore blockage monthly; replace diffusers to sustain bubble size consistency.

3. Optical Calibration: Run a high‑temperature foam standard (e.g., certified silicone oil) to verify sensor performance.

4. Safety Protocols: Use heat‑resistant gloves and eye protection when handling cylinders and bath components.