LQHV-670 Automatic Surface & Interfacial Tension Tester

Circle-method analyzer for petroleum products and industrial fluids with touchscreen simplicity

Technical parameters

Compliant with: GB6541-86 | ASTM D971 | ISO 6295

Core Features

• 🔄 Dual Measurement Modes - Liquid-gas surface tension & liquid-liquid interfacial tension

• 👆 One-Touch Operation - Guided workflow via color touchscreen

• 📊 Precision Results - 0.1 mN/m resolution with ±1% repeatability

• ⚡ Rapid Testing -

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Testing Workflow

1. Sample Preparation

• Surface tension: Pure liquid in clean glass vessel

• Interfacial tension: Oil/water phases at 25±1°C

2. Instrument Setup

• Select test mode via touchscreen

• Lower ring into liquid interface

3. Auto Measurement

• Precise force detection during ring detachment

• Automatic meniscus correction

4. Result Output

• On-screen display with pass/fail indication

• Optional printout with timestamp

Industry Applications

Transformer Oil

• New oil quality control (>40 mN/m per IEC 60814)

• Oxidation monitoring (declining tension indicates degradation)

Lubricant Development

• Additive package effectiveness testing

• Emulsion stability assessment

Quality Standards Reference

Maintenance Protocol

• 🧼 Daily - Clean platinum ring with acetone/ethanol

• ⚖️ Weekly - Verify calibration with distilled water (72.8 mN/m at 20°C)

• 🔧 Monthly - Check ring geometry (circularity ±0.5%)