Product Overview

The QR-SEL-A Methylene Blue Absorption Tester is designed to determine the methylene blue absorption and effective bentonite content in bentonite used for molding sand. By using ultrasonic dispersion and mechanical stirring, the instrument ensures accurate, fast, and reproducible results, helping to prevent surface defects on castings caused by low-quality bentonite.

This instrument features microcomputer-controlled ultrasonic dispersion and titration, allowing simultaneous control of two burettes for precise methylene blue titration. The sample is dispersed at room temperature, ensuring full contact between bentonite and methylene blue for reliable measurement.

Working Principle

1. Bentonite Adsorption: Bentonite has strong adsorption capacity for methylene blue, which varies depending on type, origin, and dispersion degree. Complete dispersion is required to measure maximum absorption.

2. Ultrasonic Dispersion: High-frequency ultrasonic waves create cavitation in the liquid. The rapid collapse of cavitation bubbles generates shock waves that efficiently disperse bentonite particles and remove contaminants.

3. Mechanical Titration: Simultaneous mechanical stirring ensures full contact between methylene blue and bentonite. The titration continues until free methylene blue appears in the suspension, indicating saturation and allowing calculation of blue absorption.

Instrument Structure

The QR-SEL-A consists of three main modules:

1. Sample Dispersion Device

   • Ultrasonic cleaner (MJ-50) with high-efficiency aluminum zirconate titanate ceramic transducer

   • Timer-controlled sample processing

   • Low-noise, energy-efficient design for desktop operation

2. Automatic Titration Device

   • Two automatic burettes (25 mL each, ±1%)

   • Anti-corrosion solenoid valves controlled by microcomputer

   • Supports simultaneous titration and precise reading of methylene blue solution

3. Mechanical Blender

   • AC motor (6 W) drives turbine blade via coupling

   • Microcomputer-controlled mixing time

   • Ensures thorough stirring for complete adsorption reaction

Main Technical Specifications

Main Features

1. Microcomputer-controlled ultrasonic dispersion and stirring – precise and automated.

2. Simultaneous titration with dual burettes – increases efficiency and accuracy.

3. Room-temperature sample processing – avoids heat-induced errors.

4. Automatic control of mixing and processing time – easy to operate and reproducible.

5. Prevents casting defects – ensures accurate evaluation of bentonite quality.

Main Applications

The QR-SEL-A is widely used in:

• Foundry and casting industry – evaluating bentonite quality in molding sand and old sand.

• Scientific research & universities – studying clay properties and adsorption behavior.

• Quality inspection laboratories – ensuring consistent bentonite performance to prevent casting surface defects.

✅ Why Choose QR-SEL-A?

• Fully automated microcomputer control ensures accurate and reproducible results.

• Ultrasonic dispersion provides complete separation of bentonite particles for precise measurement.

• Dual burettes allow simultaneous titration, improving efficiency.

• Easy to operate, safe, and suitable for laboratory, research, and industrial applications.