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
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.
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.
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:
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
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
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
| Parameter | Specification |
|---|
| Glass burettes | 25 mL + 25 mL, ±1% |
| Blender speed | 1300 r/min |
| Blender power | 6 W |
| Ultrasonic cleaner frequency | 40 ± 2 kHz |
| Ultrasonic cleaner power | 50 W |
| Ultrasonic cleaner speed | 1300 r/min |
| Cleaning tank size | 150 × 140 × 95 mm |
| Instrument size | 177 × 167 × 200 mm |
| Timer range | 1–99 min |
| Power source | AC 220V / 50 Hz |
Main Features
Microcomputer-controlled ultrasonic dispersion and stirring – precise and automated.
Simultaneous titration with dual burettes – increases efficiency and accuracy.
Room-temperature sample processing – avoids heat-induced errors.
Automatic control of mixing and processing time – easy to operate and reproducible.
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.
