Geotextile equivalent aperture tester
Category：Other
Introduction
Product Introduction and Application Scope
The Geotextile Equivalent Aperture Tester is used to determine the equivalent pore diameter of geotextiles and related products through the wet sieving method. During testing, the geotextile sample serves as the screen without applying tension. Graded particle materials are flushed through the sample under controlled vibration and water flow, and the effective pore size is defined by the specific particle size that passes through the specimen.
This method is widely applied in geotechnical engineering, civil engineering construction, quality inspection laboratories, filtration material research, and hydraulic engineering.
Compliance Standards
GB/T 17634-2019 — Test Method for Determining the Equivalent Opening Size of Geotextiles
ISO/FDIS 12956:1998 — Geotextiles: Determination of the Characteristic Opening Size
Instrument Features
The instrument offers stable, accurate, and user-friendly performance for evaluating the pore size of various geotextile materials.
It adopts a split-type design to prevent vibration damage to the control system, uses mechanical vibration for smooth operation, and includes a fully transparent protective device for safe observation. The sample is placed on a metal grid to avoid deformation, while amplitude and timing can be freely adjusted for flexible test configurations.
Technical Parameters
| Parameter | Specification |
|---|---|
| Screen inner diameter | 190 mm |
| Vibration frequency | 50 Hz |
| Vertical amplitude | 1.5 mm |
| Nozzle pressure | 300 KPa |
| Water flow rate | 500 mL/min |
| Mesh aperture | 10 ± 1 mm |
| Timing range | 0–99 h (adjustable) |
| Power supply | AC 220V, 50 Hz |
| Overall dimensions | 650 × 550 × 1100 mm |
| Weight | 35 kg |
Advantages
The tester provides stable performance, easy operation and maintenance, and a clear observation area. Its adjustable amplitude and long timing range make it suitable for various test demands.
Product Types
Standard Equivalent Aperture Tester — for routine geotextile testing
High-Precision Equivalent Aperture Tester — for research and certification labs
Customized Aperture Tester — optional screens, fixtures, and water systems
Usage Precautions
Ensure stable placement and water pressure before testing. Clean the protective cover and nozzle regularly. Check particle material grading before each test. Avoid operating without water and verify all connections before starting the vibration system.
FAQ
1. What materials can be tested?
The tester supports woven geotextiles, non-woven geotextiles, composite geotextiles, and other filtration fabrics.
2. How often should maintenance be performed?
Routine cleaning of the protective cover, nozzle, and mesh area is sufficient. Periodic checks ensure long-term stable operation.
3. How is the equivalent pore size determined?
It corresponds to the particle size of the graded material that passes through the geotextile under controlled vibration and water flushing conditions.
4. Can vibration amplitude be adjusted?
Yes. The amplitude is adjustable via a control knob, allowing flexible configuration depending on the material and test requirements.
5. Is this instrument suitable for both laboratory and field use?
It is primarily designed for laboratory and quality inspection use. Field testing is possible with reliable water and power supply.
