Geotextile permeability tester

Geotextile permeability testerUsed to determine the permeability of various types of geotextiles, its performance meets the requirements of the instrument in GB/T15789-2005 "Testing Method for Permeability of Geotextiles" standard.

Measure the water flow rate vertically passing through a single layer of geotextile under specified conditions.

Main technical parameters

1. High head pressure difference: 250mmH2O (2450Pa)

2. Inner diameter of gripper: ф 50 ± 0.5mm

3. Sample thickness: 20mm

4. Time counter: 0~99.99

5. Temperature gauge range: 0~50

6. Measuring cylinder: 1000mL (10mL)

7. Power supply: 220V

8. Instrument appearance: 400X500X850mm

9. Weight: 25kg

4. Structure

Geotextile permeability testerThe instrument consists of a machine base, container, gripper, control pipeline, control circuit, and other parts. (See Figure - Outline Drawing)

1. There is a control panel installed in front of machine base 12, which is equipped with the [Work] button 8, time counter 9, power switch 10, and the time counter can be set for time. There are 4 adjustable feet 13 installed under the machine base, which can be adjusted to keep the instrument level. The machine base is equipped with components such as solenoid valves and pipelines.

2. The gripper 21 is placed inside the inner container 6 through the positioning support pin 19. The inner and outer containers are connected as a whole, each with a water outlet connected to the pipeline. The upper clamp is connected to the organic glass water level measuring cylinder 4 as a whole, and the lower clamp is a circular hole pressure plate, which is tightened by a tightening nut 20

Plate, clamp the sample in the middle of the clamp. The gripper is placed on the positioning support pin 19, and the water level measuring cylinder 4 has a scale facing the panel direction for easy observation.

3. The inlet 18 is connected to a stable water source, and the flow control switch 5 controls the conduction and flow rate of the water flow. The time counter controls the action conversion of the solenoid valve to determine whether the overflow outlet 17 or the inlet 11 flows out. After pressing the [Work] key 8, the time counter 9 starts counting. When the time counter does not reach the set value, the overflow water is discharged from the water intake 11. At this time, a container is used to collect all the water flowing out of the test port, and the collected water volume is measured using a measuring cylinder; When the time counter reaches the set value, the electromagnet will activate, and the overflowing water will be discharged through the drainage port 17. After the experiment is completed, turn on the water outlet switch 18 and drain the water inside the instrument.

4. Control circuit

Refer to Figure 2- Circuit Diagram

5、 Working conditions

1. The permeability tester should be placed on a flat and stable workbench, with a height suitable for easy operation.

2. The water supply pressure should be stable, and the water pressure fluctuation should not be too large.

3. Environmental temperature: 10-25 ℃