How to install and debug the geosynthetic material anti-seepage instrument? -Huaqiang Electronic Network

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Adjustable capacitor Murata genuine original

Test - lowercase jpg

Kaixin micro test

Test probe P100-M3

Installation and commissioning of geosynthetics impermeability meter?
Installation and use:

1. Pressure setting: press the setting button “Back” after power on. Press the shift key “>” and then press the adjustment keys “+” and “--” to adjust the value. After adjusting, press the setting button “Back”. Deposit. After adjusting the lower limit value, press the set key to exit. The lower limit of 8 hours rises to 0.1MPa

Time clear: Re-do the experiment, keep pressing the "--" button to not release, first display the time value, 10 seconds after the time can start from 0 hours, "!" can not be mistakenly pressed.

2. Time review: press “—” key to change to hour display, the upper limit is minute and the lower limit is second. Return to the pressure display after 30 seconds,

3. Zero adjustment: If there is no pressure after starting, if it does not return to zero, press once to set zero. Do not press the clear button when there is pressure, and then zero after releasing.

4. Open the water injection cover and add pure water. When the water tank is full, start the pressure and open the pressure regulating valve to make the water flow into the high pressure chamber chassis to just overflow.

5. Place the sample on the net in the sump without wrinkles, spill excess water to ensure no air bubbles in the clamp; cover the porous plate and evenly clamp the sample.

Note: For specimens composited from textile materials and membranes, one side of the membrane should be facing the water surface; for composite materials with textile surfaces on both sides and the membrane in the middle, the specimen can be clamped to the side of the water surface. Part of the textile material is carefully peeled off, and a corresponding adhesive such as glass glue may be applied to the corresponding portion to ensure that the portion to be gripped does not leak water.

6. Slowly adjust the inlet valve to increase the water pressure in the clamp to 0.1 MPa. If the approximate range of the hydrostatic pressure resistance of the sample can be estimated, the water pressure can be directly added to the lower limit of the range to start the test. While maintaining the above pressure for at least 1 h, it was observed whether or not water permeated in the pores of the perforated plate. If the sample is not water-permeable, pressurize step by step with a step of 0.1MPa, and each stage shall be kept for at least 1h until water seeps out, indicating that the sample has water seepage holes or cracks have occurred. The hydrostatic pressure resistance of the sample is accurate to 0.1 MPa.

7. If the device specified in GB/T19979.2 is used, it is judged whether water seepage is caused by the seepage flow rate. When the percolation flow rate is very small under a certain hydraulic pressure difference, it can be considered that there is no water seepage. When the seepage flow increases rapidly, it indicates that the sample has water seepage holes or damage has occurred, and the test can be terminated.

Note: When there is water droplet in the hole of the perforated plate, if there is no water seeping after wiping it off, it can be judged that this is caused by the overflow of the edge of the sample, and the test can be continued; if it is wiped off, there is still If the water seeps out, it can be judged that it is caused by water seepage of the sample, and the test can be terminated. If it is only necessary to judge whether the sample reaches a certain hydrostatic pressure resistance value, it can be directly pressurized to this pressure value for at least 1 h. If there is no water seepage, it is judged to meet the requirements. The residual hydrostatic pressure values ​​of the remaining samples were determined according to the procedure. If the three values ​​differ greatly (the lower two values ​​differ by more than 50%), the test specimen should be added.

8. The lowest value of the measured hydrostatic pressure values ​​of the above three samples is taken as the hydrostatic pressure resistance value of the sample; if the measured value exceeds 3, the average value of the lowest two values ​​is as follows: If it is lower and lower than the lower low value by more than 50%, the value should be discarded.

9. The calculation results are calculated according to relevant standards.