LBTZ-51 Waterproof Membrane Lap Joint Impermeability Tester
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Description
Product Introduction
The waterproof membrane lap‑joint impermeability tester complies with the national standards GB 55030‑2022 and GB 45320‑2025, which set mandatory requirements for waterproofing in building and municipal engineering. Additionally, the national standard “Safety and General Technical Specifications for Building Waterproof Membranes” has introduced a new requirement for the “impermeability of lap joints” of waterproof membranes. This requirement covers all lap‑joining methods, including heat‑fusion, welding, self‑adhesive, adhesive bonding, and tape‑sealing. Upon formal implementation of these standards, “lap‑joint impermeability” will become a mandatory criterion in the quality acceptance of waterproof membranes. In accordance with the test methods specified in T/CWA 302‑2023/10, construction practices for building waterproofing projects constitute an essential component of construction technology, ensuring that buildings and structures are protected from water ingress and that interior spaces remain unaffected. Through the proper application of waterproofing materials, the occurrence of water infiltration and leakage can be prevented, thereby safeguarding the functional performance of buildings and extending their service life.
Technical Specifications:
| Parameter Category | Parameter content |
| Power supply | 220V 50Hz |
| Pressure range | 0–0.4 MPa |
| Pressure sensor accuracy | Level 1 |
| Number of permeable discs | Three stations |
| Inner diameter of the permeable disc | 250mm |
| Specimen dimensions | 300*300mm |
Instructions for Use
When using cement-based adhesives for lap‑joint specimens, the lap joints at the sealing ring should be filled with materials such as butyl tape or two‑component polyurethane waterproof coating to prevent the adhesive from being crushed under load during testing, which could lead to water penetration. After lapping, the specimen dimensions are approximately 300 mm × 300 mm. A seal is applied around the rubber gasket by means of tape, sealant, or by adhering a membrane of appropriate thickness and size, thereby eliminating any height difference that may arise on the water‑facing side after the membrane is lapped. On the non‑water‑facing side, a suitably sized membrane can be placed directly to bridge the height difference. For self‑adhesive membranes, the release liner on the water‑facing surface of the specimen must be removed, and the portion of the self‑adhesive layer in contact with the test apparatus should be covered with a paper towel. A schematic diagram of the lap joint is shown in the figure.
Procedure:
(1) Before use, first adjust the pressure according to the test conditions specified for the specimen. To do so, set the pressure to 0.2 MPa and the hysteresis to 0.1 MPa.
(2) During operation, loosen and remove the retaining rings from the three permeable plates, tightly close the drain valve, slowly fill the water inlet box with clean water from the side, connect the power supply and turn it on, then press the test button to activate the pressure pump for water injection. Once water begins to emerge from the central inlet hole of the permeable plate, press the stop button to halt the filling process. Place the specimen to be tested on the rubber gasket of the permeable plate, then position the joint‑waterproof cover plate over the specimen, securely clamp the specimen, set the desired pressure and duration, and finally press the test button to start the test.
Instructions for use:
1. Before use, set the pressure according to the test requirements of the specimen.
The method for adjustment is:
(1) Click to set the pressure value; an input keypad will appear, allowing you to enter the test pressure.
2. When using the electric waterproof membrane lap‑joint water‑tightness tester, close the drain valve tightly, slowly fill the side‑mounted water reservoir with clean water, and open each permeation‑plate valve one by one. Press the test button to activate the pressure pump and inject water until water begins to emerge from the central inlet of the permeation plate; then press the stop button to halt the injection. Proceed from right to left in sequence: 0 (0 represents the drain valve, which may only be opened after the test is completed), 1, 2, and 3—continue filling until water overflows from the central inlet of the permeation plate and completely fills the plate.
3. Place the test specimen on the annular rubber ring of the permeable plate, then position the specimen press plate on top of the specimen and secure it firmly.
4. Set the time value according to the test requirements. Click on the time value:
5. Click the test; the pressure pump begins to pressurize the container, and the pressure‑increase indicator light illuminates.
6. When the pressure reaches the upper limit, pressurization automatically stops; at this point, the pressurization indicator light turns off. After completing the test for the prescribed duration, open the drain valve to release the water and relieve the pressure, then loosen the pressure ring and remove the specimen. The test is now complete.
7. Set parameters:
Press the Settings button to enter the settings interface:
8. System Calibration:
According to the calibration procedure, enter the password 8888 to access the calibration interface. With no pressure applied, press “Zero” to reset the zero point; then apply a known force to the sensor and press “Pressure Calibration.” Enter the applied force value, and the displayed pressure will match the applied force—calibration is complete. The device is pre‑calibrated at the factory and ready for immediate use.
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