LBT-022A Geomembrane High-Voltage Spark Leak Detector
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Description
Product Introduction:
The geomembrane high-voltage spark‑testing leak detector is suitable for leak‑detection and integrity assessment in landfill liners, tailings‑dam seepage monitoring, landscape‑lake leakage inspection, aquaculture‑pond sealing verification, wastewater‑storage‑tank leak detection, and other construction‑related leakage‑prevention applications.
Product Features
This device is a pulsed high‑voltage instrument designed for leak detection. Compared with conventional DC spark testers, it reduces spark‑induced damage to materials, features an enhanced leak‑memory function, and improves operator efficiency. The pulsed spark tester can be used to assess the quality of coatings such as geomembranes, epoxy coal‑tar linings, and rubber linings, regardless of their thickness. When material defects—such as pinholes, blisters, fissures, or cracks—are present, the instrument emits a bright electrical spark and triggers both audible and visual alarms. Powered by a rechargeable battery, it is particularly well suited for field operations. With a robust and reliable design, this instrument finds wide application in the chemical, petroleum, rubber, and enamel industries, serving as a tool for evaluating the quality of metallic anti‑corrosion coatings.
Technical Specifications:
| Parameter Category | Parameter content |
| Thickness measurement | 0.2~15mm |
| Output high voltage | 1.5 kV to 31.5 kV (continuously adjustable in steps), with a three-digit LCD display showing the output high voltage. |
| Leak point counting function | Smart counting, with a maximum memory of 999 entries. |
| Defect indication | Dual audio and visual alarm |
| DC power supply | 12V |
| Power consumption | Approximately 60,000, undervoltage indication function |
| Host volume | 250×210×90mm |
| Host weight | 1Kg |
Detection Principle and Structural Composition
1. Detection Principle: The electrical spark detector applies a pulsed high voltage to the surface of the anti-corrosion coating on various conductive substrates. If the coating is too thin, contains exposed metal, or has pinhole defects allowing gas leakage, the pulsed high voltage will cause air-gap breakdown, resulting in spark discharge. Simultaneously, this generates a pulse signal that triggers the alarm circuit, causing the alarm device to sound, thereby achieving the purpose of coating inspection.
2. Structural Composition: The instrument consists of three main components: the host unit, the high-voltage probe, and the probe electrode.
- Host section: Includes an integrated control circuit, an audible alarm device, and other components. The names of the components on the front and rear panels of the host are shown in the figures below.
- High‑voltage probe assembly: It houses a high‑voltage generator, a high‑voltage output push‑button switch, and lead wires, among other components. The names of the individual parts of the high‑voltage probe are shown in the figure.
(3) Probe section: available in two types—straight probe brush and flat probe brush.
Testing method:
1. The pulse electrical spark method shall be capable of detecting leakage defects on the impermeable geomembrane that are no smaller than 1 mm in size.
2. Steps for pulse spark detection: site preparation, equipment testing and calibration, actual detection, re‑testing, and report compilation.
3. During leak‑detection and damage‑assessment using the pulsed electrical spark method, the upper surface of the geomembrane shall be smooth, dry, exposed, free of debris, and electrically insulated. The geomembrane must be a conductive material specifically designed for this purpose, with the conductive layer installed facing downward.
4. For calibration of the pulsed electrical spark detection system prior to testing, either actual breach holes with a diameter of approximately 1 mm or artificially simulated breach holes may be used. To simulate artificial leakage breaches, a metallic conductor no larger than 1 mm in diameter should be inserted through the impermeable geomembrane, with one end connected to the underlying foundation layer beneath the geomembrane and the other end exposed on the surface of the geomembrane.
5. Conduct point-by-point detection according to the planned survey network layout, while monitoring electrical sparks and the acoustic signals emitted by the detector, to identify the location of leaks or damage.
The procedure for the spark test is as follows:
Place a copper conductor along the upper edge of the geomembrane overlap. Cover the conductor with an extrusion weld, and during welding, use a screwdriver or other tool to keep the conductor centered in the weld seam.
At the end of the extruded weld seam, one end of the wire shall extend approximately 50–70 mm beyond the seam to serve as the electrode for the electrical spark. The wire need not be coiled, but it must remain continuous along the entire length of the weld.
The test voltage of the testing apparatus is 20,000 volts.
During testing, connect the grounding terminal of the test device to the exposed end of the wire in the weld seam, and slowly (at approximately 5 meters per minute) pass the copper brush along the entire length of the weld. The copper brush must remain in contact with the weld. If a defect is present, an audible signal will sound; move the copper brush about 2 cm away from the weld, and the electrical sparks between the defect and the brush will indicate the precise location of the flaw.
Any areas where bubbles appear during testing must be marked, reworked and repaired, and then tested again.
After passing the test, trim off the exposed copper wire, then grind the area and solder it using extrusion welding.
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