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Deflectometer

Kingmach Deflectometer include the JMDL-62XXADT inductive frequency-modulated hydrostatic level sensor for projects that need a hydrostatic reference network rather than isolated manual checks. The instrument is arranged with connecting tubes, so each measuring location works against a shared liquid level and a stable reference point. Listed ranges are 50 mm, 100 mm, and 200 mm, with 0.01 mm resolution, 0.5%FS accuracy, RS485 output, DC 9V to 24V supply, power consumption below 0.5W, and an operating temperature from -30 degrees Celsius to +80 degrees Celsius. It is applied in dam deformation observation, bridge deflection, slope stability, building settlement, and high-speed rail foundation monitoring. A good project layout starts with the reference benchmark, tube slope, exhaust position, cabinet height, cable route, and channel address. During commissioning, the crew should remove trapped air, confirm fluid continuity, record the initial level, and compare every channel under the same temperature condition. The data cabinet can then collect each channel by address and preserve a clear relation between tube branch, instrument serial number, and drawing location. This makes later data easier to judge because a curve change can be traced back to a named measuring point, a known hydraulic path, and a documented baseline.

Application of  Deflectometer

Application of Deflectometer

Pile foundations, dykes, and embankments use Deflectometer to verify vertical response during loading, filling, or long-term service. Kingmach JMDL-47XXAT is described for pile foundation settlement, dyke compression deformation, embankment heave, roadbed settlement, and base uplift in deep foundation pits. Its assembly includes a settlement plate, electrical displacement sensor, measuring rod with metal flexible conduit, anchor head, extension rod, and bottom anchor head. Published range options are 100 mm, 200 mm, 300 mm, and 400 mm, with gauge lengths from 760 mm to 2210 mm. Because the sensor is embedded, the installation record is almost as important as the reading itself. Crews should document depth, plate position, rod connection, cable exit, protection method, and nearby fill material before the location is covered. During loading, the curve can be checked against fill height, pile test stage, water condition, and surface survey marks. The side-exit cable arrangement helps reduce interference during pavement compaction, which is useful when monitoring must continue as construction equipment passes over the area.

The future of Deflectometer

The future of Deflectometer

The future of Deflectometer will also depend on better installation kits. Many settlement errors begin with field details: a tube is kinked, a plate is disturbed during compaction, a ring depth is recorded poorly, a cable exits at the wrong place, or a reference point is not protected. Future products can reduce these problems with clearer connectors, pre-labeled cables, stronger side-exit protection, better probe markings, and commissioning checklists. Kingmach JMDL-47XXAT already uses side-exit cable routing to avoid pavement compaction interference, and hydrostatic systems rely on clean tube installation. Better installation accessories will make the first baseline more trustworthy. In settlement monitoring, a clean start is often more useful than a later attempt to correct a poor record. The practical goal is to keep settlement data understandable after the original installation crew has left, so owners can compare old and new readings without reconstructing the field history from memory. The same record should remain readable for designers, contractors, owners, and maintenance teams, because settlement monitoring often continues long after the first construction report is finished.

Care & Maintenance of Deflectometer

Care & Maintenance of Deflectometer

Waterproofing and cabinet care matter for Deflectometer because many points work in wet foundations, dams, tunnels, slopes, and outdoor subgrades. Kingmach JMQJ-62XXADT lists IP68 protection, but connectors, cable glands, tubes, and cabinets still need inspection after heavy rain, flooding, dewatering, or washdown. Check for moisture inside junction boxes, loose terminals, damaged jackets, blocked cabinet drainage, and strain on cable entries. If a remote channel drops after a storm, inspect power supply and communication wiring before replacing the instrument. Keep spare seals, glands, connectors, labels, and drying materials available for field crews. Waterproof maintenance should be logged with date, location, weather, observed fault, repair action, and next reading. That record helps distinguish a real settlement change from a wet connector or cabinet fault.

Kingmach Deflectometer

Layered ground behavior is another reason to use Deflectometer. Kingmach JMCJ-1003/1005 magnetic ring settlement water level gauge measures underground layer settlement and groundwater level in foundations, subgrades, foundation pits, embankments, and other underground structures. Magnetic rings are installed in boreholes, and the probe emits audible and visual alerts when it senses a ring. Water level is detected through conductivity when the probe contacts water. The listed accuracy is plus or minus 1 mm, with 30 m, 50 m, and 100 m depth options. This method gives engineers a way to separate shallow settlement from deeper layer movement while also seeing water level variation. It is especially useful when soil behavior and groundwater are tied together. If the curve changes suddenly, field teams should check reference stability, cable or tube condition, recent work, and weather before treating the value as structural movement. If the curve changes suddenly, field teams should check reference stability, cable or tube condition, recent work, and weather before treating the value as structural movement.

FAQ

  • Q: What are Deflectometer used for?
    A: They measure vertical deformation such as foundation settlement, subgrade settlement, embankment heave, tunnel bottom uplift, dam settlement, bridge deflection, and building settlement.

    Q: Which Kingmach models are related to this group?
    A: Common models include JMDL-47XXAT, JMDL-62XXAT/ADT, JMQJ-62XXADT, JMYC-62XXAD, and JMCJ-1003/1005.

    Q: What is the difference between single-point and hydrostatic monitoring?
    A: Single-point gauges measure settlement at a specific embedded point, while hydrostatic systems compare several points against a reference level through connected liquid paths.

    Q: Can the readings be collected remotely?
    A: Yes. Several Kingmach hydrostatic and settlement instruments support RS485 output or automatic acquisition systems for remote collection.

    Q: Why is the reference point important?
    A: Settlement is often calculated relative to a reference. If the reference changes or is poorly documented, the whole settlement curve can become misleading.

Reviews

Joshua Clark

We ordered a full monitoring solution including sensors and data loggers. Everything works seamlessly together. Great supplier!

James Thompson

The tiltmeters and accelerometers are very sensitive and provide precise data. Perfect for our structural health monitoring system.

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