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settlement gauges
Kingmach settlement gauges also cover the JMQJ-62XXADT micro range hydrostatic level sensor, a compact instrument for small vertical deformation where fine reading stability matters more than large travel. The product page lists 50 mm and 100 mm ranges, 0.01 mm resolution, 0.5%FS accuracy, RS485 digital signal, DC 9V to 24V power, power consumption below 0.4W, IP68 protection, about 4.5 kg weight, temperature drift of plus or minus 0.001 mm per degree Celsius, and annual stability of plus or minus 0.1%FS. Typical sites include tunnels, subgrades, dams, bridges, slopes, and building foundations. Because the measuring span is small, installation quality has a strong effect on the usefulness of the readings. The installer should keep the mounting surface firm, shield the cable gland from standing water, protect the pipe connection, and label each sensor before cabinet wiring. Acceptance should include zero confirmation, response comparison between nearby locations, enclosure inspection, and a saved baseline table. For wet galleries, buried sections, or tunnel invert areas, the IP68 enclosure and low power demand help the instrument remain practical when access is limited. This model fits monitoring programs where gradual millimeter-scale movement must be recorded through long wet or buried service conditions.
Application of settlement gauges
In foundation pit projects, settlement gauges are used during staged excavation to track base uplift, nearby pavement settlement, groundwater response, and vertical movement around retaining systems. The timing of each value matters because deformation may change after dewatering, support installation, soil removal, rainfall, or backfilling. Kingmach JMDL-47XXAT can be embedded to follow base uplift or local settlement, while JMCJ-1003/1005 can read magnetic ring depth and groundwater level in boreholes. Hydrostatic instruments may be added where several elevations around the pit need comparison against a reference. The site team should record excavation depth, support level, water pumping condition, adjacent road or building observations, and first stable baseline beside the settlement curve. If movement grows quickly, the response should include checking the sensor and reference first, then comparing support force, wall displacement, groundwater, and visual inspection before deciding whether excavation can continue. This keeps settlement review tied to the actual construction sequence, which is essential because a pit may behave differently at each excavation depth and support stage. A clear record also helps distinguish base rebound from surrounding ground loss or reference disturbance. The review file should also include reference condition, recent site work, nearby sensor behavior, and inspection notes so later teams can interpret the curve clearly.
The future of settlement gauges
The future of settlement gauges will include cleaner digital handover records. Settlement monitoring often lasts longer than the construction team stays on site, so owners need more than a table of values. A useful handover file should include model, serial number, range, reference point, tube route, ring depth, baseline, installation photo, cable tag, borehole number, and first stable reading. Kingmach products such as JMDL-47XXAT and JMCJ-1003/1005 especially benefit from this because embedded rods, magnetic rings, anchors, and borehole readings may be hard to inspect later. When that information is stored with the curve, maintenance teams can understand why a point was installed and how its settlement should be interpreted years later. Future records should make the instrument history as visible as the measurement itself, so old readings can still be trusted after staff changes, repairs, and new construction stages.
Care & Maintenance of settlement gauges
Trend review for settlement gauges should include the surrounding engineering story. Settlement may respond to filling height, excavation depth, dewatering, rainfall, groundwater, reservoir level, traffic loading, concrete curing, or nearby construction. A sudden change may be real, but it may also come from disturbed tubes, moved reference points, loose cables, weak batteries, or manual reading error. Compare each curve with nearby displacement, tilt, strain, load, pore pressure, and water level data when available. For long-term projects, review rate of change as well as total settlement. A small value that keeps accelerating may matter more than a larger value that has stabilized. Maintenance staff should flag date, likely trigger, nearby work, inspection result, and follow-up action in the same record. That habit makes the curve useful during design review, safety meetings, and later handover.
Kingmach settlement gauges
In underground works, settlement gauges help separate vertical movement from the noise of excavation, support installation, groundwater, and nearby traffic. Tunnel bottom uplift, subway station settlement, foundation pit base heave, and adjacent ground movement can all affect construction safety. Kingmach JMDL-47XXAT is described for tunnel bottom uplift and base uplift in deep foundation pits, while hydrostatic products can compare several elevations across a station or tunnel section. The monitoring plan should define which reading triggers inspection, who receives the alert, and what nearby data should be checked. Settlement should be reviewed with displacement, support force, water level, tilt, and visual inspection. That wider view keeps a single curve from being overread or ignored. For critical infrastructure, the settlement point should be part of a wider review with displacement, tilt, strain, load, rainfall, and groundwater information. For critical infrastructure, the settlement point should be part of a wider review with displacement, tilt, strain, load, rainfall, and groundwater information.
FAQ
Q: What is JMCJ-1003/1005 used for?
A: It is used to measure layered underground settlement and groundwater level in foundations, subgrades, foundation pits, embankments, and underground structures.
Q: How does magnetic ring settlement reading work?
A: Magnetic rings are placed underground; when the probe senses a ring, audible and visual alerts help the operator read depth from the steel tape at the borehole.
Q: How is water level detected?
A: The water level component works by water conductivity and alerts when the probe contacts water.
Q: What accuracy is listed?
A: The listed measurement accuracy is plus or minus 1 mm.
Q: What field records are needed?
A: Keep borehole number, magnetic ring depth, previous reading, current reading, groundwater level, and operator notes together.
Reviews
Daniel Brown
Excellent environmental monitoring sensors. The data is consistent, and the system integrates smoothly with our existing setup.
Ryan Lewis
Fast delivery and excellent product quality. The accelerometers and tiltmeters are highly reliable. Strongly recommend this company.
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