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Crack Meter
Kingmach Crack Meter include the JMDL-21XXAT Smart General-Purpose Displacement Meter, a compact instrument for relative displacement and expansion joint movement. The product is used in buildings, railways, transportation works, hydropower structures, dams, and bridge projects where two structural components may move against one another. Listed ranges include 50 mm and 100 mm, with 0.01 mm resolution and 0.5%FS accuracy. The meter is based on inductive frequency modulation, which supports high sensitivity, stable long-term observation, and low temperature influence. A built-in memory chip stores sensor model, serial number, calibration coefficient, time, temperature data for temperature versions, absolute displacement, relative displacement, and zero-point value. It can save 800 measurement results, which is useful when checking site history after construction stages or weather events. When connected to an integrated tester or automatic acquisition system, readings can be reviewed quickly without relying on manual gauge notes. During project setup, the measuring point should be matched with the expected travel direction, available mounting space, cable route, and required acquisition interval. This prevents a short-range joint instrument from being used on a long-travel point, or an exposed sensor from being placed where an embedded anchor is needed. It also helps the monitoring team set a baseline that can be defended during acceptance and later maintenance review.
Application of Crack Meter
In integrated structural health monitoring, Crack Meter act as the movement layer inside a wider measurement network. Their role is to show where a point has shifted, how fast the shift is developing, and whether the change agrees with other instruments. Kingmach displacement products can feed digital records into acquisition units and monitoring platforms, while related Kingmach product groups provide strain, load, settlement, tilt, vibration, pore pressure, water level, rainfall, data logging, cables, and software. A practical system may use JMDL-52XXADT meters for precise joint travel, JMDL-31XXAT meters for rock layers, JMDL-24XXAT meters for buried geogrid deformation, and JMLS-22XXADT sensors for longer cable travel. The data chain should define point names, units, zero values, sampling intervals, warning grades, and inspection actions before alarms are enabled. This prevents a displacement curve from becoming an isolated chart. Instead, the reading can be checked beside force, strain, settlement, temperature, rainfall, and construction records, giving engineers a clearer basis for maintenance and warning review. During commissioning, each curve should be verified against the physical point so later reports can be trusted by site teams, designers, and owners. The same record should also note cabinet number, logger channel, cable tag, power supply, and communication route, because many long-term data problems begin outside the sensor body.
The future of Crack Meter
The future of Crack Meter will be shaped by connected monitoring rather than isolated field readings. Kingmach products already include digital detection, RS485 communication on selected models, built-in memory, stored calibration data, and compatibility with automatic acquisition systems. The next practical step is cleaner connection between the sensor identity, the monitoring point, and the platform curve. A displacement value should arrive with its model, serial number, range, calibration coefficient, zero value, temperature, and installation position. That will reduce channel errors and make later review faster. In bridges, tunnels, dams, slopes, and foundation pits, future systems will compare displacement with strain, load, tilt, settlement, rainfall, water level, and construction events. Warnings will depend less on a single limit and more on the pattern of movement across several related sensors. The strongest systems will still depend on careful installation, because digital tools cannot correct a loose bracket, wrong range, or poorly recorded baseline. Clear reporting will make displacement monitoring more useful for non-specialist decision makers while preserving the detail engineers need.
Care & Maintenance of Crack Meter
For formwork and construction-stage Crack Meter, inspection frequency should match the work rhythm. Kingmach JMDL-49XXAT formwork displacement meters may be used during concrete pouring, steel pipe support monitoring, tunnel portal movement, slope sliding, dam displacement, or railway subgrade monitoring. The product lists IP68 protection, 0.01 mm sensitivity, 0.5%FS accuracy, and a 30-year service life, but construction sites can still damage connectors, brackets, and cables quickly. Before pouring, confirm the zero reading, bracket tightness, cable route, warning level, and acquisition interval. During pouring or loading, watch for sudden jumps that match pump movement, support adjustment, or worker contact. After the stage is complete, inspect whether the sensor was knocked, buried, or moved. Keep time and temperature records with displacement readings because short-term construction movement can be different from long-term structural deformation. Keep the installation photo, point number, zero value, and expected movement direction with the commissioning record for later review. If a reading changes after maintenance work, inspect the base, anchor, cable, and cabinet before assuming the structure itself has moved.
Kingmach Crack Meter
Crack Meter support safer engineering decisions when the reading is tied to a clear location, a known baseline, and a repeatable acquisition method. Kingmach products list practical field details such as 0.01 mm resolution on several JMDL models, 0.5%FS accuracy on general-purpose, crack, flexible, and formwork models, plus 0.1%FS accuracy on the differential JMDL-52XXADT series. Protection ratings such as IP67 and IP68 help when instruments are exposed to dust, water, concrete work, or outdoor cabinets. RS485 output on digital models allows remote data transfer, while memory functions keep calibration and measurement data close to the sensor. In bridges, buildings, hydropower works, tunnels, railways, slopes, and foundation pits, those details reduce the gap between a specification sheet and actual monitoring work. The better the field record, the faster abnormal movement can be checked. The point should be named on the drawing, linked with its cable route, and checked against the expected movement direction before the first automatic reading is accepted. For daily review, the reading should be compared with nearby points, recent weather, site operations, and any loading event that could explain the movement.
FAQ
Q: Which Crack Meter are used for rock layers or bedrock?
A: JMDL-31XXAT multipoint meters are used for different surrounding rock layers, while JMDL-32XXAT single-point bedrock meters are used for tunnel rock mass, dam bedrock, slope, or foundation pit movement.
Q: How many points can the multipoint meter support?
A: The multipoint installation kit supports three to five monitoring points, with anchor heads fixed at different depths by drilling and grouting.
Q: What ranges are listed for these models?
A: Both JMDL-31XXAT and JMDL-32XXAT list 50 mm, 100 mm, and 200 mm models with 0.01 mm resolution.
Q: Why monitor several depths?
A: Different layers may move differently. Separating shallow and deep movement helps engineers judge whether the problem is surface creep, deeper rock slip, or overall mass movement.
Q: What records should be kept?
A: Keep drilling depth, anchor location, grouting date, channel name, zero value, cable route, and first stable reading.
Reviews
Andrew Lee
The visualization software is intuitive and powerful. It helps us analyze monitoring data efficiently.
Matthew Garcia
Instrumentation cables are durable and perform well even in harsh environments. Will definitely order again.
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