crack gauge monitor

Kingmach’s crack gauge monitors measure the relative displacement between two points, typically across a crack or joint. The sensing element can be a vibrating wire, potentiometric, or linear variable differential transformer (LVDT), depending on the precision and environmental conditions your project demands. We stock vibrating wire models for long-term, stable readings in dams and underground structures where temperature changes might skew data. Potentiometric versions offer a simpler, cost-effective option for surface monitoring on buildings or temporary works. LVDT sensors give high resolution and fast response, useful in dynamic situations like blast monitoring or structural load tests. Every crack gauge monitor comes with mounting blocks, a protective cover, and a signal cable. You specify the gauge length — it can range from 50 mm to 500 mm — and we calibrate the sensor to that range. If you’re dealing with a curved surface or need to mount the gauge in a tight corner, we can modify the brackets. Outputs are available in standard formats: 4-20 mA, RS-485, or SDI-12, so integration with your existing data acquisition system is straightforward. Typical applications include monitoring cracks in concrete dams, tunnel linings, bridge piers, and historical buildings. Geotechnical consultants also use them to track slope deformations, either on the surface or in boreholes. One installer recently told us they pair a crack gauge monitor with a datalogger to automatically send SMS alerts if a crack opens beyond a predefined threshold — reducing the need for frequent site visits. We don’t claim to reinvent the wheel, but we do focus on robust construction, reliable calibration, and making sure the data you get is consistent. With distribution partners in 30+ countries, we can deliver quickly, and our support engineers are available to walk your team through setup if questions come up.