crack gauge

On a concrete spillway, a hairline crack might not look like much, but if water gets in and freeze-thaw cycles start, it can grow fast. A crack gauge installed across the joint tells you exactly when that movement happens. At Kingmach, we build instruments to catch those changes early. Our crack gauges use vibrating wire or potentiometric sensing, and we offer both single-axis and triaxial configurations. Key features include robust stainless steel bodies, IP68 sealing for submersion, and built-in thermistors for temperature correction. You can order standard ranges from 0–10mm up to 0–100mm, but if your crack is wider or narrow, we can adjust the range. The output signal is frequency or voltage, compatible with most data loggers and automatic monitoring systems. We’ve supplied crack gauges for: dam galleries, where humidity is near 100%; underground excavations, where space is tight and the gauge needs to survive blasting; and slope stability studies, where the gauge is embedded in soil or rock. In each case, the gauge had to be customized—maybe a longer cable, a different anchor type, or a desiccant chamber for humidity control. We also offer mounting accessories: groutable anchors, extension rods, and protective covers. Since we manufacture in-house, we can turn around custom orders quickly, often within a few weeks. After delivery, we provide setup support and calibration data. For long-term monitoring, we recommend pairing the gauge with a data acquisition system, which we can also supply. Need help picking the right gauge for your project? We’re used to answering technical questions, from linearity specs to zero-shift under temperature cycling.