tiltmeter use

Getting consistent results from a tiltmeter starts well before the probe goes in the hole. The casing installation is where many projects stumble. It needs to be firmly grouted, with no voids or flexing, and the groove alignment must be checked with a dummy probe before the real survey begins. Kingmach casings often come with alignment fins that make this easier, but the general principle applies regardless of the brand: if the casing moves independently of the surrounding ground, the tilt readings won’t reflect true displacement. Once the casing is in place, the actual tiltmeter use routine is straightforward. Lower the probe slowly to the bottom, let the temperature stabilize for a couple of minutes, and then start pulling up in increments—typically 0.5 or 1 meter, matching the wheel spacing. Each reading should be taken twice, rotating the probe 180 degrees to cancel out any bias. The sum of the two readings divided by two gives the true inclination at that depth. Skipping the rotation, or not waiting for temperature equilibrium, are two of the most common causes of data scatter. Beyond the technical steps, good tiltmeter use also demands attention to environmental factors. Cables should be kept clean and dry, and the probe’s wheels should be inspected for wear after every few surveys. Kingmach provides probes with replaceable wheel assemblies for this reason, but even a tiny bit of debris in the groove can cause erratic profiles. Many experienced users also run a quick check survey with a known stable borehole to catch any drift in the sensor before starting a long-term monitoring project. Over time, these small habits build a dataset that engineers can actually trust for slope stability, foundation monitoring, or excavation control.