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Vibrating Wire Strain Gauges for Bridge, Tunnel & Dam Monitoring: Complete Selection Guide
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Vertical IPI Strings for Accurate In-Place Monitoring
Vertical IPI Strings
Monitoring subsurface movement over months or years calls for instruments that can stay put and keep delivering data. Vertical IPI strings fill that role—fixed in the borehole, they track inclination changes at multiple depths without the need for repeated manual surveys. Kingmach builds these strings with a focus on practical field use: sensors that hold calibration, cable connections that survive tough installations, and segment lengths that match typical project needs. Whether it’s a deep excavation in the city or a remote slope where access is limited, having a string that you can set and forget saves time and reduces safety risks. The data stream goes straight to your logger or cloud platform, so you see movements as they happen, not weeks later.
Technical Detail
Configured around process stability, mold life, and long-term uptime.
Kingmach’s vertical IPI strings use proven sensor technology—typically MEMS or vibrating wire elements—housed in stainless steel or durable composite tubing. Each sensor measures tilt in one or two axes, and multiple sensors are linked in series with rigid rods or flexible couplings. A standard string might cover depths from 10 meters to over 100 meters, with sensor spacing chosen to match the expected failure surface. Installation involves lowering the string into a grooved casing, then backfilling with grout or sand. Once in place, the string connects to a datalogger for automated readings. Kingmach offers a range of standard gauge lengths and can customize string configurations for unusual borehole conditions. The sensors typically have a resolution of 0.01 mm/m or better, and the output signals are compatible with most geotechnical loggers. Since these strings are often used in long-term monitoring, build quality centers on corrosion resistance and waterproof connections. The company’s technical support team can assist with installation planning, data interpretation, and troubleshooting. Given the wide product range, Kingmach will often supply everything from the inclinometer casing to the solar-powered data acquisition system, which cuts down on procurement headaches.
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FAQ
Common technical questions
How do I know what sensor spacing to choose for a vertical IPI string?
It depends on your borehole depth and the zone you need to monitor. For a 20-meter excavation, you might space sensors every 2 meters near the expected slip surface and every 5 meters elsewhere. Kingmach’s engineers can review your site plan and recommend a layout that avoids gaps in the data.
Can vertical IPI strings be used in groundwater monitoring wells too?
Yes, as long as the casing has grooves for the sensors to sit in and the string is rated for submerged conditions. Kingmach’s strings use waterproof connectors and corrosion-resistant materials for wet environments. Just confirm the water depth and chemistry with their technical team to avoid any material mismatches.
What’s the typical lead time for a custom-length IPI string?
Standard strings often ship within a few weeks from stock. Custom configurations may take longer, especially if you need non-standard gauges or cable lengths. Kingmach can usually provide a timeline once they have your specifications, and they’ll prioritize urgent projects where possible.
How do I handle data from a string with 30 or more sensors?
Most dataloggers can handle the channel count, but you’ll need to set up the firmware correctly. Kingmach can supply sample configuration files for common loggers. The output is typically a voltage or frequency that converts to tilt in degrees or mm/m. Their support team can guide you through the first few data runs to make sure everything maps correctly.
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