A client of ours has a 90 m concrete retaining wall above the access road to their battery storage site, and after a wet winter the civil engineer wants it monitored. Installed so far: 24 vibrating-wire strain gauges embedded in pairs, each with its own thermistor, read by a data logger with Modbus RTU. Our gateway polls the logger and reports to Hermetry.
Two problems.
The readings swing about 60 microstrain every day, up in the afternoon, down at night. The engineer says that’s mostly temperature and wants “load strain” separated from it before anyone sets alarm limits. I’ve seen formulas with two coefficients and I’m not sure which is which.
And at the moment the 24 gauges are just 24 devices in a flat list. The client’s engineer thinks in wall sections (A to F, four gauges each). How do I make Hermetry show it his way?
Why does the concrete expanding with heat count as strain if nothing is pushing on it? Sorry if that’s a silly question.
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