vibrating wire rebar strain meter

A vibrating wire rebar strain meter operates on a simple principle: a tensioned wire inside the sensor changes its natural frequency when the surrounding steel deforms. That frequency is immune to electrical noise and doesn’t drift over time the way electrical resistance gauges sometimes do. You weld the instrument’s end flanges to the rebar—or use couplers for larger diameters—and pour concrete over it like normal. After curing, any load that changes the rebar length alters the wire tension, giving you a clean, repeatable reading. Kingmach supplies these strain meters in several standard sizes to fit common bar diameters, and we can adjust flange dimensions for unusual rebar schedules. Most units include a built‑in thermistor so you can separate thermal expansion from mechanical strain without running extra wires. The body is sealed against moisture and grout intrusion; in practice, this means the sensor can sit in water‑saturated concrete for years. Output is a frequency signal, compatible with almost any vibrating‑wire readout unit or data logger. Because we’re a dedicated manufacturer, not a reseller, we can support custom projects directly—think non‑standard gauge lengths for small‑diameter piles, or special cables for high‑temperature environments. Our support engineers are used to working with contractors who need quick‑turn submittals, and we keep calibration sheets organized by serial number for traceability. If your project spans multiple countries, our logistics team handles export documents and local delivery.