cable displacement sensor

Cable sensors handle off-axis movement and misalignment better. If the measurement point moves in a non-linear path or the mounting points are not perfectly aligned, a cable sensor is less likely to bind or give false readings. Rod-type transducers are more rigid and suit straight-line measurements with stable alignment.

With an IP67 body and sealed cable gland, they manage temporary submersion and high humidity. For continuous underwater use, we add double O-ring seals and a hydrophobic vent. Let us know the depth and duration so we can confirm compatibility.

The wire is made of high-tensile stainless steel, usually rated for 10–20 kg pull. In a snap, the internal spring retracts the remaining wire, and the sensor likely goes to a fault state (e.g., reading drops to zero or hold). Our designs include a guide ring to contain a broken wire and prevent damage to the drum. Replacement wires are field-installable.

We don’t make the sensor itself wireless, but we pair it with a separate LoRa or NB-IoT node. The sensor output (e.g., 4-20mA or RS485) feeds directly into the node. It’s a modular approach—cheaper to replace parts and easier to maintain than a fully integrated wireless sensor.

We recommend a yearly check against a known displacement standard, especially on critical structures. The encoder-based models drift very little (<0.01%/°C), so many projects go 2–3 years without significant deviation. Always test after the wire is replaced or if the unit has taken a physical hit.