Marine Electric Systems proximity sensors are electrical position sensing devices with no moving parts which makes them extra-ordinarily reliable. Proximity sensors are designed to replace ordinary mechanical limit switches and employ one of two technologies, Eddy Current Loss (ECL) or Variable Reluctance (VR).
ECL devices “sense” metals and when a metal target is brought into the proximity of alternating magnetic field generated by the sensor, a solid state output device is actuated. A VR sensor detects metal targets attracted to a magnet and therefore can detect through non-magnetic materials like titanium or stainless steel.
Proximity sensors are non-invasive. For example, they can be used to detect the position of a piston inside a hydraulic cylinder under pressure – there is no need to penetrate the cylinder wall. They’re also fast. ECL sensors can detect 200 actuations per second without switch bounce, and VR sensors 10,000 actuations per second – a feat no mechanical device can match. Finally, proximity sensors offer an extended life cycle, added capabilities and an absence of moving parts for a considerable value advantage.