Redundant / Dual Mounting Core Extension Rods Position Sensors

The redundant dual mounting core extension rod assembly allows two LVDT or LVIT sensors to share a single mechanical connection to the measured object, ensuring that both sensors track the same position simultaneously. This hardware is used with stacked or dual-mounted sensor configurations in safety-critical applications where redundant position measurement is required and both sensors must see exactly the same mechanical input — a condition that is not guaranteed when two sensors are mounted at different points along an actuator rod.

Mechanical Basis for True Redundancy

In a redundant sensor system, the value of redundancy depends on whether the two sensors measure the same quantity independently. Two sensors mounted at different axial positions on a valve stem do not measure the same quantity — they measure positions that differ by the deflection of the stem between the two mounting points, which varies with stem load and temperature. The common core extension rod assembly eliminates this ambiguity by ensuring that both sensor cores are mechanically coupled at exactly the same point on the actuator, so any discrepancy between their outputs reflects a sensor fault rather than a real measurement difference.

Compatibility and Application

The redundant core extension rod assembly is designed to mate with ASG's standard LVDT and LVIT body formats, using the same threaded coupling interfaces as the individual sensor accessories. Application is primarily in steam turbine valve control systems, nuclear plant monitoring, and aerospace actuator position feedback — any application where the regulatory or safety basis requires verified redundancy in position measurement and where a failed sensor must be distinguishable from a genuine position discrepancy.