The Bray KCA sensor is a cable-actuated linear position sensor designed for use with Bray knife gate valve actuators. It provides an analog current output, available in either 4-20mA or 0-20mA ranges.

The KCA sensor uses an absolute encoder sensor to measure the distance between an object and a point of reference, as well as changes in position. The sensor converts displacement into an electrical output. The linear-to-rotary-to-linear (LRL) mechanism forms the axis of a recoil spool mechanism.

The spool uses a polymer-coated, stainless-steel cable to form a reliable, repeatable coupling between the piston and the sensor. Anchoring the connector to the piston causes the cable to wind or unwind from the spool as the piston rod retracts or extends, respectively. The assembly also offers extreme immunity to shock, vibration, and environmental factors, regardless of stroke length.