Abstract: A rotating control device includes a housing with a sensor port extending to a central housing bore, a sensor in the port, and a rotating sleeve assembly (RSA) extending within the central bore. The RSA includes a sleeve configured to rotate relative to the housing and a second bore coaxially aligned with the central bore of the housing, A piston port in the sleeve extends to the second bore, and a piston disposed in the piston port is configured to reciprocate between a first position and a second position in response to a change in pressure of fluid within the second bore. The piston port and the piston are disposed at a location in the rotating sleeve that passes the sensor periodically when the rotating sleeve rotates; the sensor configured to detect the piston when it rotates past the sensor and is in its second position.

Abstract: A rotating control device for sealing an annulus includes an outer housing, and a seal assembly disposed within the outer housing and configured to seal against a rotating tubular member extending axially through a throughbore of the outer housing, wherein the seal assembly includes an inner housing, a first proximity sensor disposed along an inner surface of the outer housing, and a first sensor element disposed along an outer surface of the inner housing, wherein the first proximity sensor is configured to measure the rotational speed of the seal assembly in response to rotation of the seal assembly in the outer housing.