PR6423/005-030+CON021 Eddy Current Displacement Transducer

The PR 6423 is a non-contact eddy current transducer with a rugged construction and designed for extremely critical turbomachinery
applications such as steam, gas, compressor and hydro turbomachinery, blowers and fans.
The purpose of a displacement probe is to measure position or shaft movement without contacting
the measured surface – the rotor. In the case of sleeve bearing machines, the shaft is separated
from the bearing material by a thin film of oil. The oil acts as a dampener and therefore the
vibration and position of the shaft are not transmitted through the bearing to the bearing case.

The use of case vibration sensors is discouraged for monitoring sleeve bearing machines since the
vibration produced by shaft motion or position is greatly attenuated through the bearing oil film.
The ideal method of monitoring shaft position and motion is by mounting a non-contact eddy
sensor through the bearing, or inside the bearing, measuring the shaft motion and position
directly. The PR 6423 is commonly used to measure vibration of machine shafts, eccentricity, thrust
(axial displacement), differential expansion, valve position, and air gaps.