New eddy current probe

Published:  29 July, 2007

Sensonics range of Senturion Proximity Probes has recently been extended to include a new instrument capable of operating to temperatures of 240C.

Used widely throughout industry to monitor rotating shaft alignment and axial position, particularly on steam and gas turbines, centrifuges and pumps, Sensonics proximity probes provide a range of non-contacting measurement configurations and comply with the API 670 standard.

Available in a selection of body and cable lengths, the new PRS05 model from Sensonics offers a 0 to 5mm measurement range in a 12mm tip (M18 body) configuration and operates above the range of standard probes, which can experience excessive drift where temperatures exceed 150C and typically will be manufactured in materials only suitable for occasional operation up to 200C.  Temperatures in many applications can rise above this 200C ceiling for long periods at a time in the locality of the probe; during turbine run up where steam leaks are prevalent, it is key the measurement accuracy is maintained for both thrust and shaft vibration measurements as the turbine thermal characteristics stabilise.  The new PRS05 solution maintains a measurement error of less than 5% over the full working temperature range. 

The new probe incorporates a glass filled PPS bobbin case rated to 300C, which is both oil and chemical resistant. A bobbin expansion chamber and wire strain relief techniques for the cable interface are just two of the design enhancements incorporated to achieve the 240C rating.   The instrument is supplied with a standard 0.5m of high temperature PTFE cable and is used in conjunction with a coaxial extension cable, supplied as a tuned system with a driver unit.

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