Ultrasonic vibration sensor
RS1 Threaded
SDT International
Defects on rotating machine produce a broad sound spectrum and they are usually monitored by vibration in low frequency. However some specifics defects produce acoustic waves with a rich content in high frequencies: impacting for bearings and gearboxes, friction or rubbing for lubrication and cavitation for pumps. Consequently, one of the significant advantages of ultrasound, compared to vibration analysis, is to easily monitor bearing and gearbox degradation which could be masked in low frequency analysis.
Moreover, the use of ultrasonic resonant sensors acts as a mechanical amplifier of high frequencies. In addition, the SDT270 device has an excellent signal-to-noise ratio which allows detection of weak variations from background vibrations.
The result is that ultrasound technology is a very selective method highlighting at an early stage these defects against low frequency problems with also a great effectiveness in low speed equipment monitoring.
RS1 Treaded contact sensor
The RS1 Threaded contact sensor has the better sensibility and measurement repeatability. It is certainly the best type of sensor for machine monitoring. This structure-borne ultrasonic sensor is recommended for dynamic measurement acquisition. However, its use requires to fix a stud on each point of measurement. It is also an excellent choice for the inaccessible or potentially dangerous measurement locations and it should be used in priority for low speed bearings.
This sensor is also available in ATEX certified version (Directive 94/9/EC: II 1 G Ex ia IIC T3/T2 Ga).
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