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Online condition monitoring combining the versatility of Ultrasound with the power of Vibration

Online4US utilizes ultrasound and vibration to provide continuous feedback about the health of your factory.


Online4US is a multi-channel online monitoring solution that combines both ultrasound and vibration sensors in 4 to 32 channel modular configurations. It answers a necessary demand to have advanced warning of critical asset failure in remote areas.

Online4US is designed to provide Reliability teams with continuous feedback about the health of their factory’s most critical assets. It combines data from two of the most relevant asset condition monitoring disciplines (Ut/Vib) to provide advanced insight about potential machine failures.

SDT envisioned a need to permanently monitor the condition of critical assets in inaccessible, dangerous, or remote areas. The versatility of Online4US lends its deployment for identifying early stage machine faults before they become catastrophic events.

Online4US is designed to remotely identify these defects and more:

  • Bearing condition monitoring
  • Low speed rotating machine defects
  • On-condition acoustic lubrication
  • Imbalance, misalignment, looseness, coupling and belt wear
  • Pump cavitation
  • Electrical fault detection (partial discharge, corona, tracking, and arcing)
  • Steam trap and valve testing
  • Leak detection (both pressure and vacuum)

Explore your options

Online4US is a modular solution configured to your unique requirements. As your needs change, Online4US changes too. Add measurement channels, inputs, outputs, and communication features. Pay for what you need today with the flexibility to scale the system for the future.

Online4US Configurator

Doug Stangier

“Our maintenance teams have taken a keen interest in the compatibility of utilizing SDT ultrasound instruments and marrying that technology with vibration analysis to get a deeper understanding of our assets and detecting failures prior to them becoming catastrophic. Outstanding products with outstanding people make SDT an awesome part of the maintenance reliability world.”

Doug Stangier – Maintenance Manager, CMRP CRL

Alexandre Vigean “Ultrasonic measurements can detect potential problems on bearings and also confirm assumptions of wear. These functions were successfully identified by SDT and our team during a survey. With this first experience and equipped with our new instrument, we are now able to propose to our customers a survey of their bearings in order to monitor them and to make an early diagnosis of the state of wear of the rotating elements. ”

Alexandre Vigean – Maintenance Engineer, ThyssenKrupp

Online4US Product Brochure:
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Online Ultrasound & Vibration Asset Condition Monitoring

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