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Vibration Sensor Node (SD-VSN-2)

The heart of the SmartDiagnostics® system, Vibration Sensor Nodes are at home in the most inaccessible, inhospitable corners of your facility, monitoring your machine health quickly and accurately.

vibration sensor node

What's New In Version 2?

Version 2.0 Vibration Sensor Nodes have twice the range, higher sampling frequency, and are two and a half times more robust than before. The sensors can easily transmit a higher density of data using DARTwireless, and are powered by a CR123A battery. In a layout that can be configured for any plant or environment, as many as 100 sensor nodes can now send vibration data to each receiver. The sensors can be tuned to transmit data on the frequency you select, and monitoring bands can be customized to alarm levels that you choose, ready to caution or warn you immediately when frequency rises to a level you specify.

The SmartDiagnostics® Network

Vibration Sensor Node role in Smart Diagnostics Network


Vibration Sensor Nodes provide health monitoring in the most hard-to-reach, rugged locations. Each node communicates via a direct wireless link to a Primary Receiver Node, from which the data is imported into SmartDiagnostics® Software for viewing and analysis.


The system is highly configurable and scalable. A system can have hundreds of sensor points, each of which can be configured to transmit data on a user-selected frequency, and unique indicators can be implemented to warn users of potential machine health issues.


Easily installed without the downtime, expense, and labor costs of old-fashioned, hard-wired sensors. Simply place the sensors where you need them and within minutes they’ll transmit data. SmartDiagnostics® can predict failure before it occurs, saving money spent on unnecessary replacements and extending machine life. At the same time, energy costs are reduced, as properly maintained machines are more efficient.


  • Optimized for long battery life
  • Full time series data sets up to 5 times per minute
  • Expandable to hundreds of nodes per system
  • Accurately monitors vibration and temperature in a variety of locations.
  • Allows wireless communication for instant results and efficient operation.
  • Robust industrial-grade design allows vibration sensor nodes to be reliably used in harsh industrial environments.
  • Very easy installation – no wires, no tools – locate, place and go.


  • Cooling Towers
  • Pumping Stations
  • HVAC/R System Equipment
  • Paper & Metal Manufacturing
  • Power Plants
  • Food & Beverage Production Facilities
Dimensions1.87 in diameter x 2.04 in height (47.5 mm x 51.8 mm) excluding antenna
Weight4.1 oz (115 g)
Enclosure MaterialAnodized aluminum and high-strength polycarbonate
Storage Temperature-40 to 238 °F (-40 to 120 °C)
Min. Operating Temp.-4 °F (-20 °C)
Max. Operating Temp.230 °F (110 °C) surface @ 72 °F (22 °C) ambient
212 °F (100 °C) surface @ 105 °F (40 °C) ambient
167 °F (75 °C) surface @ 167 °F (75 °C) ambient
IP RatingIP65, dust-tight and impervious to water jets
Impact ResistanceSurvives 5-ft drop onto concrete surface
Hazardous CertificationClass I, Division 2, Groups A-D, T5 (model SD-VSN-2N)
Wireless Radio
RadioKCF DART Wireless 2.4GHz ISM band, FCC ID #Z5ISD2
Range800ft (244m) line-of-sight (site survey recommended for installation).
Repeater SD-R adds 2400ft (730m) of range.
AntennaSteerable antenna, providing 360° directional coverage.
Power Source3-Volt Lithium Manganese Dioxide (CR123A)
Battery LifeFull spectrum acquisition every:
  • 60 minutes - 8 years
  • 15 minutes - 6 years
  • 2.5 minutes - 2 years
Note: battery life is somewhat reduced at extremely cold temperatures
Range+/- 19 g typical, +/- 16 g nominal
Resolution13 mg nominal with individual NIST-traceable calibration
Noise Floor5 mg RMS @ 256 Hz / 19 mg RMS @ 8192 Hz
Transverse Sensitivity10% Typical
Frequency Response+/- 5% 0-2700 Hz, +/- 3 dB 2700-4000 Hz
Samples per Acquisition1600
Spectral Lines800
Anti-Aliasing Filter4000 Hz low-pass cut-off, 3rd-order Sallen-Key
Sampling frequency64 Hz – 8192 Hz configurable
Temperature Sensor
Range-4 to 167 °F (-20 to 75 °C)
Resolution+/- 1 °F (+/- 0.5 °C)

Battery Life

The VSN is designed to be very energy efficient so that it can operate continuously for many years when powered by a 3.6 Volt battery.

The actual amount of power consumed (and therefore the effective battery life) is dictated by two factors:

  1. The frequency at which the sensor sends a heartbeat ping to the PRN, and
  2. The frequency at which the sensor collects and transmits vibration data to the PRN.

The heartbeat ping takes very little energy so the primary driver of battery life is governed by the vibration data collection frequency which you configure based on your business needs. The graph below illustrates how battery life varies with changes to collection frequency assuming the sensor heartbeats every four seconds.

battery life graph

Battery Life vs. Vibration Data Collection Frequency

VSN Mechnical Drawing

Vibration Sensor Node Mechanical Drawing

Federal Communications Commission Compliance ‒ FCC Class B Device Statement The radio equipment in the SmartDiagnostics Receiver Nodes and SmartDiagnostics Sensor Nodes has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. Hazardous Location Information ‒ The SmartDiagnostics Vibration Sensor Node model SD-VSN-2N is certified to be suitable for use in Class I, Division 2, Groups A,B,C,D or non-hazardous locations only.


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