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November 20, 2025
Category Connection: Bently Nevada
Brief: In this video, we explore the Bently Nevada 991-01-XX-01-CN Thrust Transmitter, a 2-wire, loop-powered device designed for axial displacement monitoring in industrial machinery. Watch as we demonstrate its 4-20 mA signal output, diagnostic capabilities, and rugged construction suitable for high-humidity environments.
Related Product Features:
  • 2-wire, loop-powered transmitter with 4-20 mA industry-standard signal output for axial displacement monitoring.
  • Compatible with 3300 NSv Proximity Probe, offering dynamic vibration and gap voltage outputs for diagnostics.
  • Integrated design eliminates the need for an external Proximitor Sensor, simplifying installation.
  • Easy calibration with zero and span potentiometers located under the transmitter label.
  • Test Input pin enables rapid loop output verification using a variable DC voltage source.
  • Power-up inhibit circuit prevents signal errors caused by line voltage transients.
  • Supports DIN-rail or bulkhead mounting, with both options included as standard.
  • Fully potted housing ideal for high-humidity environments (up to 100% condensing).
FAQs:
  • What types of machinery is the 991 Thrust Transmitter suitable for?
    The 991 Thrust Transmitter is designed for centrifugal air compressors, small pumps, motors, and fans requiring axial displacement monitoring.
  • How does the 991 Thrust Transmitter handle probe faults or loose connections?
    It features a Not OK / Signal Defeat circuit to prevent false alarms and high outputs due to probe faults or loose connections.
  • What are the extension cable options available for the 991 Thrust Transmitter?
    The transmitter supports system lengths of 5 m and 7 m with compatible extension cables.