Bently Nevada 991-01-XX-02-00 MOD:284318-01 Thrust Transmitter

Product Description

The Bently Nevada 991-01-XX-02-00 MOD: 284318-01, also cataloged as the 991 Thrust Transmitter, operates as a dedicated hardware component for shaft axial position measurement within machinery protection and monitoring loops. The device converts proximity probe displacement signals into a 4-20 mA output for thrust position monitoring.

Hardware Specifications

Eddy-Current Probe Scaling and Thrust Monitoring

The Bently Nevada 991 transmitter processes eddy-current probe displacement signals through integrated Proximitor electronics. The unit maintains probe scaling characteristics and converts shaft axial movement into a proportional 4-20 mA current loop signal.

The transmitter supports gap voltage validation through the Proximitor output terminals. During commissioning, technicians typically verify probe operating conditions against standard Bently Nevada gap voltage targets, including approximately -10 VDC for nominal probe positioning.

The design also supports rotor dynamics monitoring applications by providing access to dynamic signal terminals. The non-isolated PROX OUT and COM connections allow diagnostic measurement of vibration-related signals and probe operating conditions.

Frequently Asked Questions

Q: Does the Bently Nevada 991 require an external Proximitor module?
A: No. The 991 integrates the Proximitor electronics inside the transmitter housing and directly accepts a compatible 3300 NSv proximity probe with extension cable.

Q: What type of output does the 991 transmitter provide?
A: The device provides a 4-20 mA loop-powered output proportional to measured thrust position displacement.

Q: How does the transmitter indicate probe or wiring faults?
A: The transmitter includes a Not OK / Signal Defeat circuit that reduces the output below 3.6 mA within approximately 100 us during fault conditions.

Field Installation Guidelines

• Install the transmitter in a location protected from excessive vibration, moisture intrusion, and mechanical impact.
• Use the specified Bently Nevada 3300 NSv probe and matching extension cable for correct signal scaling.
• Maintain proper cable routing separation from high-current power conductors to reduce electrical interference.
• Connect shielded signal wiring according to site grounding practices and avoid multiple grounding points.
• Verify probe gap voltage before placing the monitoring loop into service.
• Confirm zero and span adjustment settings during calibration to match the required thrust measurement range.
• Check terminal connections, probe wiring continuity, and loop current response before operational startup.

Other Attributes

• Series: 24765 and 135613 Case Expansion Transducer Systems
• Country of Origin: USA
• Lead Time: In Stock, 2 Working Days

In Stock Hot Items of The  Bently Nevada

Our Competitive Brands

• - ABB Advant-800xA，Advant OCS，Bailey Infi 90 and Net 90，H&B Freelance 2000，DSQC Robots，IGCT / IGBT
• - GE General Electric Field Control, Genius I/O, QuickPanel, RX3i PacSystem, Series 90, Series 90, Series VersaMax
• - Allen Bradley Allen-Bradley SLC500, MicroLogix, CompactLogix, ControlLogix, PLC-5, Panel View,
• - Bently Nevada 3300 System, 3500 System
• - Honeywell 7800 Series, FSC, IPC, Mxopen, TDC 2000, TDC 3000, Experion PKS(C200,C300)
• - Yokogawa Centum CS - Centum VP, Centum XL - micro XL, FA-M3, ProSafe-PLC
• - Ovation, Foxboro, EPRO, Emerson DeltaV, Fuji, Siemens, HIMA, Prosoft, Invensys Triconex, ICS TRIPLEX, Woodward, Bachmann, Schneider

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