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Bently Nevada 990 and 991 Transmitter
Even though many 990 and 991 Transmitter models are discontinued, we continue to support multiple generations of 990 and 991 Transmitter systems.
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- 990 and 991 Transmitter
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3300 System3500 System330400 and 330425 Accelerometer3300 XL 8mm Proximity Transducer3300 XL NSV Proximity Transducer190501 Velomitor CT Transducer200150, 200155 and 200157 Accelerometers990 and 991 Transmitter31000 and 32000 Proximity Probe Housing Assemblie21000, 24701, and 164818 ProbeHousing Assemblies3300 XL 11mm Proximity Transducer330500 and 330525 Piezo-Velocity Sensor7200 Proximity Transducer SystemsIEPE Accelerometer Series170180 FieldMonitor External Transducer I/O Module330525 Series330750 and 330752 High Temperature Velomitor1900 Vibration Monitor3701 Machinery Dynamics Monitor24765 and 135613 Case Expansion1701 FieldMonitor Proximitor Input Monitor2300 Vibration Monitors9200 and 74712 Seismoprobe Velocity Transducers3300 XL Proximity Transducer21500 TDXnet Transient177230 Seismic Transmitter1900/65 General Purpose Equipment MonitorTK-3 Proximity SystemORBIT 60 Series
Bently Nevada 990 and 991 Transmitters
Rotating machinery failures rarely announce themselves — they build quietly through undetected vibration shifts and axial drift until a bearing seizes or a shaft overloads. The Bently Nevada 990 Vibration Transmitter and 991 Thrust Transmitter series exist to catch those signals early, converting mechanical motion data into standardized 4–20 mA outputs that feed directly into protection and monitoring systems.
Amikon stocks both series, including discontinued and hard-to-find part numbers, to keep your equipment running without waiting on slow procurement cycles.
990 Series: Vibration Monitoring for Rotating Equipment
The 990 series converts raw vibration signals from rotating machinery into standardized 4–20 mA transmitter outputs compatible with DCS, PLC, and dedicated protection systems. It measures peak-to-peak vibration amplitude — the measurement direction (radial or axial) is determined by probe mounting orientation, not the transmitter itself.
Where It Gets Deployed
Designed primarily for OEM applications on smaller rotating equipment, the 990 series is well-suited for:
- Centrifugal air compressors — continuous bearing health and rotor dynamics surveillance
- Electric motors and small pumps — early detection of imbalance, misalignment, and bearing wear
- Fans and blowers — vibration trending to prevent structural fatigue
For large turbines or heavy-duty machinery requiring phase measurement, alarm event waveform capture, or trip multiply functions, a dedicated machinery protection system such as the Bently Nevada 3500 series is the appropriate choice.
Models like 990-05-70-01-CN, 990-10-50-01-01, and 990-04-07-01-05 represent the range of configurations available, from standard builds to MOD variants such as 990-08-xx-01-00 MOD 283278-01.
991 Series: Axial Position and Thrust Monitoring
The 991 series tracks shaft axial position — measuring how far a shaft has displaced along its rotational axis and feeding that data as a real-time 4–20 mA signal into protection and trip systems. Thrust bearing condition is inferred from changes in this axial position over time, providing early warning before displacement reaches damaging thresholds.
What It Protects Against
- Thrust bearing overload on turbines and compressors, where axial displacement changes indicate developing thrust loading before rapid mechanical damage occurs
- Shaft axial drift, feeding real-time position data into protection trip systems
- Bearing replacement scheduling, using historical axial position data to time maintenance accurately
Available configurations include 991-25-70-01-00, 991-06-70-02-00, and 991-25-70-03-05, alongside MOD variants like 991-01-xx-01-00 MOD 288865-01.
Sourcing Discontinued 990 and 991 Parts Without Disruption
Many models across both series have been discontinued, yet they remain installed across industrial facilities worldwide. Replacing an entire monitoring system is rarely practical — the downtime, cost, and revalidation effort are too high.
Amikon maintains inventory across both active and discontinued part numbers, enabling like-for-like replacements that preserve existing system architecture and avoid costly requalification.
3 FAQs About Bently Nevada 990 and 991 Transmitters
Q1: Can the 990 and 991 transmitters integrate with existing DCS or PLC systems?
Yes, both series output standard 4–20 mA signals for direct integration with DCS, PLC, and machinery protection platforms. When connected to a PLC, output is limited to peak-to-peak amplitude trending; phase measurement and alarm event capture require a dedicated protection system.
Q2: What is the difference between the 990 and 991 series?
The 990 series measures peak-to-peak vibration amplitude; the 991 series measures shaft axial position, from which thrust bearing condition is inferred. Both are commonly deployed together for complete rotating machinery protection.
Q3: Do MOD variants function differently from standard models?
Yes. MOD variants carry factory-applied modifications affecting output range, cable configuration, or mounting. Always match the full part number, including the MOD suffix, to maintain system compatibility.
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