Compact Axial Displacement Monitoring Transmitter for Rotating Equipment Reliability
The Bently Nevada 991-06-50-02-00 991 Thrust Sensor is a precision axial displacement monitoring transmitter designed for continuous thrust position measurement on critical rotating machinery. Part of the trusted 991 Thrust Transmitter Series, this device converts the signal from a Bently Nevada 3300 NSv proximity probe into a standard 4–20 mA proportional output, allowing easy integration with PLC, DCS, SCADA, and machinery protection systems.
Designed for OEM machinery manufacturers and industrial operators, the 991-06-50-02-00 configuration provides a 0.6 mm full-scale measurement range, 5.0 m system length, and bulkhead screw mounting design. Its integrated Proximitor® Sensor eliminates the requirement for a separate signal conditioner, reducing installation complexity while delivering stable and repeatable thrust position monitoring.
This transmitter is commonly used on centrifugal compressors, small pumps, motors, fans, and other rotating equipment where accurate thrust monitoring helps prevent bearing damage, unexpected shutdowns, and costly mechanical failures.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-06-50-02-00 |
| Product Type | 991 Thrust Sensor / Thrust Transmitter |
| Measurement Function | Shaft axial displacement / thrust position |
| Full Scale Range | 0.6-0-0.6 mm (25-0-25 mils) |
| System Length | 5.0 m (16.4 ft) |
| Compatible Probe | Bently Nevada 3300 NSv Proximity Probe |
| Output Signal | 4–20 mA proportional current output |
| Power Supply | +12 to +35 VDC |
| Loop Configuration | Two-wire loop powered |
| Mounting Method | Bulkhead mounting screws |
| Signal Conditioning | Integrated Proximitor® Sensor |
| Diagnostic Output | PROX OUT and COM terminals |
| Approval Option | 00 – No additional agency approval required |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -52°C to +177°C |
| Humidity Rating | 100% condensing, non-submerged |
| Transmitter Dimensions | Approx. 73 × 50 × 100 mm |
| Transmitter Weight | Approx. 0.43 kg |
| Total System Weight | Approx. 0.82 kg typical |
Application Areas
The 991-06-50-02-00 Thrust Sensor is designed for machinery applications where continuous shaft axial position monitoring is essential.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, gas compressors |
| Petrochemical | Process pumps and rotating machinery |
| Power Generation | Turbine auxiliary systems |
| Manufacturing | Motors, blowers, industrial fans |
| Water & Utilities | Large pumping equipment |
| OEM Machinery | Compressor and pump packages |
Common applications include:
-
Thrust bearing condition monitoring
-
Axial shaft movement measurement
-
Machinery protection systems
-
Predictive maintenance programs
-
Alarm and shutdown monitoring
-
Control system feedback
Key Product Advantages
Integrated Proximitor® Sensor Technology
The 991 Series incorporates an integrated proximity signal conditioning system, allowing direct connection with compatible 3300 NSv probes without requiring an external Proximitor module. This reduces cabinet space requirements and simplifies installation.
Accurate 0.6 mm Thrust Measurement
The 06 measurement option provides a precise 0.6-0-0.6 mm axial displacement range, making it suitable for applications requiring reliable detection of small shaft movements.
Flexible 5 Meter Probe System
The 50 option identifies the 5.0 meter system length, providing installation flexibility where the sensing point and transmitter location require additional cable distance.
Bulkhead Mounting Design
The 02 mounting option uses bulkhead screws, providing a secure mechanical installation method for OEM panels, machinery enclosures, and custom mounting arrangements.
Reliable 4–20 mA Output
The industry-standard current output allows straightforward connection to industrial automation systems, providing proportional axial position data for monitoring and protection logic.
Built for Industrial Environments
The transmitter features rugged construction, sealed electronics, and high humidity resistance, supporting reliable operation in demanding industrial locations.
Technical FAQs
1. What is the Bently Nevada 991-06-50-02-00 used for?
It is used to measure shaft axial displacement and provide a continuous thrust position signal for rotating machinery monitoring systems.
2. What measurement range does this model provide?
The transmitter provides a 0.6-0-0.6 mm full-scale measurement range.
3. Which proximity probe is compatible with this transmitter?
The unit is designed to operate with the Bently Nevada 3300 NSv proximity probe and matching extension cable system.
4. What does the “50” designation mean?
The 50 option represents a 5.0 meter (16.4 ft) system length configuration.
5. What does the “02” mounting option indicate?
The 02 option specifies bulkhead screw mounting instead of DIN-rail mounting.
6. Does the transmitter require an external Proximitor?
No. The Proximitor® Sensor electronics are integrated into the transmitter assembly.
7. What output signal is provided?
The transmitter provides a proportional 4–20 mA analog output representing shaft axial position.
8. What power supply is required?
The device requires a 12–35 VDC input supply at the transmitter terminals.
9. Are diagnostic outputs available?
Yes. The transmitter provides PROX OUT and COM connections for diagnostic testing and commissioning.
10. What equipment commonly uses this model?
Typical applications include centrifugal compressors, pumps, motors, fans, and OEM rotating machinery requiring thrust position monitoring.
A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
