Description
Application Scenarios
In an industrial facility operating a centrifugal air compressor, engineers noticed a gradual change in thrust bearing behavior during routine operations. The maintenance team installed the Bently Nevada 991-10-XX-02-00 with a compatible 3300 NSv proximity probe to provide continuous shaft axial-position feedback. The transmitter delivered a stable 4–20 mA signal to the plant’s control system, allowing operators to track thrust trends without adding a larger centralized monitoring rack.
The real value became clear during commissioning, when the team used the transmitter’s diagnostics to verify probe gap and signal integrity before returning the compressor to service. By detecting subtle changes in axial position early, the 163930-01 helped the plant reduce unplanned downtime, improve maintenance planning, and protect critical rotating assets.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 991-10-XX-02-00 |
| Part Number | 163930-01 |
| Manufacturer | Bently Nevada |
| Product Category | Thrust transmitter / axial position transmitter |
| Measurement Object | Shaft axial displacement (thrust position) |
| Input Type | 1 × 3300 NSv proximity probe with matching extension cable |
| Output Signal | 4–20 mA DC, proportional to axial position |
| Power Supply | +12 to +35 V DC loop-powered input |
| Full-Scale Range | 0.6–0–0.6 mm (25–0–25 mils) |
| Total Thrust Movement | Up to 1.2 mm (50 mils) |
| Loop Accuracy | Within ±1.5% of full-scale range |
| System Length | Configured for compatible probe and extension cable system |
| Mounting Method | 35 mm DIN-rail clips (per model suffix) |
| Diagnostic Output | PROX OUT, COM terminals, and coaxial connector |
| Operating Temperature | –35 °C to +85 °C |
| Environmental Protection | Potted construction for high-humidity environments |
| Notifications/Signal Defeat | Output drops below 3.6 mA in a Not OK condition |
Technical Principles and Innovative Values
- Innovation Point 1: Integrated Proximitor electronics. The Bently Nevada 991-10-XX-02-00 integrates Proximitor signal conditioning, removing the need for a separate external Proximitor unit and simplifying the measurement loop.
- Innovation Point 2: Direct 4–20 mA control system interface. The transmitter converts axial shaft position into an industry-standard analog signal that can be read directly by a PLC, DCS, or machinery protection system.
- Innovation Point 3: Continuous thrust trending. The 163930-01 supports long-term axial position monitoring, helping maintenance teams detect gradual changes that may indicate thrust-bearing wear or abnormal rotor behavior.
- Innovation Point 4: Built-in diagnostics. Non-isolated PROX OUT and COM terminals, together with a coaxial connector, provide dynamic vibration and gap-voltage signals for troubleshooting and condition analysis.
- Innovation Point 5: Non-interacting calibration controls. Zero and span adjustments allow technicians to configure the output loop without one control adversely affecting the other, streamlining commissioning.
- Innovation Point 6: Signal integrity protection. The Not OK/Signal Defeat circuit prevents false high readings caused by a faulty probe or loose connection, while the power-up inhibit circuit reduces errors during startup transients.
- Innovation Point 7: Rugged, compact installation. With potted construction and DIN-rail mounting, the 991-10-XX-02-00 is designed for demanding industrial conditions and space-limited panels.
