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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Bently Nevada 991-01-XX-01-01 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Product Type | Integrated Proximitor Sensor / Vibration Transmitter |
| Series | 991 Thrust Transmitter |
| Compatible Probe | 3300 XL NSv Proximity Probe |
| System Length Options | 5.0 m or 7.0 m |
| Output Signal | 4-20 mA (two-wire, loop-powered) |
| Prox Out Signal | Dynamic vibration and gap voltage |
| Power Supply | +12 to +35 Vdc |
| Loop Accuracy | ±1.5% of full scale (typical) |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -51°C to +100°C |
| Mounting Type | 35 mm DIN-rail clips or bulkhead screws |
| Protection Rating | Potted construction, resistant to 100% condensation |
| Agency Approvals | CSA Division 2, ATEX Zone 2 (per configuration) |
| Weight | 0.43 kg (0.9 lbm) |
Main Features and Advantages
The Bently Nevada 991-01-XX-01-01 distinguishes itself through an integrated architecture that consolidates Proximitor signal conditioning and transmitter functions into a single compact module. This design eliminates the external前置器 unit traditionally required between the proximity probe and the control system, reducing wiring complexity, installation time, and potential sources of signal degradation. For OEMs and system integrators, the Bently Nevada 991-01-XX-01-01 offers a streamlined solution that simplifies panel layout and lowers total installed cost without sacrificing measurement performance.
Dual Output Architecture for Enhanced Diagnostics: The Bently Nevada 991-01-XX-01-01 provides both a 4-20 mA loop output and a Prox Out coaxial interface. The 4-20 mA signal delivers the conditioned vibration or axial position value directly to control and protection systems, while the Prox Out terminal enables engineers to connect diagnostic instruments for access to the raw dynamic waveform. This dual-output capability supports both routine monitoring and in-depth fault analysis, allowing maintenance teams to identify issues such as imbalance, misalignment, and bearing wear without additional signal conditioning equipment.
Robust Environmental Protection: The Bently Nevada 991-01-XX-01-01 features a fully potted construction that withstands high-humidity environments, including conditions with up to 100% condensation. Its operating temperature range of -35°C to +85°C ensures reliable performance across diverse industrial settings, from cold outdoor installations to hot process areas. The rugged design protects sensitive signal conditioning circuitry from moisture, contaminants, and mechanical vibration, extending service life and reducing maintenance requirements.
Fail-Safe Signal Integrity: The Bently Nevada 991-01-XX-01-01 incorporates Not OK/Signal Defeat circuitry that suppresses erroneous outputs when probe faults, cable disconnections, or power supply anomalies are detected. When a fault condition occurs, the 4-20 mA output drops below 3.6 mA within 100 microseconds, alerting the control system to a measurement failure rather than allowing a false high reading that could trigger inappropriate protective action. This fail-safe behavior is critical in machinery protection applications where incorrect signals could cause unnecessary shutdowns or, conversely, fail to trigger needed alarms.
Simplified Calibration and Loop Verification: Non-interacting zero and span potentiometers located under the transmitter label allow technicians to adjust the 4-20 mA output calibration without disconnecting the loop or accessing internal components. A Test Input pin further simplifies commissioning by enabling loop verification without physically simulating probe signals, reducing setup time during installation and periodic maintenance.
