Description

Bently Nevada 990-10-XX-01-05 MOD:285269-01 | 2-Wire Vibration Transmitter

The Bently Nevada 990-10-XX-01-05 (including MOD:285269-01) is a specialized 2-wire vibration transmitter designed to provide continuous machinery protection for centrifugal air compressors and other rotating assets. This device integrates a Proximitor sensor and signal conditioning circuitry into a single compact package. It converts the complex signal from a proximity probe into a standard 4 to 20 mA analog output. By providing a signal proportional to the overall vibration, this transmitter allows operators to interface high-precision eddy current measurements directly with a PLC, DCS, or SCADA system without requiring a separate monitor rack.

Simplified Architecture for Direct Interface

This transmitter simplifies the monitoring chain by eliminating the need for intermediate racks in less critical applications. It primarily measures radial vibration or axial thrust on machinery with fluid-film bearings. The 990 series is specifically calibrated for use with the Bently Nevada 3300 XL 8 mm proximity probe and extension cable. This combination ensures high-accuracy data transmission over standard industrial wiring, which reduces installation costs while maintaining the rigorous standards of the 3300 XL transducer family.

Technical Specifications

The 990-10-XX-01-05 MOD:285269-01 is engineered for precision in harsh industrial environments.

• Manufacturer: Bently Nevada (Baker Hughes)
• Base Model: 990-10-XX-01-05
• Modification: MOD:285269-01 / MOD:165353-01
• Input Type: 2-wire, 4 to 20 mA loop-powered
• Measurement Range: 0 to 125 µm (0 to 5 mils) or 0 to 250 µm (0 to 10 mils)
• Standard Scale Factor: 7.87 V/mm (200 mV/mil)
• System Total Length: 5.0 meters (Standard)
• Mounting Options: 35mm DIN rail or bulkhead mounting
• Dimensions: 7.4 cm x 5.5 cm x 9.8 cm
• Weight: 0.46 kg

Advanced Signal Processing and Diagnostics

Despite its simplified 2-wire design, the 990 transmitter includes sophisticated internal diagnostics. It monitors the health of the proximity probe and cable, shifting the output current to a “Not OK” level (typically below 3.6 mA) if a fault occurs. This prevents false alarms and ensures maintenance teams can quickly identify hardware issues. Furthermore, the unit features a buffered output connector, which allows vibration technicians to connect portable analyzers for detailed waveform analysis and spectrum diagnostics without interrupting the 4 to 20 mA loop.

Durability and Industrial Resilience

Constructed for long-term deployment in demanding sectors such as power generation and water treatment, the transmitter features a robust housing that resists chemical exposure. The electronics are encapsulated to protect against moisture and high-vibration conditions. Because it utilizes a 2-wire loop-powered configuration, the device minimizes the impact of electrical noise and simplifies field wiring. This reliability ensures that critical machinery remains under constant surveillance, enabling predictive maintenance strategies that prevent unplanned outages and extend asset life.