Product Overview

The Bently Nevada 990-05-50-02-01 is a specialized 2-wire vibration transmitter designed to provide continuous machinery protection for high-speed rotating assets. This loop-powered device serves as an all-in-one signal conditioner, eliminating the need for separate Proximitor sensors. By interfacing directly with 3300 NSv proximity probes, it converts complex eddy current signals into a standardized 4-20 mA output proportional to shaft vibration. This architecture is specifically optimized for Original Equipment Manufacturers (OEMs) and facilities that require critical vibration data to be integrated directly into a PLC, DCS, or SCADA system without the footprint of a traditional monitoring rack.

Key Technical Characteristics

The 990 series transmitter is engineered for precision and field-reliability, featuring advanced circuitry to ensure signal accuracy in electrically noisy industrial environments.

• Model Number 990-05-50-02-01

• Transducer Input Optimized for Bently Nevada 3300 NSv Proximity Probes

• System Length 5.0 Meters (16.4 feet) total configuration (Option -05)

• Full-Scale Range 0 to 125 µm (0 to 5 mils) peak-to-peak vibration (Option -50)

• Output Signal 4 to 20 mA DC (Proportional to vibration amplitude)

• Diagnostic Interface Non-isolated "PROX OUT" coaxial connector for raw dynamic signal analysis

• Power Requirements +12 to +35 Vdc (Loop-powered)

• Mounting Configuration Bulkhead screw mounting (Option -02)

• Hazardous Area Certification CSA Division 2 / ATEX Zone 2 (Option -01)

• Protection Logic Integrated "Not OK" / Signal Defeat circuit to prevent false trips during sensor fault conditions

Industrial Applications and Operational Use Cases

The 990-05-50-02-01 is a vital component for Turbine Supervisory Instrumentation (TSI) in applications where compact signal conditioning is paramount.

• Centrifugal Air Compressors Real-time monitoring of shaft vibration to detect impeller unbalance, mechanical looseness, or surging.

• Industrial Motors and Pumps Direct 4-20 mA trending for predictive maintenance on high-service pumps and medium-to-large electric motors.

• Balance of Plant (BoP) Equipment Providing cost-effective vibration monitoring for cooling tower fans and secondary blowers.

• OEM Machinery Packages Serving as a standardized, built-in vibration sensing solution for equipment manufacturers across the oil, gas, and power sectors.

• Remote Asset Monitoring Utilizing the 4-20 mA loop to transmit vibration data over long distances to central control rooms with high immunity to interference.