Product Overview

The Bently Nevada 990-05-50-02-00 is a high-performance, loop-powered vibration transmitter engineered to provide continuous machinery protection for high-speed rotating assets. This integrated signal conditioner interfaces directly with a 3300 NSv proximity probe, converting eddy current displacement signals into a standardized 4-20mA analog output. Unlike traditional monitoring systems that require a separate Proximitor sensor and centralized rack, the 990-05-50-02-00 combines these functions into a single, field-mountable housing. It is specifically designed for Original Equipment Manufacturers (OEMs) and industrial facilities that require reliable vibration trending integrated directly into a PLC, DCS, or SCADA control system.

Key Technical Characteristics

The 990 series transmitter is built to sustain performance in demanding industrial environments while maintaining the strict signal integrity required for critical asset monitoring.

• Model Number 990-05-50-02-00

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

• Transducer Compatibility Specifically calibrated for Bently Nevada 3300 NSv Proximity Probes

• System Length Optimized for a 5.0-meter (16.4 ft) total system configuration (Option -05)

• Output Signal 4 to 20 mA DC, proportional to peak-to-peak vibration amplitude

• Excitation Voltage +12 to +35 Vdc (Loop-powered)

• Mounting Configuration Bulkhead screw mounting for secure panel or bracket installation (Option -02)

• Agency Approvals Standard / Non-hazardous area version (Option -00)

• Maximum Loop Resistance 1,000 Ω at 35 Vdc

• Safety Features Integrated current limiting at 23mA and "Not OK" signal logic to prevent false data during sensor failure

Operational Use Cases and Industrial Applications

As a primary sensor interface for Turbine Supervisory Instrumentation (TSI), the 990-05-50-02-00 provides cost-effective surveillance for various rotating equipment.

• Centrifugal Air Compressors Real-time monitoring of radial shaft vibration to detect rotor unbalance, mechanical looseness, or bearing degradation.

• Industrial Pumps and Motors Providing a direct 4-20mA interface for plant control systems to trigger automated alarms or machinery trip logic based on vibration severity.

• Cooling Tower Fans Monitoring gearbox and fan shaft vibration levels in remote or hard-to-reach locations without the need for complex rack-based infrastructure.

• Small Steam and Gas Turbines Tracking shaft motion during critical startup and operational phases to ensure mechanical clearances are maintained.

• OEM Machinery Packages Integrated as a standard vibration sensing solution for equipment manufacturers across the oil, gas, and power generation sectors.