Product Overview

The Bently Nevada 990-05-50-01-01 is a high-performance, loop-powered vibration transmitter designed 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 systems that require a separate Proximitor sensor and monitoring rack, the 990-05-50-01-01 combines these functions into a single, compact housing. It is specifically engineered for Original Equipment Manufacturers (OEMs) and facilities that require reliable vibration trending directly integrated into a PLC, DCS, or SCADA system.

Hardware Parameters and Key Characteristics

This transmitter is built to operate within a two-wire current loop, combining precision signal conditioning with a ruggedized form factor suitable for high-density industrial installations.

• Model Number 990-05-50-01-01

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

• System Length Compatibility Optimized for 5.0-meter (16.4 ft) system lengths (Option -05)

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

• Mounting Configuration 35mm DIN-rail clips (Option -01)

• Agency Approvals CSA Division 2 / ATEX Zone 2 hazardous area certifications (Option -01)

• Frequency Response 5 Hz to 5 kHz (± 3 dB)

• Diagnostic Interface Non-isolated "Prox Out" coaxial connector for dynamic signal access

• Safety Features Integrated "Not OK" / Signal Defeat circuit to prevent false trips

• Adjustment Non-interacting zero and span potentiometers for field calibration

• Weight 0.54 kg (approx. 1.19 lbs)

Industrial Applications and Operational Use Cases

The 990-05-50-01-01 is a vital component for Turbine Supervisory Instrumentation (TSI) in applications where compact footprints and simplified signal paths are required.

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

• Industrial Pumps and Motors Providing a direct analog interface for plant control systems to trigger automated alarms or machinery trip logic.

• Cooling Tower Fans Monitoring gearbox and fan shaft vibration levels in remote locations without the need for complex monitoring racks.

• OEM Machine Protection Integrated as a standard vibration sensing solution for equipment manufacturers to provide basic asset health trending.

• Hazardous Environment Monitoring Certified for use in Class I, Division 2 areas, making it suitable for oil, gas, and chemical processing facilities.