Product Overview

The Bently Nevada 990-04-50-01-CN is a loop-powered, 2-wire vibration transmitter designed to provide continuous machinery protection. It functions as an integrated signal conditioner, combining the capabilities of a Proximitor sensor with a transmitter that converts eddy current signals into a standardized 4 to 20 mA analog output. This unit is specifically calibrated for the 3300 NSv proximity transducer system, which is optimized for tight installation clearances. By delivering a signal proportional to peak-to-peak vibration, the 990-04-50-01-CN allows for direct integration into PLCs or DCS environments without the need for a dedicated monitoring rack.

Key Technical Characteristics

This transmitter is engineered for precision signal conversion and field-level diagnostics in industrial settings.

• Model Number 990-04-50-01-CN

• Transducer Interface Specifically for 3300 NSv Proximity Probes

• System Length 5.0 Meters (Option -04)

• Measurement Range 0 to 125 µm (5.0 mils) peak-to-peak (Option -50)

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

• Diagnostic Port Coaxial BNC and screw terminals for raw gap and dynamic signal analysis

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

• Logic Protection Integrated Not OK/Signal Defeat circuit to suppress false trips from wiring or probe failure

• Calibration Support Non-interacting zero and span potentiometers for loop tuning

• China Certification CN suffix indicates compliance with specific regional standards/approvals

Industrial Applications

The 990-04-50-01-CN is predominantly utilized as a cost-effective monitoring solution for Original Equipment Manufacturers (OEMs). Its primary use cases include:

• Centrifugal Air Compressors Monitoring high-speed shaft vibration where narrow side-view (NSv) probes are required due to space constraints.

• Industrial Fans and Motors Providing continuous health data to prevent unbalance-related failures.

• Small Pumps Enabling automated alarm and shutdown logic via 4-20mA loop signals.

• TSI Integration Acting as a primary data source for Turbine Supervisory Instrumentation where a full 3500 rack is not feasible.

The inclusion of a buffered diagnostic output allows maintenance personnel to perform frequency spectrum analysis using portable data collectors without interrupting the primary protection loop.