Bently Nevada 990-05-70-03-00 990 Vibration Transmitter

Description

The 990-05-50-02-00 is a 2-wire, loop-powered device designed to provide continuous machinery vibration monitoring directly to a distributed control system (DCS), programmable logic controller (PLC), or machinery protection architecture. It conditions signals from proximity probes to output a proportional 4-20 mA current loop, representing total radial vibration or axial thrust measurement.

This transmitter interfaces directly with a non-contacting eddy current probe system to log dynamic shaft displacement. The hardware conversion architecture extracts the peak-to-peak or static position trends without requiring an intermediate machinery monitoring rack, making it suitable for standard control loops. It maintains full system compatibility with specific proximity probe sub-assemblies and calibrated cable lengths to ensure accurate scale-factor linear output.

Features

• Standard 4-20 mA current loop output proportional to machinery vibration
• Direct interface capability with 3300 NSv proximity probe systems
• Integrated signal conditioning inside a compact, field-mountable enclosure
• Bulkhead screw mounting hardware for rigid installation on machine housings
• Wide input voltage range to accommodate varying loop load requirements

Applications

• Radial vibration monitoring on small centrifugal pumps and compressors
• Axial shaft displacement measurements on industrial fans and blowers
• Electric motor and generator bearing housing vibration tracking
• Auxiliary rotating machinery protection loops in petrochemical facilities
• Balance-of-plant equipment integration into factory control architectures

Ordering Information

Technical Specifications

Installation Guidelines

• Mounting Configuration: Mount the transmitter base securely onto a flat bulkhead surface using the pre-selected bulkhead screw hardware option. Ensure the surface is free of high vibration spikes that could fatigue the internal board electronics.
• Probe Gap Adjustment: Ensure the 3300 NSv proximity probe is mechanically adjusted to its physical mid-range voltage point before finalizing the locknut installation. This adjustment keeps the transducer within its accurate linear operating zone.
• Cable Routing and Shielding: Route the 5.0-meter extension cable through dedicated conduit paths separate from high-voltage motor lines. Bond the overall cable shield firmly to the designated instrumentation ground point at the receiver chassis to mitigate electromagnetic field noise.
• Power Connection: Verify that the loop power supply source provides clean, regulated direct current within the +12 to +35 Vdc operating range prior to terminating the wires at the input blocks.

FAQ

What specific sensor input does this unit support?

The transmitter accepts exactly one non-contacting 3300 NSv proximity probe along with its matching extension cable configured for a total system length of 5.0 meters.

Does this configuration carry hazardous area certifications?

This specific unit option code includes the 00 modification block, meaning agency approval is not required or provided for this specific product variant.

How is the device powered during operation?

The transmitter functions as a standard loop-powered module, requiring an external loop supply voltage between +12 and +35 Vdc connected directly across its terminal interface.