Bently Nevada 990-05-70-01-00 990 2-Wire Vibration Transmitter

Description

The Bently Nevada 990-05-70-01-00 is a compact vibration transmitter designed for continuous monitoring of rotating machinery in industrial process systems. It converts shaft vibration signals from a compatible 3300 NSv proximity probe into a standard 4 to 20 mA output suitable for direct connection to PLC, DCS, and machine protection platforms.

This configuration uses a 7.0 metre transducer system and supports installations where extended probe cable routing is required between the machine casing and control cabinet. The integrated signal conditioning electronics simplify field installation by eliminating the need for a separate external proximitor assembly.

The transmitter housing is fully potted to improve reliability in humid environments commonly found around compressors, pumps, and auxiliary process equipment. A dedicated PROX OUT connection is also available for temporary vibration analysis and diagnostic measurements during maintenance activities.

Factory calibration adjustments are accessible beneath the transmitter label, allowing field technicians to fine-tune loop output without disassembling the enclosure.

Key Functions

• Continuous shaft vibration monitoring
• 4 to 20 mA proportional signal transmission
• Integrated Proximitor sensor electronics
• Dynamic signal access through PROX OUT
• Loop-powered two-wire operation
• Probe fault detection and signal defeat logic
• External zero and span calibration
• DIN rail mounting support
• Compact form factor for OEM panels
• Moisture-resistant encapsulated construction

Typical Installations

Ordering Information

Product Details

Interface Information

Installation Notes

Install the transmitter on a properly grounded DIN rail inside a protected control enclosure. Maintain separation between transducer wiring and high-voltage power cables to reduce electrical interference.

Probe target gap should be verified before startup to ensure proper linear response. When using portable analyzers or oscilloscopes for diagnostics, isolated test equipment is recommended for the PROX OUT connection.

The encapsulated housing supports high-humidity operation, but exposed connectors should still be protected from standing moisture and direct washdown conditions.

Avoid excessive thread engagement during probe installation. Over-tightening may cause mechanical binding inside threaded mounting locations.

FAQ

What does the transmitter measure?
It measures shaft vibration from a compatible proximity probe system and converts the signal into a 4 to 20 mA output.

Which probe system is required?
The transmitter is designed for Bently Nevada 3300 NSv probe assemblies.

Does this version include hazardous area approvals?
No. The -00 approval option indicates standard non-hazardous configuration.

What mounting hardware is included?
This model includes 35 mm DIN rail clips.

Can the unit connect directly to a PLC?
Yes. The analog output is intended for PLC and DCS analog input channels.

Is the transmitter loop powered?
Yes. It operates from a two-wire loop-powered circuit.

What is the supported cable system length?
This version uses a 7.0 metre transducer system.

Can technicians access raw vibration signals?
Yes. The PROX OUT connection provides dynamic signal access for diagnostics.

What happens during a probe failure?
The output drops below 3.6 mA to indicate a NOT OK condition.

Is field calibration supported?
Yes. Zero and span adjustments are accessible externally.

What environments is the housing designed for?
The potted construction supports high-humidity industrial environments.

Can the transmitter perform vibration phase analysis?
No. The 4 to 20 mA output is intended for overall vibration trending only.