Description

The Bently Nevada 990-10-XX-01-05 (including MOD:285269-01) is a 2-wire, loop-powered industrial vibration transmitter. It interfaces directly with a 3300 NSv proximity probe and its matching extension cable to provide non-contacting machinery protection. The transmitter conditions the eddy current sensor signals and outputs a proportional 4 to 20 mA analog current loop representing peak-to-peak vibration amplitude. This standalone design integrates an internal Proximitor sensor, allowing a direct connection to a distributed control system (DCS), programmable logic controller (PLC), or machinery control network without a separate monitoring rack. 

Features

• Integrated Proximitor sensor eliminates the need for external processing units
• Proportional 4 to 20 mA loop-powered output for straightforward control system integration
• Non-isolated PROX OUT and COM coaxial terminals for dynamic vibration and gap voltage diagnostics
• Non-interacting zero and span potentiometers for simple calibration adjustments
• Test input pin for system verification using external function generators
• Fully potted construction protecting interior circuits against harsh, high-humidity environments 

Applications

• Radial vibration monitoring on small centrifugal air compressors
• Machinery protection for industrial motors and cooling tower fan systems
• Predictive maintenance for small pumps and process gas equipment
• Non-contacting shaft displacement analysis in tight installation clearances 

Technical Specifications

Connections / Interfaces

Installation Guidelines

• Mount the transmitter securely onto a standard DIN rail or a flat bulkhead plate inside an appropriate environmental enclosure.
• Ensure the coaxial connections between the transmitter, extension cable, and 3300 NSv probe are clean, dry, and locked into place.
• Route the high-level 4 to 20 mA current loop wiring away from high-voltage motor power leads to avoid electromagnetic interference.
• Avoid exposing the terminal connections directly to continuous water spray or standing moisture; house the hardware in an IP54 or better enclosure if necessary.
• Use the non-interacting zero and span potentiometers carefully when running field loop performance trims. 

Compliance and Certifications

• CE 

FAQ

What is the core function of the Bently Nevada 990-10-XX-01-05?

It functions as a loop-powered transmitter that processes proximity probe signals into a standard 4 to 20 mA output for a PLC or DCS. 

Does this device require a separate Proximitor sensor?

No, it has an integrated Proximitor sensor, eliminating the need for external processing hardware.

Which proximity probes are electrically compatible with this unit?

It is designed exclusively to interface with Bently Nevada 3300 NSv proximity probes and matching extension cables. 

What does the XX signify in the part number?

The XX denotes specific unlisted sub-options within the ordering guide, such as specific full-scale range calibrations.

How can field engineers access dynamic vibration waveforms for diagnostic analysis?

Dynamic signals can be checked directly across the PROX OUT and COM coaxial terminals using a portable vibration analyzer or oscilloscope.

What type of machinery is this transmitter optimized for?

It is primarily intended for industrial OEMs of centrifugal air compressors, small pumps, fans, and electric motors. 

Is this transmitter a loop-powered or a 4-wire device?

It is a 2-wire, loop-powered device that receives power and transmits data over the same current loop. 

What engineering units are represented by the 4 to 20 mA signal?

The current signal represents the peak-to-peak vibration amplitude of the target machine shaft.

What are the physical dimensions of the chassis?

The transmitter body measures approximately 7.3 cm x 6 cm x 10 cm. 

Can I verify the loop output without moving the machine shaft?

Yes, you can use the designated Test Input pin with an external function generator to simulate input signals and verify loop response.