990-05-XX-01-CN MOD: 165335-10 | Bently Nevada | 990 Vibration Transmitter

Description

The 990-05-XX-01-CN MOD: 165335-10 is a loop-powered, two-wire 990 Vibration Transmitter engineered by Bently Nevada (a Baker Hughes business) to provide continuous machinery protection by interfacing directly with industrial control networks. This field-mountable device combines the signal conditioning electronics of a proximity sensor and a transmitter into a single, compact housing. It accepts input signals from a non-contacting 3300 XL 8mm eddy-current proximity probe and extension cable, processing raw high-frequency micro-gap changes into a linear 4 to 20 mA analog current loop. This continuous current loop can be routed straight to standard Distributed Control Systems (DCS), Programmable Logic Controllers (PLC), or process data recorders without the added complexity of a separate, rack-based machinery protection monitor.

This specific configuration features a factory-calibrated full-scale measurement scale of 0-5 mils pp (0-125 um pp), optimized for tracking radial shaft vibration amplitudes on rotating machinery. The transmitter body is equipped with standard 35 mm DIN rail clips for rapid, secure snap-on mounting into field marshalling enclosures or local junction boxes. Certified with the CN agency approval option, this hardware meets stringent international and regional safety frameworks, including ATEX/IECEx and Chinese NEPSI hazardous area standards for classified zones. The specialized suffix MOD: 165335-10 designates a factory-controlled engineering modification that provides precise hardware component matching or specific internal filter tuning tailored to optimized machinery metrics while maintaining identical physical dimensions.

Features

• Two-wire, loop-powered design that routes a proportional 4 to 20 mA analog signal directly to host DCS or PLC automation cards.
• Standardized 0-5 mils peak-to-peak (0-125 um peak-to-peak) linear scale calibration for high-accuracy shaft displacement metrics.
• Integrated heavy-duty 35 mm DIN rail mounting clips for toolless, secure installation on standard terminal enclosure tracks.
• Dual hazardous zone certifications combining global ATEX/IECEx standards with local Chinese NEPSI industrial safety markings.
• Factory modification code MOD: 165335-10 for specialized circuit optimization and application-specific operational stability.
• Front-mounted, isolated BNC dynamic terminal providing raw, unconditioned voltage waveforms for local diagnostic data collectors.
• Non-interacting zero and span adjustment pots allowing seamless, independent calibration verification under field conditions.

Applications

• Standalone radial shaft vibration monitoring on fluid-filmed bearings of industrial centrifugal air compressors and turbo-fans.
• Direct asset protection loop integration for medium-sized balance-of-plant electric motors and high-speed centrifugal pumps.
• Distributed machinery condition monitoring inside remote oil and gas transport pipeline stations or utility water pumps.

Option String Breakdown

Technical Specifications

Connections/Interfaces

Installation Guidelines

• DIN Rail Attachment: Position the transmitter housing directly over standard 35 mm DIN rail tracking. Apply firm downward pressure until the integrated plastic clips snap tightly over the rail flanges.
• Chassis Frame Isolation: Ensure the internal ground planes remain isolated from bare electrical conduit paths. The transmitter backplate must remain isolated from structural rack frames to eliminate low-voltage ground loops.
• System Length Verification: Verify that the system length option (Option -XX) perfectly matches the combined physical length of the connected 3300 XL 8mm probe and extension cable to maintain proper scaling.
• Dynamic Signal Diagnostic Check: Use the front-facing coaxial BNC connector to patch into local signal analyzers. This buffered port provides a raw voltage wave (200 mV/mil) without altering the primary 4-20 mA control loop tracking.