Description

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

This exact hardware configuration features a factory-calibrated full-scale measurement scale of 0-5 mils pp (0-125 um pp), purposefully 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: 165335-01 designates a factory-controlled engineering modification that provides precise internal component matching or targeted circuit tuning tailored to optimized machinery metrics while maintaining identical physical dimensions.

Features

• Two-wire, loop-powered configuration 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: 165335-01 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.