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

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Manufacturer: Bently Nevada
Product No.: 165335-01
Country of origin:United States
Product Type: 990 Vibration Transmitter
Payment: T/T, Western Union
Weight: 430g
Shipping port: Xiamen
Warranty: 12 months

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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

Option Code Slot	Selected Option Value	Technical Detail
Model Number	990	990 Vibration Transmitter Product Family
A: Full-scale Option	-05	0-5 mils peak-to-peak (0-125 um peak-to-peak) measurement scale
B: System Length Option	-XX	Configurable system loop length (Matches probe/cable design)
C: Mounting Option	-01	35 mm DIN rail clips factory-installed
D: Agency Approval	-CN	Combined ATEX/IECEx and Chinese NEPSI hazardous area approvals
Modification Code	MOD: 165335-01	Specialized factory hardware configuration modification code

Technical Specifications

Parameter	Detail
Manufacturer	Bently Nevada (Baker Hughes)
Part Number Identification	990-05-XX-01-CN MOD: 165335-01
Product Type	Two-Wire Proximity Vibration Transmitter
Full Scale Linear Calibration	0 to 5 mils pp (0 to 125 um pp) peak-to-peak displacement
Output Loop Signaling	Proportional 4 to 20 mAdc current loop
Buffered Output Scale Factor	Nominal 7.87 V/mm (200 mV/mil) corresponding to raw probe gap voltage
Buffered Output Impedance	10 kohm nominal (Protected against continuous short circuit faults)
Supply Voltage Range	+12 Vdc to +35 Vdc loop power required at the terminal links
Transducer Core Matching	Calibrated for standard 3300 XL 8mm proximity probe and extension cable loops
Field Wiring Block Capacity	Terminal strip accepting wire cross-sections up to 1.5 mm squares (16 to 24 AWG)
Enclosure Construction Material	Polycarbonate body structure integrated with an aluminum base plate
Net Component Weight	0.43 kg (0.9 lbm)
Total Shipping Weight	1.50 kg (3.3 lbm)
Operating Temperature Bounds	-35 degC to +85 degC
Storage Temperature Bounds	-51 degC to +100 degC
Relative Humidity Index	95% maximum, non-condensing atmosphere constraints

Connections/Interfaces

Interface Element	Function Assignment
PROBE Coaxial Port	Miniature coaxial connection point receiving the incoming transducer extension cable
+ (SIG) Terminal	Positive current loop connection receiving incoming +12 to +35 Vdc loop power inputs
- (COM) Terminal	Negative current loop connection returning the regulated 4 to 20 mA measurement signal
BUF BNC Port	Front-panel isolated BNC socket providing unconditioned sensor voltage waves

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.

Key Features:

#Vibration Transmitter

How does the 990-05-XX-01-CN MOD: 165335-01 behave on the 4-20 mA loop during a 'Probe NOT OK' condition?

When the transmitter detects a hardware fault—such as a severed probe lead, a shorted extension cable, or a sensor gap that exceeds the calibrated linear range—the internal diagnostic logic overrides the vibration output. It clamps the loop current to a distinct fault state (typically below 3.6 mA), allowing the host DCS or PLC to immediately recognize a sensor fault rather than mistaking a dead channel for zero vibration.

What is the maximum allowable loop resistance for this transmitter when powered by a standard +24 Vdc supply?

The maximum loop resistance is governed by the transmitter's minimum operating voltage threshold of 12 Vdc. For a +24 Vdc supply loop, the maximum voltage drop allowed across field wiring and safety barriers is 12 V (24V - 12V). Based on a maximum loop fault current of 22 mA, the maximum allowable total loop resistance is calculated as R = V / I = 12V / 0.022A, which equals approximately 545 ohms. Exceeding this resistance will cause the transmitter output to clip prematurely at high vibration amplitudes.

Will connecting a dynamic signal analyzer to the front BNC 'BUF' port cause a drop or fluctuation in the 4-20 mA control loop?

No. The front-panel BNC buffered output port is entirely isolated from the primary 4 to 20 mA current loop circuitry. Field engineers can plug in dynamic data collectors or oscilloscopes at any time for troubleshooting without degrading signal accuracy or risking an accidental machine trip.

What is the engineering purpose of the non-interacting zero and span controls under field conditions?

Although the transmitter is factory-pre-calibrated to an AISI 4140 steel target, minor field variables such as unique target metallurgy, shaft curvature, or exceptionally long field wiring can cause small offsets. The non-interacting zero and span pots allow field technicians to trim the 4 mA baseline and 20 mA full-scale current outputs to match the precise mechanical geometry of the asset without altering the underlying linearity curve.

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12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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TECHNICAL SPECIFICATIONS

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