Brand: Bently Nevada

Bently Nevada 990-05-50-01-00 2-Wire Vibration Transmitter

Name: Bently Nevada 990-05-50-01-00 Vibration Transmitter – Datasheet
Brand: Bently Nevada

Description

Overview

The Bently Nevada 990-05-50-01-00 is a 990 Vibration Transmitter, a 2-wire, loop-powered device intended mainly for OEMs of centrifugal air compressors and small pumps, motors or fans that want a simple 4 to 20 mA vibration signal as the input to their machine control system. It accepts a 3300 NSv proximity probe and matching extension cable (ordered separately), conditions the signal into peak-to-peak vibration amplitude and outputs it as a proportional 4 to 20 mA signal.

In the 990-AA-BB-CC-DD order code, this unit is configured for a 0-5 mils pp (0-125 µm pp) full-scale range, a 5.0 m system length, 35 mm DIN-rail clip mounting and no agency approval. A transmitter provides overall vibration trending and alarming but not the diagnostic functions of a continuous monitoring system.

Key Features

Integrated Proximitor Sensor; no external signal conditioner required
Non-isolated PROX OUT terminals and coaxial connector for dynamic and gap signal diagnostics
Non-interacting zero and span adjustments and a Test Input pin
Not OK / signal defeat and power-up inhibit circuits
Potted construction for up to 100% condensing humidity

Technical Specifications

Parameter	Value
Part number	990-05-50-01-00
Full-scale option	05: 0-5 mils pp (0-125 µm pp)
System length option	50: 5.0 m
Mounting option	01: 35 mm DIN-rail clips
Agency approval option	00: not required
Input	One 3300 NSv proximity probe and extension cable
Power	+12 to +35 Vdc at transmitter terminals
Output	4 to 20 mA over full-scale range, 2-wire loop
Loop accuracy	±1.5% over full-scale range
Max. loop resistance	1,000 Ω including cable at 35 Vdc
Current limiting	23 mA typical
Not OK / signal defeat	Output <3.6 mA within 100 µs of Not OK
Probe gap	0.5 to 1.75 mm (20 to 55 mils) for full-scale range
Prox Out linear range	1.4 mm (55 mils), from approx. 0.25 mm
Prox Out scale factor	7.87 mV/µm (200 mV/mil) ±6.5% typical
Frequency response	5 Hz to 6,000 Hz, +0/-3 dB
Minimum target	9.5 mm diameter
Transmitter operating temperature	-35 °C to +85 °C
Transmitter weight	0.43 kg
Transmitter storage temperature	-52 to +100 °C
Power-up inhibit	Output held below 3.6 mA for 2 to 3 s after power is applied
Recovery after Not OK	Output restored 2 to 3 s after the fault clears
Prox Out output impedance	10 kΩ, calibrated for a 10 MΩ load
Scale factor temperature stability	Within ±10 % of 7.87 mV/µm from 0 to +70 °C
Maximum Prox Out (BNC) lead length	3 m
Maximum loop cable length	13 km with 1.0 mm² (18 AWG) shielded twisted pair
Maximum loop resistance versus supply	43.5 × (supply voltage – 12) Ω
Probe temperature range	-52 to +177 °C operating and storage
Probe-to-lead tensile strength	222 N maximum
Total system weight	0.82 kg typical

Applications

Radial vibration trending and alarming on packaged centrifugal air compressors
Small pumps, motors, fans and blowers on skids where a PLC or DCS reads a 4 to 20 mA vibration value
Balance-of-plant rotating equipment in water, power and oil & gas facilities

Bently Nevada 990-05-50-01-00 Installation and Wiring Notes

The loop is wired with two conductors; the manufacturer recommends shielded twisted pair of 1.0 mm² (18 AWG) and allows up to 13 km between transmitter and receiver. The transmitter needs at least 12 Vdc at its own terminals, so the usable loop resistance depends on the supply: the datasheet gives 43.5 × (supply voltage – 12) ohms, which reaches 1,000 ohms at 35 Vdc. If this limit is exceeded the output cannot reach 20 mA at full scale.

After power-up the output stays below 3.6 mA for two to three seconds, and the same delay applies when a probe fault clears. Control-system logic should allow for this so that the start-up state is not read as a fault or as zero vibration.

The PROX OUT signal is not isolated from the loop and its phase is inverted compared with a standard Bently Nevada Proximitor. Battery-powered or isolated instruments can be connected directly, with a lead no longer than 3 m. Grounded mains-powered analysers can cause a false alarm and should be connected through the 990/991 Test Adapter 122115-01.

Bently Nevada 990-05-50-01-00 Ordering Code and Options

In 990-AA-BB-CC-DD, AA is the full-scale range of the 4 to 20 mA output: 04, 05, 08 or 10 for 0-4, 0-5, 0-8 or 0-10 mils peak-to-peak (100, 125, 200 or 250 µm). BB is the system length the transmitter is matched to, 50 for 5.0 m or 70 for 7.0 m of probe plus extension cable. CC is the mounting: 01 for 35 mm DIN-rail clips, 02 for bulkhead screws, 03 for both. DD is the agency approval: 00 none, 01 CSA Division 2, and 05 CSA Division 2 with ATEX Zone 0 and Zone 2 plus ABS maritime approval.

This part is therefore a 0-5 mil, 5.0 m, DIN-rail unit without hazardous-area approval. For a 5.0 m system the listed 3300 NSv extension cables are 330930-040 (4.0 m) and 330930-045 (4.5 m).

Why Seven Star LLC

Seven Star LLC supplies Bently Nevada (Baker Hughes) 990 series vibration transmitters to power, oil & gas, petrochemical and water customers across Oman and the GCC. Before quoting, we check the complete part number and the full-scale range, system length and mounting option against the equipment already installed, so the replacement matches the existing system.

Request a Quote for Bently Nevada 990-05-50-01-00 2-Wire Vibration Transmitter

Submit a formal inquiry through our RFQ page with the transmitter part number 990-05-50-01-00, the quantity, the required full-scale range and system length, and the installed 3300 NSv probe part number. We will confirm the correct configuration and respond with a formal quotation. | Inquiry Form

Other Models in the Bently Nevada 990 Vibration Transmitters Range

Seven Star LLC supplies models from the Bently Nevada 990 Vibration Transmitters range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.

Model	Category
Bently Nevada 990-05-XX-03-05 2-Wire Vibration Transmitter	Vibration Monitoring	View details
Bently Nevada 990-04-70-01-00 2-Wire Vibration Transmitter	Vibration Monitoring	View details
Bently Nevada 990-05-50-01-00 2-Wire Vibration Transmitter	Vibration Monitoring	You are viewing this model
Bently Nevada 990-05-70-02-00 2-Wire Vibration Transmitter	Vibration Monitoring	View details

Datasheets & Documents

Datasheet Bently Nevada 990-05-50-01-00 2-Wire Vibration Transmitter Datasheet Download

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About brand

Since 1961 Bently Nevada, of Minden, Nevada, USA, has been closely tied to two things: the eddy current proximity probe and the rack-based machinery protection system. The 3500 rack is found on turbines and compressors in most large process plants.

Seven Star LLC is an independent supplier of Bently Nevada 3500 monitor modules, interface and communication modules, proximity probes, accelerometers and velocity transducers for operators in Oman and the GCC, with every item matched to the full part number.

Bently Nevada 3500 modules and transducers

The listed 3500 modules include the 3500/20 Rack Interface Module, the 3500/50M Tachometer, the 3500/61 Temperature and 3500/62 Process Variable monitors, the 3500/64M Dynamic Pressure monitor, the 3500/44M for aeroderivative gas turbines and the 3500/46M Hydro monitor. Reciprocating compressor monitoring is covered by the 3500/70M, 3500/72M and 3500/77M. The 3500/92 Communication Gateway and 3500/94M display link the rack to the control system. Transducers include the 3300 XL proximity probe system, the 330400 accelerometer and the 190501 Velomitor CT velocity transducer. The manufacturer's newer platform, Orbit 60, is offered as the modernization path for 3500 racks, and System 1 software handles diagnostics.

Where Bently Nevada vibration monitoring is used

Steam and gas turbines, generators, centrifugal and reciprocating compressors, large pumps, hydro units and cooling tower fans in oil and gas, power generation, petrochemical and mining plants are the usual machines. Measurements include radial vibration, thrust position, speed, phase, differential expansion, bearing temperature, rod position and cylinder pressure.

Ordering Bently Nevada parts: what we need

Send the complete part number with every option field, for example 330103-00-05-10-01-00 for a probe or the 3500 module number with its option dashes, plus the matching I/O module number. For probe systems state probe series, system length and the hazardous area approval. A photo of the label avoids transcription errors, and for rack modules the firmware revision is useful.

Browse Bently Nevada products by category: Vibration.