Bently Nevada 990-04-70-01-00 2-Wire Vibration Transmitter
Overview
The Bently Nevada 990-04-70-01-00 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 0-4 mils pp (0-100 µm pp) full-scale range, a 7.0 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 | 990-04-70-01-00 |
| Full-scale option | 04: 0-4 mils pp (0-100 µm pp) |
| System length option | 70: 7.0 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 |
| Total system weight | 0.82 kg typical |
| Mounting holes | 5.8 mm diameter, 4 places |
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 990-04-70-01-00 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 number is therefore a 0-4 mil (the most sensitive of the four ranges), 7.0 m, DIN-rail unit. Because it ends in 00 it has no hazardous-area approval and should not be selected for classified locations.
Bently Nevada 990-04-70-01-00 Selection Notes
The manufacturer is explicit about what a loop-powered transmitter cannot do. The 4 to 20 mA signal carries only overall peak-to-peak amplitude, so phase cannot be derived from it, and monitor functions such as gap alarms, Timed OK channel defeat, Danger Bypass and Trip Multiply are not available. A PLC or DCS reading the loop can trend and alarm on overall vibration but will not capture waveform data when an alarm occurs. Where diagnostics are needed, the PROX OUT signal has to be used with portable test equipment.
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 990-04-70-01-00 2-Wire Vibration Transmitter
Submit a formal inquiry through our RFQ page with the transmitter part number 990-04-70-01-00, 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
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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 | You are viewing this model |
| Bently Nevada 990-05-50-01-00 2-Wire Vibration Transmitter | Vibration Monitoring | View details |
| Bently Nevada 990-05-70-02-00 2-Wire Vibration Transmitter | Vibration Monitoring | View details |
- Datasheet Bently Nevada 990-04-70-01-00 2-Wire Vibration Transmitter Datasheet Download
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.
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