Bently Nevada 990-05-50-01-00 2-Wire Vibration Transmitter
Overview
The Bently Nevada 990-05-50-01-00 is a 2-wire vibration transmitter from the 990 series, converting the vibration level of a machine into a proportional 4 to 20 mA signal for the machinery control system. Designed for OEMs of centrifugal air compressors and for small pumps, motors and fans, the 990 replaces complex monitoring arrangements with a single compact transmitter. This configuration carries the 0-5 mils peak-to-peak full-scale option, a 5.0 metre system length, DIN rail clip mounting and no agency approval option.
The 0-5 mils full-scale option is the most common 990 configuration, matching the typical vibration alarm ranges used on centrifugal air compressors and small rotating equipment. The 5.0 metre system length fits compact machine skids where the junction box and the control panel are on the same baseplate, and the DIN rail clip mounting lets the transmitter be fitted into any standard 35 mm rail panel. The same mounting and supply arrangements apply across the 990 family, so a spare unit can be re-issued between machines with only the configuration labels checked.
Engineering and Design
The transmitter accepts the probe signal, conditions it and drives the loop current proportional to the vibration full-scale, giving the control system a live vibration value on a standard 4 to 20 mA input. The 05 full-scale option spans 0-5 mils pp (0-125 micrometres) and the loop is powered from a 28 V supply, with a buffered gap voltage output for diagnostics. The 2-wire connection keeps the field wiring to a single screened pair.
The 01 mounting option fits the transmitter with 35 mm DIN rail clips for quick panel installation. The 5.0 metre system length matches the probe and cable run, and the loop output is wired to the controller with the loop resistance kept within the transmitter specification. During commissioning the gap voltage and the loop current are checked together to confirm the reading corresponds to the actual vibration amplitude.
The 990-05-50-01-00 is verified by checking the loop current against the machine vibration level and recording the buffered gap voltage during shutdown. The 5.0 metre system length is fixed at manufacture, so a replacement transmitter must carry the same length option as the installed probe and cable. DIN rail mounting makes the replacement straightforward: the clips release with a pull, the loop wires are transferred and the new unit is clipped on and checked at the 4, 12 and 20 mA points. The 28 V loop supply is confirmed before commissioning, and the total loop resistance is checked so the transmitter can drive the full current range. The same rail clip profile is used across the 990 family, so a spare unit exchanged between machines fits the existing panel without modification.
Key Features
- 2-wire 4 to 20 mA proportional vibration output
- 0-5 mils pp (0-125 micrometres) full-scale option
- 5.0 metre system length configuration
- 35 mm DIN rail clip mounting
- Buffered gap voltage output for diagnostics
- Loop powered from 28 V supply
- Compact transmitter for OEM and retrofit duty
Applications
The 990 series is used on centrifugal air compressors, small pumps, motors, fans and blowers on packaged and skid-mounted equipment, where the control system needs a live vibration value rather than alarm contacts. The 5.0 metre configuration suits compact machine skids with a nearby junction box.
Specifications
| Part number | 990-05-50-01-00 |
| Series | 990 2-wire vibration transmitter |
| Full-scale | 05 (0-5 mils pp, 0-125 micrometres) |
| System length | 50 (5.0 m) |
| Mounting | 01 (35 mm DIN rail clips) |
| Approvals | 00 (not required) |
| Output | 4 to 20 mAdc proportional |
| Loop supply | 28 V |
Why Seven Star LLC
Seven Star LLC supplies verified Bently Nevada 990 series transmitters to OEM and maintenance programmes across Oman and the GCC. Every 990 is checked against the complete part number and system length before your order is confirmed, and our team confirms the full-scale option and mounting for your control panel.
Technical Specifications
The Bently Nevada 990-05-50-01-00 is a loop-powered, 2-wire radial vibration transmitter from the 990 family, combining a 3300 NSv proximity probe, extension cable, and DIN-rail-mounted transmitter in a single OEM-oriented package. This configuration provides a 0–5 mils peak-to-peak full-scale displacement range over a 5.0m system length, with DIN-rail clip mounting and no hazardous-area agency approval on this specific order.
Output is 4–20mA proportional to peak-to-peak displacement at ±1.5% accuracy, from a +12 to +35V DC loop supply with a maximum loop resistance of 1,000Ω. The probe has a frequency response of 5Hz–6kHz (+0/-3dB) and a scale factor of 7.87mV/µm (200mV/mil) ±6.5%. Construction uses a PPS probe tip, AISI 303/304 stainless steel probe case, and 75Ω FEP-insulated coaxial cable, with the potted transmitter rated for up to 100% condensing humidity. Operating temperature is -35°C to +85°C for the transmitter and -52°C to +177°C for the probe.
Certifications and Applications
The 990 family carries cNRTLus Class I Division 1&2 Groups A–D T4, ATEX/IECEx Zone 0/2 (Ex ia/ec IIC T4), RoHS compliance, and optional ABS marine approval. Baker Hughes positions this transmitter family specifically for OEMs of centrifugal air compressors, small pumps, motors, and fans requiring basic radial vibration protection and trending without a full multi-channel monitoring rack.
Why Seven Star LLC
Seven Star LLC supplies genuine Bently Nevada (Baker Hughes) 990-series vibration transmitters to OEMs and end users across Oman and the wider GCC, and confirms the exact full-scale range, system length, and mounting style required to match the customer’s machine before confirming an order.
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, your vibration full-scale requirement and system length. We will confirm the correct 990 configuration and respond with a formal quotation. | Inquiry Form
Related Products
Bently Nevada, a division of Baker Hughes, is a global leader in asset condition monitoring and protection technologies. For over six decades, the company has set the industry standard in machinery diagnostics, vibration analysis, and predictive maintenance solutions.
Its advanced systems and sensors are designed to ensure maximum equipment uptime, safety, and efficiency across power generation, oil & gas, and industrial manufacturing sectors. From vibration probes and monitoring racks to software platforms like System 1, Bently Nevada products enable real-time insight and data-driven decision-making.
Seven Star LLC supplies genuine Bently Nevada equipment, sensors, and monitoring solutions to clients across the Middle East, providing trusted reliability, expert support, and seamless integration for modern industrial operations.
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