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The 990-05-50-01-00 is a 2-wire vibration transmitter that converts vibration sensor signals into a 4 to 20 mA proportional output. It features an integrated Proximitor sensor for continuous machinery monitoring, primarily on centrifugal air compressors and smaller rotating equipment.
Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustmentn
Test Input pin for quick verification of loop signal output, using a function generator as the input
Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting
The 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system. The transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options).
The transmitter conditions the signal into appropriate peak to-peak vibration amplitude engineering units, and provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery protection alarming and logic occurs. 990-05-50-01-00 features a fully enclosed, compact, and anti-static polymer housing that protects the entire hardware module.
The base is equipped with integrated 35 mm DIN rail clips (Option -01), allowing it to be securely locked side-by-side in high density on the electrical rails inside the control cabinet. The transmitter exhibits minimal temperature drift across a wide operating temperature range from 0°C to +55°C. Its output terminals integrate reverse polarity protection and lightning-strike surge current-limiting circuitry, which effectively counters transient surge interference caused by high-power variable frequency drives (VFDs) and large motor startups on the industrial floor, thereby ensuring the hardware signal chain of the input control system remains in a stable and compliant state over the long term.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 990-05-50-01-00 Vibration Transmitter Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas Exploration
Applied in small centrifugal oil transfer pumps or water injection pumps along oil and gas pipelines. The transmitter monitors radial shaft vibration in real time, sending 4-20 mA signals to the PLC to prevent oil leaks caused by bearing wear.
Petrochemical & Refining
Used in small auxiliary centrifugal compressors within distillation and hydrogenation units. It precisely monitors the relative displacement of high-speed rotating shafts within a 0-5 mils full-scale range to prevent compressor surge or impeller damage.
Thermal Power Plants
Utilized for shaft vibration monitoring of boiler feedwater pumps, induced draft (ID) fans, or forced draft (FD) fans. It sends vibration signals directly into the DCS to execute over-limit safety interlocking logic.
Air Separation & Industrial Gases
Deployed in oxygen/nitrogen centrifugal air compressors within large air separation units. Mounted on critical bearing housings, transmitters are installed side-by-side on DIN rails inside the cabinet to save monitoring space for multi-stage compressors.
Steel & Metallurgical Industry
Used in blast furnace blowers, converter gas fans, and large exhaust fans. The transmitter's anti-static housing and surge protection circuits effectively counter strong electromagnetic interference caused by high-power variable frequency drives (VFDs) on the shop floor.
When installing and maintaining the 990-05-50-01-00, ensure that the total system length of the transmitter, probe, and extension cable remains strictly at 5.0 meters; never cut or splice the cables. During external wiring, the loop voltage must be maintained within 12–35 VDC, and the 4-20 mA signal lines must be shielded and grounded at a single point to prevent industrial electromagnetic interference. When reading dynamic waveforms via the PROX OUT terminal, non-isolated testing instruments must be used, and short-circuiting this terminal directly to the COM terminal is strictly prohibited.
The Bently Nevada 990-05-50-01-00 is a two-wire, loop-powered industrial vibration transmitter configured for use with 3300 NSv proximity probes. The hardware converts shaft bearing displacement into a standard 4-20 mA current output with a measurement range of 0-5 mils peak-to-peak (0-125 µm). This specific model matches a 5.0-meter total system length, features a 35 mm standard DIN rail mount, and includes no agency approval option. The module integrates a Not OK sensor failure circuit and provides a PROX OUT diagnostic terminal for dynamic waveform reading.
It is a two-wire, loop-powered industrial vibration transmitter that directly converts mechanical vibration into a standard 4-20 mA current signal.
What physical mounting interface does the 990-05-50-01-00 use?
The
Which model of proximity probe should be connected to the 990-05-50-01-00?
It must be connected to a Bently Nevada 3300 NSv proximity probe and its matching extension cable.
What electrical signals does the 990-05-50-01-00 receive and output?
It receives the eddy-current gap voltage from the probe and outputs a proportional 4-20 mA current signal to a control system (PLC/DCS).
How to perform field diagnostics and dynamic waveform testing on the 990-05-50-01-00?
Dynamic vibration signals can be read by connecting an oscilloscope directly to its non-isolated PROX OUT and COM terminals (or coaxial connector).
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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