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    Apter Power provides brand-new, factory-current Bently Nevada 990 transmitters, delivering an authentic and streamlined solution for continuous centrifugal compressor and pump protection.

990-08-50-01-05

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The Bently Nevada 990-08-50-01-05 Vibration Transmitter is an integrated, two-wire, loop-powered device engineered to provide a simple, reliable 4 to 20 mA proportional vibration signal directly to a machinery control system.
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Technical specifications for 990-08-50-01-05

  • Manufacturer:
    Bently Nevada
  • Part Number:
    990-08-50-01-05
  • Product Family:
    990 Vibration Transmitter
  • Product Type:
    Vibration Transmitter
  • Stock:
    1
  • Full-scale:
    0-8 mils pp (0-200 μm pp)
  • System Length:
    5.0 meters (16.4 feet)
  • Mounting Option:
    35 mm DIN rail clips
  • Vibration Input:
    3300 NSv Proximity Probe
  • Output Signal:
    4–20 mA (proportional output)
  • Signal Units:
    Peak-to-Peak vibration amplitude
  • Power Supply:
    Two-wire, loop-powered
  • Integrated Function:
    Built-in Proximitor Sensor
  • Weight:
    0.5 kg
  • Estimated shipping dimensions:
    10.0 cm × 7.5 cm × 5.2 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Use Cases Temperature & Humidity Range Safety & Compliance

Features:

  • Interface Between the 3300 NSv Proximity Probe and Machinery Control System
  • Combines Signal Conditioning with Proportional 4 to 20 mA Vibration Output
  • Operates in Conjunction with Centrifugal Air Compressors, Small Pumps, Motors, and Fans
The Bently Nevada 990-08-50-01-05 Vibration Transmitter operates as a two-wire, loop-powered device designed primarily for original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans. It continuously accepts input from the 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options), 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. Seamless integration with existing control systems is standard with the 990-08-50-01-05, however using the Test Input pin allows quick verification of loop signal output using a function generator as the input.

The 990-08-50-01-05 provides essential vibration monitoring functions common to rotating machinery, and is a critical component of the protection path, directly affecting the proper, normal operation of the overall machinery control system. One 990-08-50-01-05 transmitter is required per monitoring point depending on the desired coverage level. The 990-08-50-01-05 offers a choice of DIN-rail clips or bulkhead mounting screws as standard options and is always suitable for installation in small areas with minimal clearance, typical of centrifugal air compressors.

For high humidity environments, the 990-08-50-01-05 Vibration Transmitter requires no additional enclosure as it features potted construction for environments up to 100% condensing. In addition to standard signal output operation, the diagnostic configuration also performs dynamic vibration and gap voltage signal output. The 990-08-50-01-05 diagnostic system executes output using the Non-isolated PROX OUT and COM terminals plus a coaxial connector specified in the transmitter options.

The 990-08-50-01-05 Bently Nevada Vibration Transmitter may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 990-08-50-01-05 Vibration Transmitter Manuals,Datasheets,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. All prices are shown in USD.
Bently Nevada 990-08-50-01-05 Vibration Transmitter Specs

General

  • Manufacturer Bently Nevada
  • Model 990-08-50-01-05
  • Condition New Original ready stock
  • Product Family 990-08-50-01-00,990-08-50-01-01
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Centrifugal Air Compressors: Monitors high-speed shaft displacement within tight clearance boundaries.
  • Industrial Pumps: Tracks radial vibration to detect early signs of unbalance, misalignment, or bearing wear.
  • Electric Motors & Fans: Continuous safety monitoring on small-to-medium balance-critical air handlers.
  • Hazardous Area Diagnostics: Provides a dynamic vibration and gap voltage signal via non-isolated "PROX OUT" and "COM" terminals for temporary diagnostic tools.
  • Transmitter Unit Operating Temperature: -35°C to +85°C (-31°F to +185°F).
  • Transmitter Unit Storage Temperature: -51°C to +100°C (-60°F to +212°F).
  • Associated Probe Operating Temperature: -35°C to +177°C (-31°F to +350°F).
  • Relative Humidity: Up to 100% condensing, non-submerged.
  • North American Standards (CSA): Class I, Division 1, Groups A, B, C, and D. Class I, Division 2, Groups A, B, C, and D.
  • European Standards (ATEX/IECEx): II 1 G Ex ia IIC T4 (Zone 0). II 3 G Ex nA IIC T4 (Zone 2).
  • Maritime Approvals: Certified by the American Bureau of Shipping (ABS).
  • Electromagnetic Compatibility: Holds the CE mark and satisfies FCC Part 15 rules.
Description
Bently Nevada 990-08-50-01-05 Vibration Transmitter is specifically designed for original equipment manufacturers (OEMs) of centrifugal air compressors, small pumps, motors, or fans who require a straightforward 4 to 20 mA proportional vibration signal as the input to their machinery control system. This transmitter effectively addresses the challenge of providing reliable vibration monitoring in compact machinery setups where space is limited and simplicity is essential.

The 990-08-50-01-05 Vibration Transmitter is a two-wire, loop-powered device that accepts input from the 3300 NSv proximity probe and its matching extension cable, available in 5 m and 7 m system length options. The 990-08-50-01-05 conditions the signal into appropriate peak-to-peak vibration amplitude engineering units and delivers this value as a proportional 4 to 20 mA industry-standard signal to the control system, where machinery protection alarming and logic occur. The 990-08-50-01-05 transmitter features an Integrated Proximitor Sensor that requires no external unit, and includes Non-isolated PROX OUT and COM terminals plus a coaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics. The 990-08-50-01-05 also includes Non-interacting zero and span potentiometers under the Transmitter label to support loop adjustment, along with a Test Input pin for quick verification of loop signal output using a function generator as the input.

The 990-08-50-01-05 Vibration Transmitter is widely applied in industrial rotating equipment monitoring, particularly in centrifugal air compressors, small pumps, motors, and fans. Its compatibility with the 3300 NSv proximity probe enables transducer installation in small areas with minimal clearance, which is typical of centrifugal air compressors. The 990-08-50-01-05 is suitable for environments with high humidity up to 100% condensing, thanks to its potted construction. The 990-08-50-01-05 offers a choice of DIN-rail clips or bulkhead mounting screws as standard options, simplifying installation and integration into existing control systems. A Not OK/Signal Defeat circuit in the 990-08-50-01-05 prevents high outputs or false alarms due to a faulty proximity probe or loose connection, ensuring reliable operation in critical machinery protection applications.
Alternative Names
990 08 50 01 05 990-08-50-01-00 990-08-50-01-01 990-08-50-02-05 990-08-50-03-05 990-08-70-01-05
Technical notes
The Bently Nevada 990-08-50-01-05 vibration transmitter integrates a proximity sensor and transmitter into a single unit. This transmitter converts raw proximity signals into precise peak-to-peak vibration amplitude engineering units, enabling seamless mechanical protection alarms and logic control without the need for external processing units.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What problems does the Bently Nevada 990-08-50-01-05 Vibration Transmitter solve?
The transmitter is designed for vibration monitoring in confined spaces and harsh environments, helping eliminate false alarms, improve measurement reliability, and maintain stable operation under high humidity conditions.
How does the 990-08-50-01-05 transmitter reduce false alarms?
Its integrated Not OK/Signal Defeat circuit automatically clamps the output whenever a probe fault or loose connection is detected, preventing invalid vibration signals from reaching the control system.
What features support field calibration and diagnostics?
The transmitter includes independent zero and span adjustment potentiometers, a dedicated Test Input for function generator verification, and PROX OUT/COM terminals with a coaxial connector for diagnostic measurements.

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