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990-05-50-02-00

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The Bently Nevada 990-05-50-02-00 is a vibration transmitter designed for OEM integration into centrifugal air compressors, pumps, motors, and fans, providing a 4 to 20 mA proportional vibration signal.
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Technical specifications for 990-05-50-02-00

  • Manufacturer:
    Bently Nevada
  • Part Number:
    990-05-50-02-00
  • Product Family:
    990 Vibration Transmitter
  • Device Type:
    Vibration Transmitter
  • Primary Output:
    4 to 20 mA analog signal
  • Full-Scale Range:
    0–5 mils peak-to-peak
  • System Length:
    5.0 meters (16.4 feet)
  • Mounting Method:
    Bulkhead screws
  • Recommended Accessory:
    990/991 Test Adapter
  • Agency Approval:
    Not required
  • Weight:
    0.46 kg
  • Estimated shipping dimensions:
    7.4x5.3x9.9cm
  • 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.
Description
The Bently Nevada 990-05-50-02-00 is a compact, industrially-hardened vibration transmitter engineered primarily for Original Equipment Manufacturers (OEMs) of rotating machinery such as centrifugal air compressors, small pumps, motors, and fans. 

Its core function is to transduce mechanical vibration into a standardized 4 to 20 mA analog output signal that is directly compatible with most Programmable Logic Controllers (PLCs) and Distributed Control Systems (DCSs), simplifying integration into broader machinery control and protection networks. 

A key feature of the 990-05-50-02-00 is its integrated PROX OUT coaxial connector. This port provides direct access to the raw, dynamic transducer signal, enabling on-site machinery diagnostics without interrupting the primary 4–20 mA loop. 

However, it is critical to note that this PROX OUT signal is non-isolated from the main current loop. To safely and effectively use this diagnostic output with common test equipment like oscilloscopes or spectrum analyzers—especially those that are AC-powered—Bently Nevada strongly recommends the use of the 990/991 Test Adapter. 

The physical design of the 990-05-50-02-00 emphasizes straightforward installation and durability. The unit is supplied with a total system length of 5.0 meters (16.4 feet), providing ample cable for typical mounting arrangements. 

Installation is achieved via bulkhead screws, a simple and robust mounting method suitable for panel or enclosure walls. While the 990-05-50-02-00 does not require specific agency approvals for its core function, its design is focused on delivering reliable performance in typical industrial environments. 

In summary, the 990-05-50-02-00 occupies a specific niche in the condition monitoring landscape. It is not a replacement for high-performance proximity probe systems like the 3300 series but serves as an accessible entry point for continuous vibration monitoring. 
Alternative Names
990-08-50-02-00 990-05-70-02-00 990-05-50-03-00 990-05-50-02-05
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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 is the primary function and output signal of the 990-05-50-02-00 vibration transmitter?
The 990-05-50-02-00 is designed to convert mechanical vibration into a standardized industrial control signal. Its primary output is a two-wire, 4 to 20 mA analog current loop that is linearly proportional to the vibration level, with 0 mA typically representing 0 mils and 20 mA representing the full-scale value of 5 mils peak-to-peak (125 μm pp). This makes it directly compatible with most PLC and DCS analog input modules.
What is the purpose of the PROX OUT connector on the 990-05-50-02-00, and what critical precaution must be observed when using it?
The PROX OUT coaxial connector on the 990-05-50-02-00 provides access to the raw, dynamic voltage signal from the internal transducer for diagnostic purposes, such as periodic waveform or spectrum analysis. The critical precaution is that this signal is not electrically isolated from the 4–20 mA loop. To prevent ground loops, equipment damage, or safety hazards—especially when connecting to AC-powered test equipment—the use of the 990/991 Test Adapter for signal isolation is strongly recommended.
For what types of machinery and by whom is the 990-05-50-02-00 primarily intended?
The 990-05-50-02-00 is primarily intended for Original Equipment Manufacturers (OEMs) who build centrifugal air compressors, small pumps, motors, or fans. It is designed for integration at the factory to provide these machines with a built-in, simple vibration output. End-users benefit from a basic, continuous vibration signal for their control system without needing to install a more complex separate monitoring system.
What are the key physical installation specifications for the 990-05-50-02-00?
The 990-05-50-02-00 is supplied as a complete unit with a total integrated cable length of 5.0 meters (16.4 feet). It is designed for secure mounting using bulkhead screws, which allow it to be firmly attached to a panel or enclosure wall. This straightforward mechanical design facilitates easy installation in various industrial settings without the need for specialized mounting hardware.

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