Bently Nevada 990-04-XX-01-00 990 Vibration Transmitter

Product Overview

The Bently Nevada 990-04-XX-01-00 (MOD:147202-01) serves as a high-performance vibration transmitter designed for continuous machinery protection. This compact device integrates the proximity probe driver and signal conditioning into a single unit. It converts the complex signal from a proximity probe into a standard 4-20 mA DC output, allowing direct integration into PLCs or DCS without requiring an external rack system. We provide this unit as 100% brand new, original equipment manufactured in the USA.

Part Number Breakdown

The 990 series utilizes a specific coding structure to define mounting options and certifications. While the "XX" in your specific request denotes variable configurations, the standard structure for the 990-04 follows this logic:

Technical Specifications

The following table highlights the core technical performance of the 990-04-XX-01-00:

Engineering Advantages

• Space-Efficient Integration: The ultra-compact footprint eliminates the need for bulky monitoring racks. Engineers mount these units directly onto the machine skid or inside local junction boxes to save significant enclosure space.

• Direct PLC Interface: The 4-20 mA loop-powered design simplifies wiring. You connect the transmitter directly to any standard analog input card, reducing installation costs and complex software configurations.

• Signal Integrity: The 990-04-XX-01-00 provides a separate buffered output. This allows technicians to connect portable data collectors for diagnostic analysis without interrupting the primary 4-20 mA safety loop.

• Reliability in Extreme Environments: Built with rugged internal circuitry, this transmitter handles the high-temperature and high-vibration conditions common in gas turbine and compressor applications.

FAQs

• Does this transmitter require a separate Proximitor?

  No. The 990-04-XX-01-00 functions as both the driver and the transmitter. It replaces the traditional Proximitor by outputting a 4-20 mA signal directly.

• What probe system is compatible with the 990-04?

  It operates optimally with Bently Nevada 3300 or 3300 XL 8mm proximity probes. Ensure the system length (probe plus extension cable) matches the transmitter calibration (typically 5 or 9 meters).

• How do I verify the output accuracy during commissioning?

  Use the "Prox" and "COM" terminals to measure the gap voltage. This allows you to set the mechanical gap of the probe accurately before relying on the 4-20 mA vibration reading.

• Is this unit suitable for hazardous area installations?

  Yes, depending on the "XX" option code. Most 990 units carry North American (CSA) and European (ATEX/IECEx) certifications for Zone 0, 1, and 2 environments.