990-08-XX-01-00 | Bently Nevada 990 Series Vibration Transmitter

Product Overview

The Bently Nevada 990-08-XX-01-00 (MOD:283278-01) provides continuous machinery protection by converting radial vibration into a proportional 4-20 mA DC signal. This loop-powered transmitter integrates the Proximitor sensor functionality and signal conditioning into a single, compact housing. It eliminates the requirement for external racks, allowing direct connection to a PLC or DCS analog input card. We supply this unit as 100% brand new, original equipment manufactured in the USA.

Part Number Breakdown

The 990-08 configuration identifies the specific measurement and mounting parameters:

Technical Specifications

This transmitter conditions signals with high linearity for critical rotating assets:

• Output Signal: 4-20 mA DC (Proportional to vibration amplitude).

• Full-Scale Range: 0 to 8 mils peak-to-peak (200 μm).

• Dimensions: 20.5 cm x 22.4 cm x 3.3 cm.

• Weight: 0.1 kg (Unit only).

• Input Compatibility: Bently Nevada 3300 or 3300 XL Proximity Probes.

• Power Supply: 12 to 35 Vdc (Loop-powered).

• Country of Origin: USA.

Engineering Advantages

• Optimized for High Vibration Limits: The 0-8 mils full-scale range accommodates machinery with higher vibration thresholds, providing sufficient headroom for monitoring larger centrifugal compressors and fans.

• Direct Signal Transmission: The transmitter converts the complex eddy current signal to a robust 4-20 mA current loop locally. This protects data integrity from electromagnetic interference (EMI) during transmission to remote control rooms.

• Buffered Output Port: The module includes a separate buffered voltage signal. Maintenance teams connect portable data collectors directly to this port for real-time wave-form analysis without interrupting the primary safety loop.

• Simplified Installation: The 35 mm DIN rail clip mounting enables high-density installation within local junction boxes. The slim profile saves significant enclosure space compared to traditional rack-mounted monitoring systems.

FAQs

• Does this transmitter require a separate Proximitor?

  No. The 990-08-XX-01-00 combines the probe driver and the signal conditioner. It replaces the Proximitor by outputting a 4-20 mA signal directly to your control system.

• How do I verify the probe gap during setup?

  The transmitter provides "Prox" and "COM" terminals. Use a digital multimeter to measure the DC gap voltage. This ensures the probe resides in the center of the linear range before you finalized the mechanical mounting.

• What happens if I use a 5-meter probe with a 7-meter (XX=70) transmitter?

  The system will lose calibration. You must match the transmitter’s "XX" code to the total electrical length of your probe and extension cable to maintain measurement accuracy.

• Is this a genuine Bently Nevada product?

  Yes. We guarantee the 990-08-XX-01-00 is 100% brand new and original factory stock. Every unit comes in original packaging with full manufacturer traceability from the USA.