990-08-XX-03-00 | Bently Nevada 990 Series Vibration Transmitter

Product Overview

The Bently Nevada 990-08-XX-03-00 integrates a proximity probe driver and signal conditioner into a single, compact module. It converts radial vibration data into a standard 4-20 mA DC output, enabling direct machinery monitoring via a PLC or DCS without requiring an external monitor rack. This unit specifically accepts inputs from 3300 NSv proximity probes, making it the primary choice for monitoring shafts with small diameters or restricted side clearances. We supply this product as 100% brand new and original equipment.

Part Number Breakdown

The 990-08 series configuration follows a modular logic to match specific system requirements:

Technical Specifications

The 990-08-XX-03-00 conditions signals with high precision for industrial rotating assets:

• Input Signal: Accepts 3300 NSv proximity probe and extension cable.

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

• Frequency Response (± 10%): 10 Hz to 1 kHz (600 cpm to 60 kcpm).

• Frequency Response (± 3 dB): 1 Hz to 10 kHz (60 cpm to 600 kcpm).

• Sensitivity: 10.2 mV/m/s² (100 mV/g) ± 20%.

• Mounting: Supports both 35mm DIN-rail and bulkhead screw mounting.

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

Engineering Advantages

• Optimized for Restricted Clearances: Designed for use with the 3300 NSv (Narrow Side View) probe, this transmitter maintains signal linearity in tight mechanical spaces where standard probes suffer from "side-view" interference.

• Rackless Installation: The loop-powered design removes the need for centralized monitoring racks. Engineers mount the transmitter directly in local junction boxes near the machine skid, reducing cabling costs and cabinet footprint.

• High Noise Immunity: The transmitter conditions the sensitive high-frequency eddy current signal into a robust 4-20 mA current loop locally. This ensures data integrity over long distances, even in environments with heavy electromagnetic interference (EMI).

• Flexible Mounting Options: The "03" option provides both DIN-rail clips for rapid cabinet installation and bulkhead screws for high-vibration mounting scenarios where extra physical security is required.

FAQs

• Can I use a standard 3300 XL 8mm probe with this transmitter?

  No. This model specifically matches the impedance and calibration of the 3300 NSv proximity probe. Using a standard 8mm probe will cause significant measurement errors and non-linear output.

• How do I verify the probe gap during installation?

  The transmitter features "Prox" and "COM" terminals. Connect a digital multimeter to these points to measure the DC gap voltage. This allows you to set the mechanical gap accurately before finalizing the installation.

• What happens if the probe cable breaks?

  The transmitter includes an "OK" circuit logic. If the system detects a probe fault or cable rupture, the 4-20 mA signal drops below 3.6 mA. This allows your PLC/DCS to identify a sensor fault rather than triggering a false high-vibration alarm.

• Is this unit refurbished or new surplus?

  Neither. We guarantee this unit is 100% brand new, factory-original Bently Nevada stock, shipped in original packaging with full manufacturer traceability.