Product Overview
Reliable Machinery Protection with Flexible Mounting
The 990 Vibration Transmitter integrates Proximitor® electronics directly into the transmitter housing, eliminating the need for an external signal conditioner. It receives input from a compatible 3300 NSv proximity probe and extension cable, processes the signal, and provides a linear 4–20 mA vibration output for continuous monitoring.
The transmitter also includes a PROX OUT diagnostic connection that provides dynamic vibration and gap voltage signals for commissioning, troubleshooting, and vibration analysis. A built-in Not OK/Signal Defeat circuit helps prevent false alarms caused by probe or cable failures.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 990-04-XX-03-00 |
| Product Type | Vibration Transmitter |
| Measurement Range | 0–4 mils pp (0–100 μm pp) |
| Output Signal | 4–20 mA, Two-Wire Loop Powered |
| Compatible Probe | 3300 NSv Proximity Probe |
| System Length | XX (5 m or 7 m configuration) |
| Mounting Option | Option 03 – DIN Rail Clips and Bulkhead Mounting Screws |
| Agency Approval | 00 – Standard (No Additional Approval) |
| Frequency Response | 5 Hz to 6 kHz |
| Supply Voltage | +12 to +35 VDC |
| Diagnostic Output | PROX OUT Dynamic Signal |
| Operating Temperature | -35°C to +85°C |
| Housing | Fully Potted Industrial Electronics |
| Approximate Dimensions | 100 × 74 × 53 mm |
| Approximate Weight | 0.43 kg |
Typical Applications
The 990-04-XX-03-00 is designed for continuous vibration monitoring of critical rotating machinery across numerous industries.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, pumps |
| Power Generation | Steam turbines, generators |
| Petrochemical | Compressors, process pumps |
| Manufacturing | Electric motors, fans, blowers |
| Water & Wastewater | Pumping stations |
| OEM Machinery | Compressor and pump packages |
Typical monitoring applications include:
-
Shaft vibration monitoring
-
Continuous machinery protection
-
Predictive maintenance
-
Equipment health trending
-
PLC/DCS integration
-
Alarm and shutdown systems
Key Features & Benefits
Integrated Proximitor® Electronics
Internal signal conditioning reduces wiring complexity and eliminates the need for a separate Proximitor® module.
Standard 4–20 mA Output
The loop-powered analog output provides seamless integration with PLC, DCS, SCADA, and other industrial automation platforms.
Flexible Mounting
Option 03 combines DIN rail clips and bulkhead mounting screws, making installation easier for both OEM equipment and retrofit projects.
Configurable System Length
The XX option allows selection of the proper calibrated 5 m or 7 m transducer system to match the installed probe and extension cable.
Built-In Diagnostics
The PROX OUT connection provides raw vibration and gap voltage signals for calibration, verification, and advanced diagnostics.
Rugged Industrial Design
The fully potted construction provides excellent resistance to moisture, vibration, and contaminants, supporting operation in environments with up to 100% condensing humidity.
Frequently Asked Questions
1. What is the Bently Nevada 990-04-XX-03-00 used for?
It converts shaft vibration measured by a compatible proximity probe into a 4–20 mA signal for machinery monitoring and protection.
2. What does the "04" option indicate?
It specifies a 0–4 mils peak-to-peak (0–100 μm pp) vibration measurement range.
3. What does "XX" represent?
It indicates the configured transducer system length, typically 5 m or 7 m, depending on the ordered configuration.
4. What does the "03" mounting option mean?
Option 03 includes DIN rail clips and bulkhead mounting screws, providing multiple installation methods.
5. What does the "00" approval option indicate?
It designates the standard version without additional hazardous-area certification.
6. Which probe is compatible?
The transmitter is designed for use with the 3300 NSv proximity probe and the matching extension cable.
7. What power supply is required?
The transmitter operates from a +12 to +35 VDC two-wire loop-powered supply.
8. Does it provide a diagnostic output?
Yes. A PROX OUT terminal provides dynamic vibration and gap voltage signals for diagnostics and waveform analysis.
9. Can it connect directly to a PLC or DCS?
Yes. The standard 4–20 mA output is intended for direct connection to industrial automation systems.
10. Which machines commonly use this transmitter?
It is widely installed on compressors, pumps, motors, fans, and other rotating equipment requiring continuous vibration monitoring.
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