Description
Product Core Brief
- Model: 990-04-50-01-00
- Brand: Bently Nevada
- Series: 990 Vibration Transmitter
- Core Function: Conditions eddy current proximity probe signals into a standard 4-20 mA vibration signal for mechanical control systems.
- Product Type: Vibration Transmitter
- Key Specs: 2-Wire Loop Powered | 0-4 Mils pp Range | 5.0m System Length | DIN Rail Mount
- Condition: New Original (New Surplus)
BENTLY 990-04-50-01-00
Product Introduction
BENTLY 990-04-50-01-00 is a vibration transmitter designed for the Bently Nevada 990 series. It is primarily used in centrifugal air compressors, small pumps, motors, and fans to provide a simple, proportional 4-20 mA vibration signal as an input to mechanical control systems (such as PLC or DCS).
This 2-wire, loop-powered device accepts input signals from Bently Nevada 3300 XL NSv proximity probes and matching extension cables. It conditions the signal into an appropriate peak-to-peak amplitude engineering unit and transmits it as an industrial standard 4-20 mA signal for machinery protection, alarming, and logic control. It features an integrated Proximitor sensor circuit, eliminating the need for external signal conditioning equipment.
Key Technical Specifications
- Module Type: Vibration Transmitter
- System Compatibility: Bently Nevada 3300 XL / 3300 XL NSv Proximity Probes
- Measurement Range: 0-4 Mils Peak-to-Peak (0-100 µm pp)
- System Length: 5.0 Meters (16.4 Feet)
- Mounting Option: 35 mm DIN Rail Clip
- Output Signal: 4 to 20 mA (Proportional to vibration amplitude)
- Certifications: Standard (No special approval options)
- Environmental Protection: Potted construction for high humidity (up to 100% condensing) environments
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Trace source via serial number. Inspect front panel coaxial connectors and terminal blocks for physical damage.
- Visual Inspection: Verify module condition and check for any PCB corrosion or housing damage.
- Live Functional Test: Connect to a compatible 3300 XL NSv probe. Verify 4-20 mA loop output corresponds accurately to simulated vibration inputs.
- Signal Path Test: Utilize the test input pins to verify loop signal output using a function generator.
- Final QC & Packaging: Seal in anti-static bag. Apply QC Passed label with date.
Replacement Pitfall Guide
❗ Sensor Matching: This transmitter is strictly designed for Bently Nevada 3300 NSv / 3300 XL NSv proximity probes. Ensure the correct probe and matching extension cable (5.0m system length) are used.
❗ Range Selection: The “04” in the part number designates a 0-4 Mils (0-100 µm) peak-to-peak measurement range. Ensure this matches your machinery’s vibration tolerance specifications.
❗ System Length: The “50” in the part number indicates a 5.0-meter system length. Using an extension cable of a different length without recalibration will result in inaccurate readings.
❗ Loop Powered: This is a 2-wire loop-powered device. Ensure your control system’s power supply can adequately drive the 4-20 mA loop.
❗ Mounting: This specific model (-01-00) includes a 35 mm DIN rail clip. If your application requires bulkhead screw mounting, a different suffix (e.g., -02-00) is needed.
Keep these in mind and you’ll cut 90% of rework time.
BENTLY 990-04-50-01-00
Compatibility Matrix & Benchmarks
- 990-04-50-01-00 → 990-05-50-01-00 : Alternative — Use 990-05 for a 0-5 Mils (0-125 µm) measurement range
- 990-04-50-01-00 → 990-04-70-01-00 : Alternative — Use -70 variant if a 7.0m system length is required
- 990-04-50-01-00 → 3300 XL NSv Probes : Complementary — Requires matching 3300 XL NSv proximity probe and extension cable
Benchmarks:
- Output Signal: 4-20 mA proportional to vibration peak-to-peak amplitude
- System Length Accuracy: Calibrated specifically for 5.0m cable length
