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Product Overview
The Bently Nevada 990-04-50-02-CN is a two-wire, loop-powered vibration transmitter engineered for continuous, non-contact shaft vibration monitoring of rotating machinery. As part of the 990 Series, the Bently Nevada 990-04-50-02-CN is designed specifically for original equipment manufacturers (OEMs) of centrifugal air compressors, small pumps, motors, and fans who require a simple 4-20 mA proportional vibration signal as input to their machinery control systems. This transmitter accepts input from a single 3300 NSv proximity probe and extension cable, converting the dynamic displacement measurement into an industry-standard analog signal for integration into PLCs, DCS, or dedicated monitoring systems.
The Bently Nevada 990-04-50-02-CN differentiates itself through its fully integrated design, incorporating the Proximitor sensor electronics directly into the transmitter housing, thereby eliminating the need for a separate external proximitor unit. This feature, combined with its compact form factor, allows for installation in tight spaces typical of OEM equipment packages. The Bently Nevada 990-04-50-02-CN is a practical and cost-effective solution for general vibration trending and protection, providing reliable shaft relative vibration data to support predictive maintenance strategies while maintaining a simpler architecture compared to full continuous monitoring systems.
Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 990-04-50-02-CN |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Product Type | Two-Wire Loop-Powered Vibration Transmitter |
| Full-Scale Range | 0 – 4 mils peak-to-peak (0 – 100 µm pk-pk) |
| System Length | 5.0 meters (16.4 feet) |
| Mounting Option | Bulkhead Screws |
| Input | Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable |
| Power Supply | +12 to +35 Vdc (at transmitter terminal) |
| Output Signal | 4 – 20 mAdc (2-wire configuration) |
| Loop Accuracy | ±1.5% over specified full-scale range |
| Probe Gap Range | 0.5 to 1.75 mm (20 to 55 mils) from target |
| Maximum Loop Resistance | 1,000 Ω (including cable at 35 Vdc) |
| Frequency Response | 5 Hz to 6,000 Hz (+0, -3 dB) |
| Prox Out Output Impedance | 10 kΩ (calibrated for 10 MΩ load) |
| Operating Temperature (Transmitter) | -35°C to +85°C (-31°F to +185°F) |
| Storage Temperature (Transmitter) | -52°C to +100°C (-62°F to +212°F) |
| Relative Humidity | 100% condensing (non-submerged) |
| Dimensions (H x W x D) | 53.3 x 73.9 x 100.1 mm |
| Weight (Transmitter) | Approx. 0.43 kg (0.9 lb) |
| Minimum Target Size | 9.5 mm (0.375 in) diameter |
