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The 990-04-70-02-00 is a loop-powered vibration transmitter designed to interface proximity probe systems directly with PLC and DCS platforms. Manufactured by Bently Nevada, it conditions raw eddy-current signals from a...
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The 990-04-70-02-00 is a loop-powered vibration transmitter designed to interface proximity probe systems directly with PLC and DCS platforms. Manufactured by Bently Nevada, it conditions raw eddy-current signals from a 3300 NSv proximity probe and converts them into a standardized 4–20 mA output proportional to shaft vibration (peak-to-peak).
This transmitter is optimized for machinery with small shaft diameters or limited mounting clearance, where installing a full rack-based monitoring system is impractical. Its compact DIN-rail design enables efficient cabinet integration while maintaining reliable shaft vibration measurement.
| Parameter | Specification |
|---|---|
| Model | 990-04-70-02-00 |
| Probe Compatibility | 3300 NSv (Narrow Side View) Proximity Transducer System |
| Output Signal | 4–20 mA DC (Proportional to peak-to-peak vibration) |
| Full-Scale Range | 0 to 4 mils (0 to 100 µm) peak-to-peak |
| Probe System Length | 7.0 meters (–70 option) |
| Mounting Type | 35 mm DIN rail (–02 option) |
| Loop Configuration | 2-wire loop-powered |
| Supply Voltage | 12 to 35 VDC (at transmitter terminals) |
| Buffered Output | Coaxial/BNC connector for dynamic signal access |
| Accuracy | ±5% of full-scale (at calibrated temperature) |
| Enclosure Material | High-density corrosion-resistant polymer |
| Weight | 0.44 kg |
| Dimensions | 10 cm × 7.5 cm × 5.2 cm |
The 990-04-70-02-00 is widely used in:
Centrifugal air compressors
Small process pumps
Industrial cooling fans
Aeroderivative gas turbines
Rotating equipment with shaft diameters < 50 mm
It is particularly suited for applications requiring the 3300 NSv narrow side-view probe technology, enabling accurate vibration monitoring in confined mechanical installations.
Can this be used with a standard 3300 5 mm or 8 mm probe?
No. The 990-04-70-02-00 is specifically calibrated for the 3300 NSv probe series. Using standard 5 mm or 8 mm probes will result in incorrect scaling and measurement inaccuracies.
Does this provide a “Prox Out” signal?
Yes. The unit includes a buffered PROX output via a BNC connector, allowing connection of a portable vibration analyzer without interrupting the 4–20 mA control loop.
