Product Overview
The Bently Nevada 990-05-XX-01-00 is a two-wire, loop-powered vibration transmitter from Bently Nevada’s 990 Series, designed primarily for original equipment manufacturers (OEMs) of centrifugal air compressors, small pumps, motors, and fans who require a simple proportional vibration signal as input to their machinery control systems . The Bently Nevada 990-05-XX-01-00 accepts input from a 3300 NSv proximity probe and matching extension cable, conditioning the signal into peak-to-peak vibration amplitude engineering units and providing a proportional 4 to 20 mA industry-standard output for control system alarming and logic functions .
The Bently Nevada 990-05-XX-01-00 incorporates an integrated Proximitor sensor, eliminating the need for an external unit and reducing installation complexity in space-constrained machinery enclosures . The transmitter features a non-isolated “PROX OUT” and “COM” terminal plus a coaxial connector, providing access to the dynamic vibration and gap voltage signal for diagnostic purposes when connected to battery-powered or isolated test equipment . The Bently Nevada 990-05-XX-01-00 is constructed with potted electronics for high humidity environments up to 100% condensing, and offers a choice of DIN-rail clips or bulkhead mounting screws to simplify integration into diverse machinery installations .
The “XX” in the model designation represents the system length option, which must match the total probe and extension cable length (typically 5.0 or 7.0 meters) to ensure proper calibration and measurement accuracy . The Bently Nevada 990-05-XX-01-00 is configured with a 0 to 5 mils peak-to-peak (0 to 125 µm pp) full-scale range, making it suitable for monitoring general vibration levels on smaller rotating machinery where a continuous monitoring system would be cost-prohibitive .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 990-05-XX-01-00 |
| Manufacturer | Bently Nevada |
| Product Type | Vibration Transmitter |
| Input | 3300 NSv Proximity Probe and Extension Cable |
| Power Requirement | +12 to +35 Vdc |
| Output Signal | 4 to 20 mA (2-wire loop-powered) |
| Full-Scale Range | 0 to 5 mils pp (0 to 125 µm pp) |
| Loop Accuracy | Within ±1.5% over specified full-scale range |
| Probe Gap | 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) |
| Not OK/Signal Defeat | Output < 3.6 mA within 100 μs; restored in 2-3 seconds |
| Power-Up Inhibit | Output < 3.6 mA for 2-3 seconds after power applied |
| Mounting | DIN-rail clips or bulkhead screws |
| Electrical Classification | General Purpose (CSA/NRTL/C), CE mark |