Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 990-05-50-01-00 |
| Manufacturer | Bently Nevada |
| Product Type | 2-Wire Vibration Transmitter |
| Product Series | 990 Series |
| Input Compatibility | 3300 NSv Proximity Probe |
| Output Signal | 4-20 mA (2-wire loop-powered) |
| Measurement Range | 0-5 mils pp (0-125 μm pp) |
| Power Supply | +12 to +35 VDC |
| Maximum Loop Resistance | 1,000 Ω at 35 VDC |
| Current Limit | ~23 mA typical |
| Mounting Type | 35 mm DIN Rail Clips |
| System Length | 5.0 meters (16.4 feet) |
| Frequency Response | 5 Hz to 6000 Hz |
| Full Scale Accuracy | ±1.5% |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -52°C to +100°C |
| Relative Humidity | 100% condensing |
| Country of Origin | USA |
| Weight | 0.43 kg (approximate) |
| Dimensions | 53.3 mm × 73.9 mm × 100.1 mm |
Main Features and Advantages
Integrated Proximitor Design Eliminates External Hardware
The Bently Nevada 990-05-50-01-00 incorporates the Proximitor sensor electronics directly into the transmitter housing, removing the need for a separate Proximitor unit and its associated cabling. This integration simplifies installation in OEM equipment panels where panel space is at a premium, and it reduces the number of potential failure points in the signal chain. The potted construction provides protection against high humidity and condensing environments, with the transmitter rated for operation in conditions up to 100% relative humidity .
Diagnostic Access Without Interrupting the Loop
A distinctive feature of the Bently Nevada 990-05-50-01-00 is the front-panel PROX OUT coaxial connector, which provides access to the dynamic vibration signal and gap voltage for machinery diagnostics. This output allows technicians to connect portable analyzers or oscilloscopes for detailed fault investigation—such as identifying bearing defects or imbalance—without breaking the 4-20 mA loop or disrupting the protection function. A Test Input pin is also provided for quick verification of the loop signal output using a function generator . For applications requiring signal isolation between test equipment and the loop, Bently Nevada offers an optional 990/991 Test Adapter that is strongly recommended for all diagnostic connections .
Robust Signal Integrity and Fault Detection
The Bently Nevada 990-05-50-01-00 includes several protective features that maintain signal integrity in industrial environments. A Power-up Inhibit circuit holds the output below 3.6 mA for 2-3 seconds after power application, preventing false alarms during system startup. A Not OK/Signal Defeat circuit drives the output to less than 3.6 mA within 100 microseconds if a probe fault or loose connection is detected, ensuring that downstream control systems recognize the fault condition rather than interpreting a faulty signal as a valid reading . Non-interacting zero and span potentiometers allow calibration adjustments without affecting each other, simplifying field setup .
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