The Bently Nevada 990-05-50-02-00, also cataloged as the 990 Vibration Transmitter, operates as a dedicated hardware component for proximity probe signal conditioning and 4-20 mA current loop conversion within machinery protection networks.
| Option Code | Option Description | Technical Definition |
|---|---|---|
| 990 | Base Model | 2-Wire Vibration Transmitter |
| -05 | Full-scale Option | 0-5 mils pp (0-125 um pp) full-scale measurement range |
| -50 | System Length Option | 5.0 meters (16.4 feet) total system length |
| -02 | Mounting Option | Bulkhead screws mounting configuration |
| -00 | Agency Approval Option | No hazardous area approvals required |
| Parameter | Specification |
|---|---|
| Model | 990-05-50-02-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Vibration Transmitters |
| Input Device | Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable |
| Full-Scale Range | 0-5 mils pp (0-125 um pp) |
| System Length | 5.0 meters (16.4 feet) |
| Power Supply | +12 to +35 VDC input at the transmitter terminals |
| Output Signal | 4-20 mA DC loop proportional to vibration amplitude |
| Mounting | Bulkhead screws |
| Operating Temp | -35 to +85 deg C (-31 to +185 deg F) |
| Storage Temp | -51 to +100 deg C (-60 to +212 deg F) |
| Dimensions | Standard 990 enclosure profile |
| Weight | 1.5 kg (Shipping Weight) |
| Power Consumption | Loop-powered via +12 to +35 VDC supply circuit |
The transmitter processes raw high-frequency signals generated by a 3300 NSv eddy-current proximity probe across a tuned 5.0-meter total system length. Field commissioning requires gap voltage validation to ensure the probe tip maintains a -10 VDC target bias voltage at physical mid-span, setting the baseline for linear displacement tracking. Accurate eddy-current probe scaling converts dynamic shaft movements within the 0-5 mils pp envelope into a proportional 4-20 mA loop signal for direct integration into monitoring hardware.
Q: What power input voltage is required at the field terminals?
A: The transmitter requires a DC power supply providing between +12 VDC and +35 VDC directly across the field connection terminals to drive the 4-20 mA loop.
Q: Which proximity sensor components must be connected to this transmitter model?
A: The module accepts input from one non-contacting 3300 NSv proximity probe combined with a matching extension cable configured for a 5.0-meter total system length.
Q: How is the physical enclosure secured inside an instrument cabinet?
A: The -02 mounting option provides integrated surface mounting points designed for direct attachment to panels or bulkheads via mounting screws.
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