Overview
Configured for proportional vibration measurement from a 3300 NSv proximity probe, the Bently Nevada 990-05-XX-01-00 MOD:165335-01 (990-05-XX-01-00 Vibration Transmitter) converts peak-to-peak vibration amplitude into a direct 4-20 mA signal for machinery control inputs.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 990-05-XX-01-00 MOD:165335-01 |
| Spare Model | 990-05-XX-01-00 |
| Brand | Bently Nevada |
| Product Type | 990 Vibration Transmitter |
| Origin | USA |
| Shipment Location | Xiamen, China |
| Weight | 0.45 kg |
| Dimensions | 10 x 7.4 x 6 cm estimated shipping size |
| Power Consumption | Two-wire, loop-powered |
| Output Signal | 4-20 mA |
| Full-scale Option | 0-5 mils pp (0-125 um pp) |
| Frequency Response | 5 Hz to 6 kHz, +0 / -3 dB |
| Probe Gap Range | 0.5-1.75 mm / 20-55 mils |
| Prox Out Scale Factor | 7.87 mV/um / 200 mV/mil, +/-10% |
| System Length | 5.0 m / 7.0 m |
| Mounting | 35 mm DIN rail clips |
| Input Device | 3300 NSv proximity probe |
Eddy-Current Probe Scaling and Vibration Signal Conversion
The 990 transmitter accepts the electrical signal from a compatible 3300 NSv proximity probe and matching extension cable. The specified system length options are 5.0 m and 7.0 m.
The transmitter scales the probe signal according to the selected vibration range. For the specified configuration, the full-scale range is 0-5 mils pp (0-125 um pp), while the proximity output scale factor is 7.87 mV/um or 200 mV/mil, with a stated tolerance of +/-10%.
The 0.5-1.75 mm probe gap range corresponds to the specified 20-55 mils mechanical clearance range. Therefore, correct probe positioning directly affects the usable measurement range and signal linearity.
The transmitter provides a proportional 4-20 mA output for connection to a machinery control system. Consequently, the receiving control system can process vibration amplitude for alarming and protection logic.
Frequently Asked Questions (FAQ)
Q: What probe does the 990-05-XX-01-00 MOD:165335-01 accept?
A: It accepts a compatible Bently Nevada 3300 NSv proximity probe with the matching extension cable system.
Q: What signal does the transmitter provide to the control system?
A: The two-wire, loop-powered transmitter provides a proportional 4-20 mA vibration signal.
Q: What is the specified frequency response?
A: The frequency response is 5 Hz to 6 kHz, with a stated tolerance of +0 / -3 dB.
Field Installation Guidelines
- Install the transmitter using the specified 35 mm DIN rail clips and verify mechanical retention before wiring.
- Maintain the specified probe gap of 0.5-1.75 mm during probe installation and shaft-position verification.
- Use the compatible 3300 NSv probe and matching 5.0 m or 7.0 m extension cable system.
- Route the probe signal cable separately from high-current power conductors and switching circuits where practical.
- Follow the receiving control system requirements for 4-20 mA loop wiring, cable shielding, and shield termination.
- Verify loop polarity and signal continuity before commissioning the vibration input.
- Confirm the probe gap and transmitter output at the installed operating position before enabling machinery alarm or protection logic.
- Do not infer an operating-temperature limit or power-consumption value beyond the supplied specification.
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