Overview
The 990 Vibration Transmitter primarily targets original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, and fans. Therefore, it enables them to provide a simple 4–20 mA proportional vibration signal directly to their machinery control system, simplifying integration while maintaining high measurement reliability.
Specification
| Parameter | Specification |
|---|---|
| Model | 990-05-XX Vibration Transmitter |
| Input Type | Accepts one non-contacting 3300 NSv Proximity Probe and matching extension cable |
| Power Supply | +12 to +35 V DC (2-wire loop powered) |
| Output Signal | 4–20 mA DC proportional to vibration amplitude |
| Full-Scale Options | 04: 0–4 mils pp (0–100 µm pp) / 05: 0–5 mils pp (0–125 µm pp) |
| Loop Accuracy | ±1.5% over specified full-scale range |
| Maximum Loop Resistance | 1,000 Ω including cable at 35 V DC |
| Current Limiting | 23 mA typical |
| Recommended Probe Gap | 0.5 – 1.75 mm (20 – 55 mils) from target |
| Frequency Response | 5 Hz – 6,000 Hz (+0, –3 dB) |
| Incremental Scale Factor | 7.87 mV/µm (200 mV/mil) ±6.5% typical |
| Linear Range | 1.4 mm (55 mils) |
| Temperature Stability | ±10% of scale factor from 0°C to +70°C (+32°F to +158°F) |
| PROX OUT Output Impedance | 10 kΩ (calibrated for 10 MΩ load) |
| PROX OUT Noise Level | 50 mV peak-to-peak typical |
| Test Input | Accepts function generator signal for loop verification |
| Not OK / Signal Defeat | Output <3.6 mA within 100 µs of fault; restores in 2–3 s |
| Power-Up Inhibit | Output <3.6 mA for 2–3 s after power-up |
| Operating Temperature | 0°C to +70°C (+32°F to +158°F) |
| Target Material | AISI 4140 steel |
| Minimum Target Size | 9.5 mm (0.375 inch) diameter |
| Mounting Options | DIN-rail clips or bulkhead screws |
| Maximum BNC Cable Length | 3 meters (10 feet) |
| Area Compatibility | Suitable for Non-Hazardous, Zone 2, or Division 2 areas |
FAQ
A1: It is designed for use with the 3300 NSv proximity probe and its matching extension cable.
Q2: Can the transmitter be used in hazardous areas?
A2: Yes, it is approved for Non-Hazardous and Zone 2 / Division 2 hazardous environments.
Q3: How is vibration measured and transmitted?
A3: The transmitter converts proximity probe signals into a 4–20 mA output proportional to vibration amplitude.
Q4: What happens during a probe failure?
A4: The “Not OK/Signal Defeat” circuit forces the loop output below 3.6 mA to indicate a fault.
Q5: Does it provide raw vibration data for analysis?
A5: Yes, the PROX OUT terminal and BNC connector allow direct connection to portable analyzers.
Manual/Datasheet PDF
Bently Nevada Top Products
| 3500 | 3300 | Probe&Cable |
| 3500/05-01-01-00-00-00 | 3300/05-22-00-00 | 990-04-70-01-00 |
| 3500/05-01-01-05-00-01 | 3300/05-24-00-00 | 990-04-70-02-00 |
| 3500/05-01-02-05-00-01 | 3300/45-02-01-03-00 | 990-04-XX-01-00 |
| 3500/05-01-03-05-00-01 | 3300/45-02-02-03-00 | 990-04-XX-03-00 |
| 3500/05-02-04-00-00-00 | 3300/48-01-01-01-00 | 990-05-50-02-01 |
| 3500/05-02-04-00-00-01 | 3300/48-02-01-00-00 | 990-05-70-01-00 |
| 3500/05-02-05-00-00-00 | 3300/50-01-01-00-00 | 990-05-70-01-01 |
| 3500/05-02-05-00-00-01 | 3300/50-02-01-00-00 | 990-05-70-02-00 |
| 3500/20 125744-02 | 3300/20-13-02-01-00-00 | 990-05-70-03-00 |
| 3500/22 125768-01 | 3300/40-13-01-01-00-00 | 990-05-XX-03-05 |
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