Overview
In addition, installation is simplified with DIN-rail clips or bulkhead mounting options. The 990 series ensures consistent performance across a wide frequency range, stable temperature conditions, and various hazardous or non-hazardous locations. With proven reliability, it supports rapid commissioning, long-term maintenance efficiency, and accurate signal conditioning.
Specification
| Parameter | Specification |
|---|---|
| Input Signal | 1 non-contacting 3300 NSv Proximity Probe with extension cable |
| Power Supply | +12 to +35 Vdc |
| Output Signal | 4–20 mA proportional, loop-powered |
| Loop Accuracy | ±1.5% over full-scale range |
| Maximum Loop Resistance | 1,000 Ω including cable at 35 Vdc |
| Zero and Span Adjustment | Non-interacting potentiometers |
| NOT OK/Signal Defeat | Output < 3.6 mA within 100 µs; restores within 2–3 seconds |
| Prox Out Output Impedance | 10 kΩ calibrated for 10 MΩ load |
| Prox Out Linear Range | 1.4 mm (55 mils) beginning ~0.25 mm (10 mils) from target |
| Incremental Scale Factor | 7.87 mV/µm (200 mV/mil) ±6.5% typical |
| Temperature Stability | ±10% of scale factor, 0°C – 70°C (32°F – 158°F) |
| Frequency Response | 5 Hz – 6,000 Hz +0, -3 dB |
| Minimum Target Size | 9.5 mm (0.375 in) diameter |
| Leadwire Length | Maximum 3 m (10 ft) for Proximitor Sensor BNC connector |
| Mounting Options | DIN-rail clips or bulkhead screws |
| Hazardous Area Rating | Non-Hazardous, Zone 2 / Div 2 |
Ordering Information
| Parameter | Specification |
|---|---|
| Full-scale Option | 0–10 mils pp (0–250 μm pp) |
| Mounting Option | Bulkhead screws |
| Agency Approval Option | Not required |
FAQ
A: The 990 transmitter is compatible with all Bently Nevada 3300 NSv proximity probes and extension cables.Q: How does the Not OK/Signal Defeat feature work?
A: It forces the output below 3.6 mA in case of a faulty probe or loose connection, preventing false alarms.
Q: Can this transmitter be used in hazardous areas?
A: Yes, it is rated for non-hazardous, Zone 2, or Div 2 hazardous locations.
Q: What is the maximum cable distance for the diagnostic output?
A: The Proximitor Sensor BNC connector supports a maximum lead length of 3 meters (10 feet).
Q: How accurate is the 4–20 mA output signal?
A: The loop signal is accurate within ±1.5% over the specified full-scale range.
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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