Overview
It converts proximity probe signals into a stable 4–20 mA output, therefore simplifying vibration integration into control systems.
Moreover, this transmitter supports continuous condition monitoring in harsh industrial environments with minimal configuration effort.
Designed for industrial engineers, the 990 series balances accuracy, durability, and straightforward loop-powered installation.
For instance, users can deploy it directly into PLC or DCS loops without additional signal conditioning hardware.
Specification
| Specification | Details |
|---|---|
| Model Number | 990-05-50-02-01 |
| Product Type | Vibration Transmitter, 2-wire loop-powered |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Measured Parameter | Shaft vibration, peak-to-peak displacement |
| Input Sensor | One non-contacting proximity probe with extension cable |
| Output Signal | 4–20 mA proportional to vibration level |
| Power Supply | Loop-powered, 12 to 35 V DC |
| Loop Accuracy | ±1.5% of full-scale output |
| Maximum Loop Resistance | Up to 1,000 Ω at 35 V DC |
| Current Limiting | Approximately 23 mA |
| Zero / Span Adjustment | External, non-interacting potentiometers |
| Fault Indication (NOT OK) | Output drops below 3.6 mA during detected fault |
| Fault Recovery Time | Approximately 2–3 seconds after fault clearance |
| Power-up Inhibit | Output held below 3.6 mA during startup delay |
| Frequency Response | Approximately 5 Hz to 6,000 Hz (±3 dB) |
| Operating Temperature | –35°C to +85°C (–31°F to +185°F) |
| Storage Temperature | –51°C to +100°C (–60°F to +212°F) |
| Humidity Rating | 5–95% non-condensing |
| Mounting Method | DIN rail mounting or bulkhead screws |
| Housing | Rugged industrial enclosure |
| Compliance | CE and regional approvals, market dependent |
| Full-scale Option | 0–5 mils pp (0–125 μm pp) |
| System Length Option | 5.0 meters (16.4 feet) |
| Agency Approval Option | CSA Division 2 |
FAQ
A1: It measures peak-to-peak shaft vibration displacement using a non-contacting proximity probe.
Q2: Does the transmitter require an external power supply?
A2: No, it operates as a two-wire loop-powered device using 12 to 35 V DC.
Q3: Can it connect directly to a PLC or DCS analog input?
A3: Yes, the 4–20 mA output connects directly to standard control system inputs.
Q4: How does the NOT OK function improve reliability?
A4: It forces the output below 3.6 mA during faults, enabling immediate fault detection.
Q5: Is field calibration possible without removing the unit?
A5: Yes, external zero and span potentiometers support on-site calibration.
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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