Overview
It converts proximity probe signals into a stable 4–20 mA output for direct connection to control systems.
Moreover, this transmitter supports continuous machine protection while reducing system complexity and installation effort.
Engineers commonly select this model when cost-effective vibration monitoring is required without sacrificing measurement integrity.
Specification
| Specification | Details |
|---|---|
| Model Number | 990-04-70-02-00 |
| 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 current loop 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 (including cable) |
| Current Limiting | Approximately 23 mA |
| Zero Adjustment | External potentiometer, non-interacting |
| Span Adjustment | External potentiometer, non-interacting |
| Fault Output (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 |
| Housing Design | Rugged industrial enclosure |
| Compliance | CE and regional safety approvals (market dependent) |
| Full-scale Range Option | 0–4 mils peak-to-peak (0–100 μm peak-to-peak) |
| System Length Option | 7.0 meters (23.0 feet) |
| Mounting Option Code | 02 |
FAQ
A1: It converts proximity probe vibration signals into a 4–20 mA output for monitoring and control systems.
Q2: Is this transmitter suitable for continuous operation?
A2: Yes, it is designed for continuous industrial service under harsh environmental conditions.
Q3: Does the unit require an external power supply?
A3: No, it operates as a loop-powered device using the 4–20 mA current loop.
Q4: Can technicians adjust calibration in the field?
A4: Yes, external zero and span controls allow simple and accurate field calibration.
Q5: What happens if the probe signal fails?
A5: The output drops below 3.6 mA, allowing the control system to detect a fault condition.
Q6: Which systems can accept the transmitter output?
A6: Any PLC, DCS, or monitoring system with a standard 4–20 mA analog input.
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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