Product Introduction
Efficient Machinery Protection in a Compact Industrial Package
The 990-04-70-01-00 simplifies vibration monitoring by integrating Proximitor® signal conditioning electronics into a compact transmitter housing. Instead of requiring a separate proximity signal conditioner, this device directly interfaces with a compatible 3300 NSv proximity probe system and provides a process-ready 4–20 mA output.
The 122115-01 test adapter included with this configuration improves troubleshooting convenience by isolating test equipment from the transmitter output circuit, helping technicians safely verify operating conditions during commissioning and maintenance activities.
Designed for panel and machinery package installations, the 990 series offers a practical solution where space limitations, simple wiring, and continuous vibration monitoring are important considerations.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 990-04-70-01-00 |
| Associated Accessory | 122115-01 Test Adapter |
| Product Type | 990 Vibration Transmitter |
| Measurement Range | 0–4 mils peak-to-peak (0–100 μm pp) |
| Output Signal | 4–20 mA Proportional Vibration Output |
| Power Supply | +12 to +35 VDC |
| Input Sensor | 3300 NSv Non-Contacting Proximity Probe |
| System Length | 7.0 m (23 ft) |
| Mounting Method | 35 mm DIN Rail Clips |
| Agency Approval | No Approval Required |
| Signal Type | Peak-to-Peak Vibration Amplitude |
| Frequency Response | 5 Hz to 6 kHz |
| Operating Temperature | -35°C to +85°C (-31°F to +185°F) |
| Storage Temperature | -51°C to +100°C (-60°F to +212°F) |
| Housing Construction | Industrial Potted Electronics |
| Approximate Dimensions | 100 × 74 × 53 mm |
| Approximate Weight | 0.43–0.54 kg |
Industrial Applications
The Bently Nevada 990-04-70-01-00 is designed for continuous monitoring of rotating machinery where vibration information is required for operational protection and predictive maintenance.
| Industry | Typical Equipment |
|---|
| Power Generation | Small turbines, generators, auxiliary equipment |
| Oil & Gas | Centrifugal compressors, pumps |
| Petrochemical | Process rotating machinery |
| Manufacturing | Motors, fans, blowers |
| Water Treatment | Pump systems |
| OEM Machinery Packages | Compressor and pump skids |
Typical applications include:
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Shaft vibration monitoring
-
Machinery condition monitoring
-
PLC/DCS vibration input
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Alarm and shutdown protection
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Predictive maintenance systems
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Rotating equipment diagnostics
Product Advantages
Integrated Proximitor® Signal Conditioning
The transmitter combines vibration signal conditioning and conversion electronics into one compact unit, reducing installation complexity and eliminating the need for a separate external Proximitor module.
Standard 4–20 mA Industrial Output
The universal 4–20 mA signal allows direct connection to plant control systems, making integration simple for OEM packages and existing automation networks.
Compatible with 3300 NSv Probe Systems
The transmitter is designed specifically for use with 3300 NSv proximity probes and extension cables, providing accurate non-contact shaft vibration measurement in limited-space installations.
Space-Saving DIN Rail Installation
The 35 mm DIN rail mounting design allows easy installation inside control cabinets, reducing panel space requirements.
Convenient Maintenance Testing
The included 122115-01 test adapter supports safer diagnostic testing by providing signal isolation when using grounded test instruments.
Rugged Industrial Reliability
The fully enclosed construction provides resistance against vibration, humidity, and industrial contaminants, supporting long-term operation in demanding environments.
Technical FAQs
1. What is the Bently Nevada 990-04-70-01-00 used for?
It is used to convert shaft vibration measurements from a 3300 NSv proximity probe system into a standard 4–20 mA signal for industrial monitoring and control systems.
2. What does the "04" option mean?
The 04 option indicates a vibration measurement range of 0–4 mils peak-to-peak (0–100 μm pp).
3. What does the "70" option specify?
The 70 option indicates compatibility with a 7.0-meter transducer system length.
4. What is the function of the 122115-01 adapter?
The 122115-01 test adapter provides signal isolation when using grounded AC-powered test equipment for troubleshooting and verification.
5. Which probe is compatible with this transmitter?
The transmitter is designed for use with a Bently Nevada 3300 NSv proximity probe and matching extension cable.
6. Does this transmitter require an external Proximitor sensor?
No. The 990 transmitter includes integrated Proximitor® electronics, reducing the need for separate signal-conditioning hardware.
7. What power supply does the unit require?
It requires a +12 to +35 VDC power supply at the transmitter terminals.
8. Can it connect directly to a PLC?
Yes. The 4–20 mA output is designed for direct connection to PLC, DCS, and SCADA systems.
9. Why is maintaining the correct system length important?
The probe and extension cable length form part of the calibrated proximity measurement system, so the specified 7-meter configuration should be maintained for accurate readings.
10. What machines commonly use the 990 transmitter?
It is commonly used on centrifugal compressors, pumps, motors, fans, and OEM rotating equipment packages requiring continuous vibration monitoring.
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