Bently Nevada 990-05-70-02-00 Vibration Transmitter 0-5 Mils Range

Technical Overview: 990-05-70-02-00 Transmitter

The 990-05-70-02-00 is a precision-engineered 2-wire vibration transmitter from the Bently Nevada 990 series. It is designed to interface directly with 3300 NSv proximity probes, converting displacement data into a standard 4-20 mA industrial signal. This loop-powered device is optimized for balance-of-plant machinery where cost-effective, reliable monitoring is required without the complexity of full rack-based protection systems.

Configuration Breakdown

• 990 - Series: 990 Vibration Transmitter
• 05 - Full-scale Option: 0-5 mils pp (0-125 μm pp)
• 70 - System Length Option: 7.0 meters (23.0 feet)
• 02 - Mounting Option: Bulkhead screws
• 00 - Agency Approval: Not required

Key Performance Metrics

• Output: 4-20 mAdc (2-wire configuration).
• Frequency Response: 5 Hz to 6,000 Hz (+0, -3 dB).
• Power Requirement: +12 to +35 Vdc input.
• Loop Integrity: 1,000 Ω max resistance at 35 Vdc.
• Failure Mode: Signal drops to < 3.6 mA upon "Not OK" detection (100 µs response).

Comparison & Technical Selection Guide

Choosing between the 990-05-70-02-00 and the 990-10-70-03-CN depends on your machine's mechanical threshold:

• Range Sensitivity: The 990-05-70-02-00 (0-5 mils) is ideal for high-precision monitoring of machinery with low vibration tolerance. The 990-10-70-03-CN (0-10 mils) is better suited for standard industrial pumps and motors with higher amplitude baselines.
• Mounting Considerations: The 02 mounting (bulkhead) versus the 03 mounting (DIN rail/other) must align with your existing cabinet infrastructure.
• Technical Advice: Always ensure the probe gap is set to 0.5-1.75 mm. Using the wrong range setting will lead to signal clipping or insufficient resolution for your SCADA system.

Global PLC Spare HUB's Insight

The 990-05-70-02-00 is highly effective for critical balance-of-plant assets. Its diagnostic capability is excellent—it automatically reports a "Not OK" status by driving the loop below 3.6 mA, effectively signaling a sensor or cable failure to your PLC/DCS. When implementing, prioritize clean wiring to minimize EMI, as this device relies on sensitive proximity probe signal processing.

Logistics and Warranty

• Warranty: Protected by a 12-month quality assurance warranty.
• Fulfillment: Rapid 24-48 hour dispatch.
• Shipping: Secure global transit via FedEx, UPS, and DHL.

Expert FAQ

What is the typical use case for a 0-5 mils range transmitter?
This range is specifically chosen for equipment requiring sensitive vibration detection, such as high-speed gearboxes or precision rotating shafts where small deviations indicate imminent wear.

Can I use this with any proximity probe?
No, the 990 series is strictly calibrated for the Bently Nevada 3300 NSv proximity probe system. Mismatched probes will yield incorrect output and void safety compliance.

How can I diagnose a "Not OK" condition remotely?
Monitor the 4-20 mA loop current; if it drops below 3.6 mA, the transmitter has detected a fault in the probe, extension cable, or internal circuitry.

Is the probe gap critical for accuracy?
Absolutely. If the gap is outside the 0.5-1.75 mm range, the transmitter's linear response is compromised, and the output signal will not represent the true vibration amplitude.

Selection Tip: How do I choose between different system lengths?
The system length must match your probe-to-transmitter cable run. Incorrect cable lengths introduce signal attenuation, which negatively impacts the calibration of the 4-20 mA output.

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