Product Introduction
The Bently Nevada 990-08-70-01-00 is a 990 Vibration Transmitter engineered for continuous machine condition monitoring. As part of the Bently Nevada family, this Industrial Automation Module converts dynamic vibration from a non-contacting 3300 NSv Proximity Probe into a proportional 4-20 mA signal. Its robust design supports predictive maintenance programs, reducing unplanned downtime and extending equipment life.
Technical Specifications Breakdown
The Bently Nevada 990-08-70-01-00 delivers key performance parameters drawn directly from its specification sheet:
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Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
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Power: Requires +12 to +35 Vdc input at the transmitter terminal.
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4 to 20 mA Loop Accuracy: Within ±1.5% over the specified full-scale range (rated from TEST signal input to voltage across a 250 Ω loop).
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Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc.
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Current Limiting: 23 mA typical.
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Frequency Response: 5 Hz to 6,000 Hz +0, 3 dB.
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Power Supply (Hazardous Areas): 28 V for Non-Hazardous, Zone 2 or Div 2 locations.
These specifications ensure reliable, accurate vibration data acquisition for critical rotating machinery.
Industry Applications
The Bently Nevada 990-08-70-01-00 excels in applications requiring precise vibration monitoring. Common use cases include compressors, turbines, pumps, and fans in oil & gas, power generation, and manufacturing. Its 4-20 mA output integrates directly with PLCs (e.g., Allen-Bradley, Siemens) to trigger alarms or automated shutdowns, preventing catastrophic failures. The transmitter’s full-scale range of 0-8 mils pp (0-200 μm pp) suits most industrial rotating equipment.
Installation & Setup Guidance
Mount the Bently Nevada 990-08-70-01-00 using the provided 35 mm DIN rail clips (Mounting Option 01). The system length is 7.0 meters (23.0 feet), so install the transmitter within that distance from the probe tip. Power the unit with +12 to +35 Vdc applied at the transmitter terminal. Gap the 3300 NSv probe between 0.5 and 1.75 mm (20 and 55 mils) from the target to ensure full-scale range operation. Non-interacting external zero and span adjustments simplify calibration.
Troubleshooting & Common Issues
If the Bently Nevada 990-08-70-01-00 output goes below 3.6 mA, a Not OK condition exists. The signal returns within 2–3 seconds after the condition clears. Check probe gap and power supply voltage to verify compliance with +12 to +35 Vdc. For loop resistance exceeding 1,000 Ω, reduce cable length or increase supply voltage. Frequency response anomalies may indicate probe or cable faults; maximum leadwire length from Proximitor to BNC is 3 meters (10 feet).
Selection Guide & Purchasing Advice
When ordering the Bently Nevada 990-08-70-01-00, confirm your full-scale range (Option 08), system length (Option 70), mounting (Option 01), and agency approval (Option 00). Ensure your system requires a 2-wire 4-20 mA output and that the target size is at least 9.5 mm (0.375 in) diameter. For reliable sourcing, PLC Source PRO (available through ubest101) offers genuine Bently Nevada modules with fast delivery.