Product Description
Overview
The Bently Nevada 990-05-70-01-01 is a compact, loop-powered vibration transmitter designed for continuous condition monitoring of small and medium rotating machinery. It integrates a proximity probe interface and converts vibration amplitude into a standard 4_20 mA output compatible with DCS, PLC, SCADA, and industrial control systems.
This transmitter is engineered for harsh industrial environments, offering sealed construction, wide temperature tolerance, and the ability to operate reliably in high-humidity and condensation-prone areas. With adjustable zero and span, built-in fault detection, and flexible mounting options, the 990 series provides a cost-effective way to monitor vibration trends without requiring a full protection system.
Key Features
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2-wire loop-powered design_for simple installation and reduced wiring
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Standard 4_20 mA output_proportional to vibration amplitude
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Compatible with Bently Nevada proximity probes_(typically 3300 NSv)
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Adjustable Zero and Span_for on-site calibration and scaling
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Rugged potted construction_for high-moisture and condensing environments
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Built-in __ot OK / Signal Defeat_ detection_to avoid false alarms from probe faults
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DIN-rail or panel mounting_for flexible installation
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Dynamic __ROX OUT_ signal_available for diagnostic instruments
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Stable performance in electrically noisy industrial zones
Technical Specifications
Electrical
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Power Supply: 18_30 VDC (2-wire loop-powered)
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Output Signal: 4_20 mA proportional to vibration amplitude
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Frequency Response: Approx. 10 Hz to 1 kHz (-3 dB)
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Probe Compatibility: Bently Nevada proximity probes (NSv type)
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Loop Load: Up to approximately 1000 Ω depending on supply voltage
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Fault Detection: __ot OK / Signal Defeat_ circuitry
Measurement
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Full-Scale Range: 0_5 mil peak-to-peak (model code _05_)
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Accuracy: ±5% typical
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Adjustable Parameters: External Zero and Span potentiometers
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Dynamic Output: Coaxial __ROX OUT_ for waveform analysis
Environmental
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Operating Temperature: _40°C to +85°C
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Humidity: Operates in 100% condensing environments
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Construction: Fully sealed / potted for field durability
Physical
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Mounting Options:
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35 mm DIN-rail
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Panel mount with screws
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Approx. Weight: 0.4_0.45 kg
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Connections: Terminal block + coax output
Model Code Breakdown (990-05-70-01-01)
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990__ Vibration Transmitter Series
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05__ 0_5 mil peak-to-peak full-scale measurement
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70__ Probe system length (typically 7.0 m probe + extension cable)
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01__ DIN-rail mounting option
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01__ Regional/approval option
Applications
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Pumps and small compressors
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Industrial fans and blowers
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Electric motors
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Light and medium rotating machinery
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Water treatment plants
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Petrochemical and refinery equipment
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General machine condition monitoring
The 990 series is ideal for facilities seeking a simple, reliable, low-cost way to trend vibration levels without installing a full protection system.
Benefits for Plant Operators
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Continuous monitoring helps detect mechanical problems early
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Works directly with PLC and DCS systems
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Reduces downtime and maintenance costs
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Simple integration into existing control loops
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Provides both trending (4_20 mA) and diagnostic (dynamic output) data
Ordering Information
To order, specify the full model number:
990-05-70-01-01
Includes transmitter module with mounting option and system length.
Compatible accessories include proximity probes, extension cables, and mounting brackets.
Why Choose the Bently Nevada 990 Series
The 990 series is widely used in global industrial facilities because it provides a reliable vibration measurement solution with minimal installation effort. It serves as a bridge between basic condition monitoring loops and more advanced systems, offering an excellent balance between simplicity, performance, and cost.
Request a Quote
Contact us for:
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Pricing and lead time
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Stock availability
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Technical specifications
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Probe and cable configuration assistance
We provide fast response and global shipping.
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