The Bently Nevada 991-06-70-02-01 is a loop-powered thrust transmitter engineered for axial position monitoring in rotating machinery. It integrates Proximitor® signal conditioning and outputs a standard 4–20 mA signal proportional to shaft thrust position. This compact unit simplifies system integration by eliminating the need for separate preprocessor modules.
Designed primarily for centrifugal compressors, pumps, and turbines, the transmitter supports direct connection to 3300 NSv proximity probes with 5 m or 7 m cable lengths. Its two-wire design reduces wiring complexity while maintaining high measurement accuracy under demanding industrial conditions.
Key Technical Specifications
- Model Number: 991-06-70-02-01
- Product Type: Thrust Position Transmitter (part of 990 Vibration Transmitter family)
- Manufacturer: Bently Nevada (a Baker Hughes company)
- Output Signal: 4–20 mA, two-wire loop powered
- Input Compatibility: 3300 NSv 8 mm proximity probes (5 m or 7 m configurations)
- Power Supply: 12–30 VDC loop-powered
- Mounting Options: DIN rail (with optional clip) or bulkhead mount
- Enclosure Protection: Fully potted electronics for operation in 100% condensing environments
- Calibration: Independent zero and span potentiometers (non-interacting)
- Diagnostics: Built-in test input pin for signal verification
- Protection Features: Power-up inhibit and Signal Defeat circuitry to suppress false alarms
- Dimensions: 100 × 73 × 60 mm (L × W × H)
- Weight: 0.5 kg
- Operating Temperature: –40°C to +85°C
- Approvals: CSA, ATEX (when installed per guidelines)
- Country of Origin: USA
- Status: Active product, not discontinued
- Minimum Order Quantity: 1 unit
- HS Code: 8537101190
Typical Applications
This transmitter excels in space-constrained installations where precise axial shaft position data is critical. Common use cases include thrust bearing monitoring in oil & gas compressors, steam turbine differential expansion tracking, and pump shaft positioning in power generation. Its robust design ensures reliable performance in high-humidity, high-vibration, and electrically noisy environments.
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