Product Overview
The Bently Nevada 991-25-50-02-CN is a precision thrust transmitter designed for axial vibration monitoring in rotating machinery. This industrial automation module converts proximity probe signals into a linear 4-20 mA output, enabling seamless integration with PLCs, DCS, and SCADA systems. Ideal for replacing legacy thrust monitoring solutions, the 991-25-50-02-CN offers enhanced accuracy and reliability. Manufactured in the USA, it features a DIN rail mount and accepts one 3300 NSv proximity probe.
Technical Specifications
The Bently Nevada 991-25-50-02-CN delivers robust performance with the following key parameters:
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Full-scale range: 25-0-25 mils (0.6-0-0.6 mm)
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Output signal: 4-20 mA (two-wire)
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Loop accuracy: ±1.5% of full scale (typical)
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Power supply: +12 to +35 Vdc at transmitter
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Maximum loop resistance: 1,000 Ω at 35 Vdc
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Current limiting: 23 mA typical
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Operating temperature: -35°C to +85°C
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Storage temperature: -51°C to +100°C
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Weight: 0.43 kg (0.9 lbm)
Real-World Applications
The Bently Nevada 991-25-50-02-CN is essential for axial position and thrust bearing monitoring in turbines, compressors, and large pumps. In a steam turbine upgrade, replacing older displacement transmitters with the 991-25-50-02-CN improves response time and reduces false trips. Its Non-interacting zero and span adjustments simplify calibration during overhaul. For hydroelectric generators, the 991-25-50-02-CN provides reliable thrust pad wear indication, preventing catastrophic failures.
Maintenance & Reliability
Routine maintenance of the Bently Nevada 991-25-50-02-CN involves checking loop integrity and verifying output against known probe gaps. The transmitter's Not OK/Signal Defeat function forces output below 3.6 mA within 100 µs of a fault, alerting operators immediately. With all solid-state components, the 991-25-50-02-CN offers long service life in harsh environments. Storage between -51°C and +100°C ensures readiness for spares.
Selection Guide & Buying Advice
When selecting the Bently Nevada 991-25-50-02-CN, verify that your proximity probe is a 3300 NSv series. The -50 system length option indicates a 5.0-meter cable; confirm this matches your installation. For bulkhead mounting (Option 02), ensure adequate clearance. The CN agency approval indicates country-specific certifications. For reliable supply, visit ubest101 and search for 991-25-50-02-CN to order genuine Bently Nevada parts.