Bently Nevada 991-25-50-03-05 Loop-Powered Thrust Transmitter

Description

The 991-25-50-03-05 is a loop-powered thrust transmitter from Bently Nevada, tailored for OEMs of compressors, pumps, and motors. It converts axial shaft displacement into a 4–20 mA signal for integration with control systems, enabling real-time machinery protection and diagnostics.

Specifications

• Model: 991-25-50-03-05

• Measurement Range: ±0.6 mm (±25 mils)

• System Length: 5.0 meters (probe + extension cable)

• Mounting Option: DIN rail clips and screws

• Power Supply: +12 to +35 VDC (2-wire loop-powered)

• Signal Output: 4–20 mA proportional to axial position

• Accuracy: ±1.5% of full scale

• Max Loop Resistance: 1,000 Ω at 35 VDC

• Fault Response Time: <100 μs (signal drop), recovery <0.1 s

• Operating Temperature: –35°C to +85°C

• Storage Temperature: –51°C to +100°C

• Humidity: 100% condensing

• Weight: Approx. 0.43 kg

• Certifications: CSA Div 2, ATEX Zone 0/2, ABS marine approval

• Compatible Probe: 3300 NSv proximity probe

• Connector Type: Miniature coaxial ClickLoc with protector

Features

• Integrated Proximitor Sensor: Eliminates need for external signal conditioning

• Dynamic Signal Output: “PROX OUT” terminal provides real-time vibration and gap voltage for diagnostics

• Zero & Span Adjustments: Non-interacting potentiometers for loop calibration

• Signal Defeat Circuit: Prevents false alarms from probe faults or loose connections

• Power-Up Inhibit: Protects against transient errors during startup

• Compact & Rugged Design: Potted construction for high-humidity environments

• Flexible Mounting: DIN rail or bulkhead installation options

• Wide Application Range: Ideal for compressors, turbines, and small rotating machinery