Bently Nevada 176449-02 3500/42M Proximitor Seismic Monitor

The Bently Nevada 176449-02 3500/42M Proximitor Seismic Monitor is a sophisticated four-channel device designed to protect machinery by continuously comparing monitored parameters against configured alarm setpoints to trigger alarms. It is capable of receiving inputs from proximity and seismic transducers, conditioning these signals to provide vibration and position measurements, and comparing the conditioned signals with user-programmable alarms.

This monitor communicates essential machine information to both operations and maintenance personnel. It supports various monitoring functions including radial vibration, thrust position, acceleration, differential expansion, and more, with each channel being programmable via the 3500 Rack Configuration Software.

Technical Specifications

Inputs

• Signal: Accepts from 1 to 4 proximity, velocity, or acceleration transducer signals.
• Power consumption: 7.7 watts, typical.
• Input Impedance:
  • Standard I/O: 10 kΩ (Proximitor and acceleration inputs).

Sensitivity

• Radial Vibration, Thrust, Eccentricity: 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil).
• Differential Expansion: 0.394 mV/µm (10 mV/mil) or 0.787 mV/µm (20 mV/mil).
• REBAM: 40 mV/µm (1000 mV/mil) or 80 mV/µm (2000 mV/mil).
• Acceleration & Acceleration2: 10 mV/(m/s²) (100 mV/g).
• Velocity & Velocity2: 20 mV/(mm/s) pk (500 mV/(in/s) pk) or 5.8 mV/(mm/s) pk (145 mV/(in/s) pk) or 4 mV/(mm/s) pk (100 mV/(in/s) pk).
• Shaft Absolute, Radial Vibration: 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil).
• Shaft Absolute, Direct: 3.94 mV/µm (100 mV/mil) or 7.87 mV/µm (200 mV/mil).
• Shaft Absolute, Velocity: 20 mV/(mm/s) pk (500 mV/(in/s) pk) or 5.8 mV/(mm/s) pk (145 mV/(in/s) pk) or 4 mV/(mm/s) pk (100 mV/(in/s) pk).

Outputs

• Front Panel LEDs:
  • OK LED: Indicates proper operation.
  • TX/RX LED: Indicates communication with other modules.
  • Bypass LED: Indicates when the monitor is in Bypass Mode.
• Buffered Transducer Outputs: Each channel has one coaxial connector, short-circuit protected.
• Output Impedance: 550 Ω.
• Transducer Power Supply: -24 Vdc.
• Recorder Outputs: +4 to +20 mA, proportional to monitor full-scale, unaffected by short circuits.

Signal Conditioning

• Frequency Response:
  • Direct filter: User-programmable, single-pole, -3 dB at 4 Hz to 4000 Hz or 1 Hz to 600 Hz, ± 1% accuracy.
  • Gap filter: -3 dB at 0.09 Hz.
  • Not 1X filter: 60 cpm to 15.8 times running speed, constant Q notch filter, minimum rejection of -34.9 dB.
  • Smax: 0.125 to 15.8 times running speed.
  • 1X and 2X vector filter: Constant Q filter, minimum rejection of -57.7 dB.

Environmental Limits

• Operating Temperature:
  • With Internal/External Termination I/O Module: -30°C to +65°C (-22°F to +150°F).
  • With Internal Barrier I/O Module: 0°C to +65°C (32°F to +150°F).
• Storage Temperature: -40°C to +85°C (-40°F to +185°F).
• Humidity: 95%, non-condensing.

Physical Specifications

• Monitor Module (Main Board) Dimensions: 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in).
• Weight: 0.91 kg (2.0 lb).
• I/O Modules (non-barrier) Dimensions: 241.3 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in).
• Weight: 0.20 kg (0.44 lb).
• I/O Modules (barrier) Dimensions: 241.3 mm x 24.4 mm x 163.1 mm (9.50 in x 0.96 in x 6.42 in).
• Weight: 0.46 kg (1.01 lb).