Bently Nevada|3500/70M 136449-09|Recip Impulse Velocity Monitor

Bently Nevada 3500/70M 136449-09 Recip Impulse Velocity Monitor

The Bently Nevada 3500/70M is a 4-channel monitor designed for the protection of reciprocating compressors by measuring crankcase and crosshead vibrations.

Features

• Supports four functions: Impulse Acceleration, Acceleration 2, Recip Velocity, Low Frequency Recip Velocity
• Channels are configurable in pairs to allow two simultaneous functions
• Provides machinery protection and operational data through static values and alarm comparisons

Technical Specifications

Inputs

• Signal Types: 1–4 proximity probe inputs
• Impedance: 10 kΩ (acceleration), >1 MΩ (velocity)
• Special Inhibit: 5 Vdc @ 390 μA

Power

• Consumption: 7.7 W (nominal)

Sensitivity

• Impulse/Acceleration 2: 0.51–11.72 mV/(m/s²) or 5–115 mV/g
• Recip Velocity/LF Recip Velocity: 3.54–22.64 mV/(mm/s) or 90–575 mV/(in/s)

Outputs

• Transducer Power: -22 Vdc (min), 40 mA (max)
• Recorder Outputs: 4–20 mA, ±0.05 mA accuracy, 600 Ω max load

Signal Conditioning

• Accuracy: ±0.33% typical, ±1% maximum excluding filters
• Frequency Response
  • High-pass: 3–3000 Hz (Impulse/Acceleration 2), 1–400 Hz (Recip Velocity)
  • Low-pass: 30–30k Hz (Impulse/Acceleration 2), 40–5500 Hz (Recip Velocity)

Alarms

• Setpoints: 0–100% of full-scale, ±0.13% accuracy
• Delays: 1–60 sec (Alert), 0.1–60 sec (Danger)

Physical

• Dimensions: 241.3 × 24.4 × 241.8 mm (monitor)
• Weight: 0.91 kg (monitor), 0.20–0.46 kg (I/O modules)

Environmental

• Operating Temp: -30°C to +65°C (standard), 0°C to +65°C (barrier modules)
• Storage Temp: -40°C to +85°C
• Humidity: 95% non-condensing