Bently 3500/70M Reciprocating Compressor Impulse

Technical Specifications

• Channels: 4-channel configuration, supporting dual-channel redundancy when paired with another 3500/70M module.
• Input Signal Range:
  • Non-isolated I/O: -0.8 V to -21.0 V
  • Isolated I/O: +5 V to -11 V
• Minimum Shaft Speed:
  • Passive electromagnetic sensors: >200 RPM (3.3 Hz)
  • Active proximity sensors: No minimum speed restriction
• Auto Threshold: Minimum trigger signal amplitude of 2 V peak-to-peak at frequencies ≥120 RPM (2 Hz).
• Manual Threshold: Adjustable from 0.017 Hz (1 RPM) with a minimum input range of 0–20 Vdc and trigger amplitude of 500 mV peak-to-peak.
• Hysteresis: Adjustable from 0.2 to 2.5 V.
• Output Signals: Buffered Keyphasor outputs on front panel (coaxial connectors) and rear panel (Euro-style connectors).
• Power Supply: 24 V DC.
• Operating Temperature: -40°C to +85°C.
• Storage Temperature: -55°C to +121°C.
• Environmental Humidity: 5% to 95% relative humidity (non-condensing).
• Weight: Approximately 0.8 kg.
• Dimensions: 127 mm × 127 mm × 254 mm.
• Protection Class: IP65.

Functional Characteristics

• Dual-Channel Design: Each module accepts inputs from two sensors, enabling redundant monitoring when two modules are installed.
• Signal Processing: Features user-programmable direct filters, gap filters, and 1x/2x vector filters for high-precision measurements.
• Alarm Functionality: Triggers alarms when monitored parameters exceed preset thresholds, supporting automatic shutdown and fault notification.
• Modular Architecture: Field-upgradable firmware and modular design simplify installation, maintenance, and system upgrades.
• LED Indicators:
  • OK LED: Indicates module health and fault detection.
  • TX/RX LED: Flashes during communication with the framework interface module (RIM).

Application Scenarios

• Power Generation: Monitors vibrations in turbines, generators, and pumps to ensure reliable operation.
• Oil and Gas: Protects compressors, expanders, and pumps in refineries and offshore platforms from mechanical failures.
• Petrochemical: Safeguards critical machinery in chemical processing plants, including reactors and distillation columns.
• Metallurgy: Monitors rolling mills, fans, and other equipment in steel plants to prevent unplanned downtime.
• Pulp and Paper: Ensures stable operation of paper machines and fans by detecting abnormal vibrations.

Key Advantages

• High Precision: Delivers accurate velocity and impulse measurements for early fault detection.
• Wide Measurement Range: Adapts to varying rotational speeds, supporting diverse industrial applications.
• Flexible Sensor Inputs: Compatible with magnetic and eddy-current sensors, enhancing system versatility.
• Robust Design: Withstands harsh industrial environments with high resistance to vibration, temperature extremes, and electromagnetic interference.
• Seamless Integration: Works with other 3500 series modules to provide a comprehensive machinery protection and monitoring solution.