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Bently 3500/25 Enhanced Keyphasor Module
Technical Specifications:
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Channels: 2 (expandable to 8 in paired configuration)
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Input Types: Eddy-current probes, magnetic pickups, optical sensors
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Input Range:
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Non-isolated I/O: +0.8 V to –21 V
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Isolated I/O: +5 V to –11 V
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Passive mag pickup: >200 rpm (3.3 Hz) minimum
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Frequency Range: 0.017 – 19,999 RPM
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Accuracy: ±0.05 % of reading
Detailed content
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Resolution: 0.1 RPM
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Output: TTL/CMOS Keyphasor pulses, 50 Ω max impedance
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Sampling Rate: 1 kHz per channel
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Power: 24 VDC from rack, 3.2 W max
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Operating Temperature: –30 °C to +65 °C
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Storage Temperature: –40 °C to +85 °C
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Humidity: 5 % – 95 % RH non-condensing
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Dimensions: 241 × 24 × 99 mm (full-height slot)
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Weight: 0.5 kg
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Agency Approvals: CE, UL, ATEX Zone 2, SIL 2 capable
Functional Features:
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Auto-trigger level finds optimum threshold for noisy signals
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Front BNC for oscilloscope phase verification
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Redundant Keyphasor outputs for dual-monitor racks
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Programmable multiplier/divider for gear ratio correction
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Firmware flash without rack shutdown
Application Scenarios:
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Steam-turbine phase reference for balancing
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Compressor speed tracking for surge detection
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Motor vector trending for pole-slip identification
