Description
3500/25-01-01-00 149369-01: Product Overview
This device is a Keyphasor module within the 3500 Monitoring System, designed to provide precise phase reference and shaft speed signals for rotating machinery. In an automation system, it serves as the primary interface for phase reference sensors (e.g., magnetic pickups, eddy current proximity probes), converting raw sensor pulses into synchronized digital outputs for machinery protection and vibration analysis systems (DCS/SIS). The 3500 framework is valued for its modularity and reliability, and this module enhances it by enabling accurate alignment of vibration data (e.g., FFT plots) with shaft position—critical for diagnosing imbalance, misalignment, or bearing faults. It supports 2 independent channels for redundant monitoring of critical assets, with outputs compatible with 3500/42M vibration monitors and 3500/92 communication gateways. The 01-01-00 configuration denotes base functionality for standard industrial applications, while the 149369-01 firmware variant improves phase tracking accuracy for rotor dynamics studies.
Bently 3500/25-01-01-00 149369-01
3500/25-01-01-00 149369-01: Technical Specifications
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Model Number: 3500/25-01-01-00 149369-01
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Manufacturer: Bently Nevada
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Product Type: Keyphasor Module (Phase Reference Input)
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Number of Channels: 2 independent (redundant phase/speed monitoring)
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Input Type: Eddy current proximity probes (3300 XL series), magnetic pickups (variable reluctance), TTL/CMOS digital pulses
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Input Frequency Range: 0-25 kHz (covers 0-150,000 RPM at 60 pulses/rev)
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Output Signal: Digital pulse train (per channel, synchronized to shaft TDC), 24V DC relay contact (alarm/status)
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Phase Reference Accuracy: ±1° (relative to shaft keyphasor, enhanced by 149369-01 firmware)
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Supply Voltage: 24V DC (±10%, from 3500 rack power supply)
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Operating Temperature: 0°C to +65°C (rack-mounted)
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Isolation: 500Vrms (channel-to-rack, per IEC 60664-1)
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Dimensions: 119mm (H) x 25mm (W) x 102mm (D) (3500 half-height slot)
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Weight: 0.16kg (rack-mountable)
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Certifications: CE, UL/cUL, ATEX (optional)
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Firmware Variant: 149369-01 (enhanced phase tracking for rotor dynamics)
Bently 3500/25-01-01-00 149369-01
Core Features & Customer Value
Dual-Channel Redundancy: The 2 independent channels allow simultaneous connection of primary and backup phase sensors (e.g., 1 magnetic pickup + 1 proximity probe) on a single shaft. For engineers, this eliminates single-point failure risks in critical assets like 500MW steam turbines, where loss of phase data would render vibration analysis (e.g., orbit plots) useless.
High-Precision Phase Synchronization: With ±1° phase accuracy (enhanced by 149369-01 firmware), the module ensures vibration data (e.g., from 3500/42M FFT) is aligned with Top Dead Center (TDC). This is critical for diagnosing rotor faults—misalignment of 5° can mask early signs of imbalance, leading to unplanned downtime.
Broad Sensor Compatibility: Supports both eddy current probes (for high-resolution proximity sensing) and magnetic pickups (for simple speed measurement). The 7-pin Micro connector (probes) and terminal block (pickups) simplify integration with existing sensor installations, reducing retrofit costs.
Seamless 3500 System Integration: Native compatibility with 3500/42M monitors (for vibration analysis) and 3500/92 gateways (for DCS data streaming) enables plug-and-play configuration via 3500 Configuration Software. This accelerates commissioning of new assets, such as compressors or generators.
Rotor Dynamics Optimization: The 149369-01 firmware variant improves phase tracking during transient conditions (e.g., startup/shutdown), providing more accurate orbit plots for rotor balancing. For maintenance teams, this reduces the number of balancing iterations required.
Typical Applications
This module is deployed in rotating machinery requiring precise phase reference for vibration analysis or speed monitoring. In steam turbines at power plants, it synchronizes vibration data from 3500/42M monitors with shaft position, enabling detection of blade erosion or rotor bow. Centrifugal compressors at refineries use it to provide phase signals for surge control logic (via DCS), preventing damage from flow instability. Gas turbines employ it for startup speed ramping (0-3,000 RPM) and synchronization with the grid. Hydroelectric generators use it for governor control (speed regulation) and phase locking during并网. The dual-channel design is particularly valued in ethylene crackers, where redundant phase signals ensure continuous monitoring of cracked gas compressors.
