Description
Product Description
BENTLY 125800-01 (3500/25) is the core Keyphasor® module of Bently Nevada’s 3500 Series condition monitoring system, designed specifically for measuring rotational speed, phase angle, and shaft position of rotating machinery (turbines, compressors, pumps). As a critical component for machinery synchronization and fault diagnosis, BENTLY 125800-01 (3500/25) integrates high-speed signal processing and precision timing technology, enabling real-time capture of Keyphasor events (e.g., shaft keyway passage) to synchronize vibration data with rotational position. Unlike generic speed measurement modules, BENTLY 125800-01 (3500/25) is factory-calibrated to work seamlessly with Bently’s proximity probes and 3500 frame controllers, ensuring sub-millisecond timing accuracy [Product Link: Please supplement], where you can access the module’s technical datasheet and Keyphasor application guide. In practical deployments, BENTLY 125800-01 (3500/25) is paired with 3300 Series proximity probes to track rotor imbalance, misalignment, and bearing wear, providing phase-referenced vibration analysis for predictive maintenance. Additionally, BENTLY 125800-01 (3500/25) supports redundant Keyphasor inputs and fault alarm outputs, ensuring uninterrupted speed monitoring even if one input fails, and its hot-swappable design minimizes system downtime during maintenance.
Product Parameters
| Parameter Category | Specific Specifications |
|---|---|
| Module Type | 3500 Series Keyphasor® speed/phase monitoring module |
| Input Channels | 2 independent Keyphasor inputs (redundant configuration supported) |
| Input Signal Type | Eddy current proximity probe (0-20 V peak-to-peak), TTL logic input |
| Speed Measurement Range | 0.1 RPM to 100,000 RPM |
| Phase Accuracy | ±0.1° (at rated speed) |
| Timing Resolution | 1 μs (Keyphasor event capture) |
| Output Signals | 4-20 mA (speed), relay contact (over/under speed alarm), digital pulse (synchronized) |
| Communication Interface | Modbus TCP/Ethernet (for data upload to System 1 software) |
| Operating Temperature | -40°C ~ 70°C |
| Protection Grade | IP20 (rack installation) |
| Power Supply | 24 VDC redundant power supply (±10%) |
| Compatibility | Bently 3300 XL proximity probes, 3500/40M vibration modules, 3500/05 frame controller |
| Certification | ATEX, IECEx, UL 508, CE |
| Dimensions (L×W×H) | 147 mm × 102 mm × 38 mm |
| Weight | 0.5 kg |
Advantages and Features
- High-Precision Speed/Phase Measurement: BENTLY 125800-01 (3500/25) delivers ±0.1° phase accuracy and sub-millisecond timing, critical for identifying rotor imbalance and misalignment via phase-referenced vibration analysis.
- Redundant Input Design: Dual Keyphasor inputs ensure continuous speed monitoring if one probe or cable fails, meeting the safety requirements of critical machinery (e.g., power plant turbines).
- Seamless System Integration: Calibrated for Bently’s 3500 Series controllers and 3300 probes, BENTLY 125800-01 (3500/25) eliminates compatibility issues and reduces setup time for predictive maintenance systems.
- Hot-Swappable & Easy Maintenance: The module supports online hot-swapping without powering down the 3500 frame, minimizing downtime for module replacement or calibration.
- Comprehensive Alarm Functions: Configurable over-speed, under-speed, and Keyphasor loss alarms with relay outputs, enabling immediate shutdown or notification for abnormal machinery conditions.
- Explosion-Proof Compliance: ATEX/IECEx certification allows installation in Zone 1 hazardous areas (refineries, chemical plants), ensuring safe operation in flammable environments.
Application Fields and Cases
Core Application Fields
- Power Industry: Turbine generator speed/phase monitoring, boiler feed pump synchronization
- Petroleum and Chemical Industry: Refinery compressor rotational position tracking, pipeline pump imbalance diagnosis
- Metallurgical Industry: Blast furnace blower phase analysis, rolling mill main drive speed control
- Marine Engineering: Ship propulsion turbine Keyphasor monitoring, offshore platform gas compressor fault detection
Typical Application Case
In a 800MW combined-cycle power plant’s gas turbine monitoring project, the plant deployed BENTLY 125800-01 (3500/25) modules with 3300 XL proximity probes to track turbine rotor speed, phase angle, and vibration synchronization. BENTLY 125800-01 (3500/25) captured Keyphasor events at 1μs resolution, enabling the plant’s predictive maintenance system to identify a 0.5° phase shift in the high-pressure turbine rotor—indicating early-stage misalignment. Maintenance teams used the phase data from BENTLY 125800-01 (3500/25) to realign the rotor during a scheduled outage, preventing a potential catastrophic failure that could have cost over $1 million in downtime. The module’s redundant inputs also ensured uninterrupted speed monitoring during a probe cable replacement, validating its reliability for critical power generation equipment [Product Link: Please supplement] (see the project’s failure analysis report and phase trend data).
Competitor Comparison (vs. Emerson CSI 6500 Keyphasor Module)
| Comparison Dimension | BENTLY 125800-01 (3500/25) | Emerson CSI 6500 Keyphasor Module |
|---|---|---|
| Phase Accuracy | ±0.1° | ±0.5° |
| Timing Resolution | 1 μs | 10 μs |
| Redundant Inputs | 2 channels (built-in) | 1 channel (external redundancy required) |
| Hot-Swapping | Supported (3500 frame) | Not supported |
| Hazardous Area Certification | ATEX/IECEx Zone 1 | ATEX Zone 2 only |
| Speed Range | 0.1 RPM ~ 100,000 RPM | 1 RPM ~ 50,000 RPM |
| System Compatibility | Exclusive to Bently 3500 Series | Cross-compatible with Emerson CSI systems |
| Cost-Effectiveness | Mid-to-high end (premium for precision) | Mid-range (basic Keyphasor functionality) |
Selection Suggestions
- Accuracy Requirements: Prioritize BENTLY 125800-01 (3500/25) for critical machinery (turbines, compressors) requiring ±0.1° phase accuracy; choose Emerson CSI 6500 for general equipment with lower precision needs.
- Redundancy Needs: Select BENTLY 125800-01 (3500/25) for applications where uninterrupted speed monitoring is mandatory (e.g., power plants); opt for single-input modules for non-critical assets.
- Environment Matching: Use ATEX-certified BENTLY 125800-01 (3500/25) in Zone 1 hazardous areas; standard versions are suitable for ordinary industrial environments.
- System Compatibility: Ensure compatibility with Bently 3500 frame controllers and 3300 Series proximity probes (confirm probe type: 8mm/11mm/25mm).
- Spare Parts Reserve: Reserve 1 BENTLY 125800-01 (3500/25) module per 5 critical machines to minimize downtime during module failures.
Precautions
- Install BENTLY 125800-01 (3500/25) in the 3500 frame with proper grounding (ground resistance ≤4Ω) to avoid electromagnetic interference affecting phase accuracy.
- Align Keyphasor probes with the rotor keyway or reflector strip (gap: 0.5-1mm) to ensure reliable event capture; misalignment may cause phase errors or signal loss.
- Calibrate the module’s speed thresholds and alarm settings using Bently’s System 1 software, following the machinery’s OEM specifications (e.g., turbine over-speed limit).
- Route Keyphasor probe cables (e.g., BENTLY 106M1079-01) away from high-voltage equipment and motor drives to prevent signal distortion; use shielded cables with proper grounding.
- Perform hot-swapping only when the 3500 frame’s redundant power supply is active; wear an anti-static wristband to avoid damaging the module’s internal circuitry.
- Store spare modules in anti-static packaging in a dry, temperature-controlled environment (-20°C ~ 50°C) to prevent component degradation.
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