Description
Detailed parameter table
| Parameter name | Parameter value |
| Product model | 3500/25-01-01-00 |
| Manufacturer | BENTLY NEVADA |
| Product category | Keyphasor monitor module |
| Electrical performance | 24V DC power supply; 4-channel input (Keyphasor signals); 4-20mA output per channel; Power consumption: 6W max |
| Physical size | Width: 24.4mm, Height: 241.3mm, Depth: 242mm |
| Interface type | BNC connectors for Keyphasor sensor inputs; Terminal blocks for power and analog outputs; Backplane connector for system communication |
| Communication protocol | Integrates with 3500 series system bus; Supports analog output for DCS/SCADA integration |
| Environmental requirements | Operating temperature: -40°C to +70°C; Humidity: 5% – 95%, non-condensing; Vibration resistance: 10g peak (10-2000Hz) |
| Installation method | Rack-mountable in 3500 series racks; Occupies 1 standard slot |
| Performance indicators | Frequency range: 1Hz – 30kHz; Accuracy: ±0.01% of reading; Resolution: 16-bit; Phase measurement accuracy: ±0.1 degrees |
BENTLY 3500/25-01-01-00
Product introduction
The BENTLY NEVADA 3500/25-01-01-00 is a precision 4-channel Keyphasor monitor module, a specialized component within the 3500 series machinery protection system. It is designed to track the rotational position and speed of rotating machinery, serving as a critical reference for synchronizing vibration and position measurements in industrial monitoring setups.
This module processes signals from Keyphasor sensors—typically proximity transducers mounted to detect a notch or keyway on a rotating shaft. It converts these signals into precise measurements of shaft speed, phase angle, and rotational position. The 3500/25-01-01-00 delivers standardized 4-20mA outputs for each channel, enabling seamless integration with control systems and other 3500 series modules like the 3500/33 149986-01 vibration monitor. In automation architectures, it acts as a timing reference, ensuring that vibration and position data are correlated to specific points in the machinery’s rotation, which is essential for accurate diagnostics of issues like imbalance, misalignment, and shaft cracks.
Core advantages and technical highlights
Precision speed and phase measurement: The 3500/25-01-01-00 offers exceptional accuracy in speed and phase measurements, with a frequency range of 1Hz to 30kHz and phase measurement accuracy of ±0.1 degrees. This precision is critical for identifying subtle rotational anomalies, such as speed fluctuations in turbines or phase shifts in compressor rotors, which can indicate early-stage mechanical issues.
Multi-channel synchronization: With 4 independent channels, the module can monitor multiple rotating components within a machinery train—such as a turbine, gearbox, and generator—simultaneously. It synchronizes these measurements to provide a unified view of rotational behavior, enabling engineers to analyze how vibrations in one component affect others. This is particularly valuable in complex machinery systems where interactions between components are common.
Seamless integration with vibration monitors: The module is engineered to work in tandem with vibration monitors like the 3500/33 149986-01. By providing a precise rotational reference, it allows the vibration monitor to perform order analysis—filtering vibration data by rotational speed—to isolate speed-dependent faults. This integration enhances the diagnostic capabilities of the entire 3500 system, making it easier to distinguish between imbalance (a 1x speed component) and misalignment (a 2x speed component).
Robust signal processing: The 3500/25-01-01-00 features advanced signal conditioning to handle noisy Keyphasor signals, which is common in industrial environments with electromagnetic interference. It maintains measurement accuracy even with signal amplitude variations, ensuring reliable performance in harsh conditions such as steel mills or petrochemical plants.
Typical application scenarios
In gas turbine power plants, the 3500/25-01-01-00 monitors the rotational position of the turbine shaft. By providing a precise Keyphasor reference, it enables the 3500/33 149986-01 vibration monitor to perform order tracking, isolating vibration components at the turbine’s operating speed and its harmonics. This helps detect issues like rotor imbalance or blade damage, which can be addressed during planned maintenance to avoid unplanned shutdowns.
Within chemical processing facilities, the module is used to monitor centrifugal compressors. It tracks the phase relationship between the compressor’s rotational position and vibration measurements, helping identify issues like shaft misalignment or bearing wear. By synchronizing with the facility’s DCS via its 4-20mA outputs, it provides real-time speed data that can be used to optimize compressor performance and energy efficiency.
In paper mills, the 3500/25-01-01-00 monitors the rotational speed of large rolls used in the papermaking process. It detects speed fluctuations that could affect paper quality, such as uneven thickness or surface defects. By integrating with the mill’s SCADA system, it triggers alerts when speed deviates from the optimal range, allowing operators to make adjustments before quality issues occur.
BENTLY 3500/25-01-01-00
Relationship with other 3500 series modules
The 3500/25-01-01-00 plays a complementary role with other modules in the 3500 series:
With the 3500/33 149986-01 vibration monitor: It provides the rotational reference needed for order analysis, enhancing the vibration monitor’s ability to isolate speed-dependent faults.
With the 3500/45 position monitor: It synchronizes position measurements with rotational position, enabling accurate tracking of shaft axial movement relative to rotation, which is critical for thrust bearing monitoring.
With the 3500/92-04-01-00 136180-01 communication gateway: It shares speed and phase data via the system bus, which the gateway transmits to plant-wide control systems for centralized monitoring.
Related model recommendations
3500/25-02-01-00: A variant with enhanced diagnostic features, suitable for applications requiring advanced fault detection in rotational machinery.
330103-00-05-10-02-00: A Keyphasor proximity transducer that pairs with the 3500/25-01-01-00 to provide high-quality rotational position signals.
3500/33 149986-01: Vibration monitor module that uses Keyphasor data from the 3500/25-01-01-00 for order analysis and synchronized vibration measurements.
3500/15 106M1079-01: Power supply module that provides stable 24V DC to the 3500/25-01-01-00, ensuring consistent performance.
149992-01: Shielded BNC cable assembly for connecting Keyphasor sensors to the module, minimizing signal interference in noisy environments.
3500/55: Display and keypad module that allows local monitoring of speed and phase data from the 3500/25-01-01-00.
3500/20: Rack interface module that facilitates communication between the 3500/25-01-01-00 and other 3500 series components.
Installation, commissioning and maintenance instructions
Installation preparation: Before installing the 3500/25-01-01-00, power off the 3500 rack and ensure proper grounding. Check that the installation environment meets temperature and humidity requirements. Required tools include a torque wrench (0.5-0.7Nm), Phillips screwdriver, and anti-static wrist strap. Inspect the module for damage and clean BNC connectors with isopropyl alcohol. Align with rack guides, insert until the backplane connector engages, and secure with mounting screws.
Commissioning: After installation, power on the rack and use BENTLY NEVADA configuration software to set up the module. Configure frequency ranges, phase references, and alarm thresholds for each channel based on machinery specifications. Calibrate using a reference signal generator to verify speed and phase accuracy. Test synchronization with connected modules like the 3500/33 149986-01 to ensure data correlation. Check LED indicators: a steady green “OK” light indicates normal operation, while status lights confirm signal detection on each channel.
Maintenance suggestions: Perform monthly visual inspections to check for loose connections, dust, or overheating. Clean the module with a dry, lint-free cloth. Calibrate annually using BENTLY NEVADA’s calibration kit to maintain ±0.01% accuracy. If signal loss occurs, check Keyphasor sensor alignment and cable integrity—replace damaged 149992-01 cables with genuine parts. For phase drift issues, verify sensor mounting stability and recheck calibration. Keep a maintenance log documenting calibrations, synchronization checks, and repairs to track performance.
Service and guarantee commitment
The 3500/25-01-01-00 comes with a 12-month warranty covering manufacturing defects. During this period, we offer free repair or replacement for faulty units. Our technical support team provides 24/7 assistance for installation, configuration, and troubleshooting via phone, email, and online chat. We supply comprehensive documentation, including calibration procedures and synchronization guides with other 3500 series modules.
For critical applications, optional extended warranties (up to 3 years) are available, including on-site support and priority service. Backed by BENTLY NEVADA’s expertise in rotational machinery monitoring, the 3500/25-01-01-00 is guaranteed to deliver reliable Keyphasor measurements, enhancing the diagnostic capabilities of your 3500 series system and ensuring optimal machinery performance.
