Description
Detailed parameter table
| Parameter name | Parameter value |
| Product model | 3500/45 |
| Manufacturer | Bently Nevada |
| Product category | Machinery Protection System Vibration & Position Monitoring Series |
| Channel configuration | 4 independent monitoring channels (standard configuration) |
| Measurement type | Radial vibration, axial position, keyphasor, differential expansion |
| Frequency range | 0.1 Hz to 10 kHz |
| Sampling rate | 256 samples per second per channel (continuous), 12,800 sps (transient) |
| Accuracy | ±0.2% of full scale |
| Alarm capability | Configurable dual alarm levels per channel (Alert, Danger) |
| Keyphasor support | 0.5 V to 25 V peak-to-peak, 1 Hz to 20 kHz (varies by variant) |
| Operating voltage | 5 VDC, ±15 VDC (from 3500 series rack backplane) |
| Power consumption | 9-11 W (varies by specific variant) |
| Operating temperature | 0°C to +60°C (32°F to +140°F) |
| Form factor | 3500 system rack mount (2 slot width) |
| Dimensions | 266 mm (H) × 72 mm (W) × 229 mm (D) (10.5″ × 2.8″ × 9.0″) |
| Compatibility | 3500 series racks, vibration monitors, transient monitors, sensor cables |
| Certification | UL, CE, RoHS compliant, IEC 61010-1 approved |
BENTLY 3500/45
Product introduction
The 3500/45 from Bently Nevada represents a series of advanced vibration and position monitoring modules that form a specialized branch of the 3500 Machinery Protection System family. These 2-slot modules are distinguished by their integrated keyphasor functionality, which provides precise rotational reference data essential for advanced machinery diagnostics. As an enhanced monitoring solution, the 3500/45 series builds upon the core capabilities of the 3500/42M lineup by adding rotational position synchronization, making it indispensable for applications where vibration analysis must be correlated with machine rotation.
Bently Nevada’s 3500/45 series serves as a critical measurement hub in complex machinery protection systems, converting signals from proximity probes, vibration sensors, and keyphasor transducers into actionable health metrics. These modules maintain the core protection functionality of other 3500 monitoring components while enabling sophisticated diagnostic techniques that require rotational position data. By synchronizing vibration measurements with machine rotation, the 3500/45 series provides deeper insights into machinery behavior, supporting both real-time protection and advanced predictive maintenance strategies across critical industries.
Core advantages and technical highlights
Integrated keyphasor technology: A defining feature of the 3500/45 series is its dedicated keyphasor input, which provides precise rotational reference data for vibration analysis. This enables synchronous data acquisition, order tracking, and phase analysis—capabilities essential for identifying rotation-related issues such as shaft bow, misalignment, and imbalance that would be difficult to detect with vibration data alone.
Enhanced diagnostic capabilities: The 3500/45 series incorporates advanced signal processing that correlates vibration data with rotational position, supporting sophisticated analysis techniques including orbit plots, Bode plots, and polar plots. These tools provide maintenance teams with deeper insights into machinery behavior, enabling more accurate fault diagnosis and reducing time to resolution for complex issues.
Comprehensive measurement coverage: Like other 3500 monitoring modules, 3500/45 variants support multiple critical measurements across four channels, including radial vibration, axial position, and differential expansion. This versatility eliminates the need for multiple specialized modules, simplifying system architecture while providing complete machinery health monitoring.
Synchronized system integration: Modules in the 3500/45 series maintain precise synchronization with transient monitors and other system components, ensuring that high-speed data capture during alarm conditions includes accurate rotational timing information. This synchronized data is invaluable for post-event analysis, providing both vibration amplitude and positional context to understand fault mechanisms.
BENTLY 3500/45
Typical variants and applications
Standard keyphasor variant (exemplified by 176449-04)
The most widely deployed variant, typified by 176449-04, serves as the standard solution for applications requiring keyphasor functionality. Installed in 125744-02 racks, these modules are commonly used in turbine, compressor, and generator monitoring systems where rotational position correlation is essential. Their balanced combination of protection features and diagnostic capabilities makes them suitable for most industrial applications requiring advanced vibration analysis.
High-speed variant
Specialized 3500/45 variants optimized for high-speed machinery extend keyphasor frequency capabilities beyond the standard range, supporting rotational speeds up to 120,000 RPM. These modules are designed for monitoring turbochargers, high-speed blowers, and other equipment where standard keyphasor inputs would be insufficient, providing accurate rotational reference at extreme speeds.
Enhanced environmental variant
Ruggedized 3500/45 variants with extended environmental ratings operate reliably in temperatures ranging from -40°C to +70°C and feature enhanced resistance to vibration and electromagnetic interference. These modules are ideal for offshore platforms, mobile equipment, and other harsh environments where standard electronics might experience performance degradation.
System integration ecosystem
The 3500/45 series integrates with key components in the 3500 ecosystem:
3500 series racks (including 125744-02) provide physical mounting and backplane connectivity
Vibration sensors and keyphasor transducers connected via 136711-01 cables supply input signals
Configuration modules like 136180-01 program monitoring parameters and alarm logic
Complementary monitors such as 176449-02 (3500/42M) extend monitoring coverage in larger systems
Transient monitors including 133388-01 capture synchronized high-speed data during events
Communication gateways like 140734-01 transmit measurement data to enterprise systems
Display modules such as 3500/60 163179-01 visualize real-time data including keyphasor information
This integrated approach ensures comprehensive protection and diagnostic capabilities for complex rotating machinery.
Installation, commissioning and maintenance guidelines
Installation preparation: When installing any 3500/45 module, verify compatibility with target rack firmware and ensure two adjacent slots are available. Confirm power supply capacity meets the module’s requirements (up to 11 W). Gather necessary tools including torque screwdrivers, vibration calibrators, oscilloscopes for keyphasor verification, and configuration laptops. Inspect modules for shipping damage, paying special attention to input connectors and backplane pins.
Maintenance best practices: Include all 3500/45 modules in quarterly inspections, verifying status indicators, communication links, and keyphasor signal integrity. Perform annual calibration using certified vibration standards and keyphasor simulators to maintain measurement accuracy. During scheduled maintenance, verify alarm setpoints, keyphasor thresholds, and synchronization with transient monitors through configuration interfaces. Clean input connectors annually with approved electronic contact cleaner. Update firmware during major system upgrades to ensure compatibility with other 3500 components.
Service and guarantee commitment
Bently Nevada provides comprehensive support for the 3500/45 series, including a 36-month warranty covering manufacturing defects and performance issues across all variants. Our technical support team offers expert guidance on configuration, calibration procedures, and integration with other 3500 system components.
We provide specialized training on advanced vibration analysis with keyphasor data, module programming, and diagnostic interpretation specific to the 3500/45 series. Beyond the warranty period, our service agreements include calibration verification, technical support, and expedited replacement services to minimize downtime. Bently Nevada’s commitment to quality ensures reliable performance of 3500/45 modules throughout their operational lifecycle, backed by our global network of service professionals.
