1. Product Description The BENTLY 85515-02 is a high-reliability overspeed protection module designed for critical rotating machinery, such as gas turbines and compressors. As part of the BENTLY 3500 modular monitoring system, it provides real-time speed measurement, alarm triggering, and shutdown capabilities to prevent catastrophic overspeed events. The module supports dual-channel inputs for redundancy, hot-swap functionality for maintenance flexibility, and integrates seamlessly with BENTLY’s System 1 software for advanced condition analysis. Its compact design and rugged construction make it suitable for harsh industrial environments, ensuring continuous operation in power generation, oil & gas, and manufacturing sectors.
2. Technical Parameters
Parameter
Specification
Input Voltage
24 VDC ±10% (for module operation)
Power Supply
20–34 VDC or 90–140 VDC (external input)
Channels
Dual-channel (A and B) for redundant protection
Speed Range
0–100,000 RPM (configurable)
Alarm Outputs
4 solid-state relays (2 per channel)
Communication
Modbus RTU (RS-485) for integration with PLC/DCS
Operating Temperature
-40°C to +70°C
Compatibility
BENTLY 3500 racks, System 1 software
BENTLY 85515-02
3. Advantages and Features
Dual-Channel Redundancy: Ensures fail-safe operation by comparing two independent speed signals.
Hot-Swap Capability: Allows replacement without system downtime, reducing maintenance costs.
Precision Speed Monitoring: Uses advanced algorithms to detect overspeed within milliseconds.
Customizable Alarms: Configurable setpoints for pre-trip warnings and emergency shutdowns.
Wide Voltage Range: Supports both low and high DC input voltages for versatile applications.
4. Application Fields and Case Studies
Energy: Protecting gas turbines in power plants during load fluctuations.
Oil & Gas: Monitoring compressor trains in offshore platforms.
Manufacturing: Preventing overspeed in high-speed rotating equipment.
Case Study: A petrochemical plant avoided $2M in potential damages by deploying the 85515-02 to trigger emergency shutdowns during unexpected speed surges in their centrifugal compressors.
BENTLY 85515-02
5. Competitor Comparison The 85515-02 outperforms alternatives with:
Built-in redundancy for SIL 2 compliance, reducing the need for external safety modules.
Faster response time (≤10 ms) compared to legacy overspeed systems.
Compatibility with BENTLY’s comprehensive System 1 analytics suite for predictive maintenance.
6. Selection Recommendations
System Integration: Pair with BENTLY 3500 racks for unified machinery health monitoring.
Safety Requirements: Choose the dual-channel version for applications requiring SIL 2 certification.
Expansion Needs: Ensure rack space for future additions like vibration or temperature modules.
7. Precautions
Power Stability: Use a filtered power supply to avoid voltage spikes.
Sensor Calibration: Verify proximity probe alignment and signal integrity before commissioning.
Firmware Updates: Regularly update to access new features and security patches.
Shanxi Xinyeda International Trade Co., Ltd. specializes in BENTLY 85515-02 and automation solutions. Visit www.xydcontrol.com for sales and technical support.
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Full 12-month warranty on all components
Full 12-month warranty on all components
