وصف
Product Overview
The Bently Nevada 3500/70M is a dedicated machinery protection module developed for reciprocating compressors and low-speed industrial equipment operating within the 3500 monitoring platform.
The monitor combines vibration analysis, impulse detection, and velocity measurement in a single rack-based module. It continuously evaluates mechanical behavior to identify abnormal impact events, looseness, valve deterioration, and piston-related faults before they lead to unscheduled shutdowns or severe mechanical damage.
Designed for high-reliability process industries, the 3500/70M provides real-time protection functions together with long-term condition monitoring capabilities.
Core Monitoring Functions
The 3500/70M performs dynamic vibration analysis using configurable signal processing techniques optimized for reciprocating machinery.
Main operating functions include:
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Continuous casing vibration monitoring
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Reciprocating impact detection
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Rod and shaft motion supervision
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High-frequency acceleration analysis
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Machinery protection alarm processing
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Real-time signal conditioning and filtering
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Relay activation through the 3500 rack system
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Integration with plant monitoring and diagnostic software
The module is optimized for machinery exhibiting cyclic impact behavior that conventional vibration monitors may not accurately detect.
Input and Sensor Compatibility
The monitor supports multiple industrial transducer types used in compressor protection systems.
| Sensor Type |
Application |
| Velocity Transducers |
Casing vibration monitoring |
| Velomitors |
Low-frequency machinery analysis |
| Proximity Probes |
Rod position and shaft movement |
| Acceleration Sensors |
Impact and impulse detection |
The module accepts independently configurable inputs across four monitoring channels.
Monitoring Parameters
Reciprocating Impulse Monitoring
Designed to identify repetitive mechanical impacts associated with:
Velocity Monitoring
Measures casing vibration levels in:
Peak and RMS processing methods are supported.
Acceleration Monitoring
High-frequency acceleration analysis enables early identification of impact-related mechanical faults.
Technical Specifications
| Parameter |
Specification |
| Model |
3500/70M |
| Product Type |
Reciprocating Impulse / Velocity Monitor |
| Manufacturer |
Bently Nevada |
| System Compatibility |
3500 Machinery Protection System |
| Monitoring Channels |
4 Independent Channels |
| Input Types |
Velocity, Proximity, Acceleration |
| Signal Processing |
Digital filtering and conditioning |
| Alarm Functions |
Alert and Danger setpoints |
| Alarm Delay |
0.1 to 60 seconds programmable |
| Relay Compatibility |
3500 rack relay modules |
| Buffered Outputs |
Front-panel BNC connectors |
| Communication Indicators |
TX/RX LED status |
| Bypass Indication |
Front-panel bypass LED |
| Operating Temperature |
-30°C to +65°C |
| Storage Temperature |
-40°C to +85°C |
| Humidity Rating |
95% non-condensing |
| Rack Requirement |
Single-slot 3500 rack module |
The module supports integration with rack-based shutdown systems for emergency protection logic.
Front Panel Features
The front interface of the 3500/70M includes status indicators and buffered outputs for diagnostics and maintenance activities.
| Indicator |
Function |
| OK LED |
Module operating status |
| TX/RX LED |
Rack communication activity |
| Bypass LED |
Indicates bypassed channels |
| BNC Buffered Outputs |
Raw signal access for analyzers |
Buffered outputs allow portable diagnostic instruments to capture vibration waveforms without interrupting system operation.
Typical Industrial Applications
The 3500/70M is primarily installed in machinery protection systems for reciprocating equipment operating under critical process conditions.
Common applications include:
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Reciprocating compressors
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Process gas compressors
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Hydrogen compressors
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Pipeline compressor stations
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Engine-driven compressors
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Low-speed industrial machinery
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API 670 machinery protection systems
The module is particularly effective for detecting impact-related failures that develop gradually during machine operation.
FAQ
Q: What machinery is the 3500/70M designed for?
The module is intended primarily for reciprocating compressors and other low-speed machinery requiring impact and vibration monitoring.
Q: How many channels does the monitor support?
The 3500/70M provides four independently configurable monitoring channels.
Q: Can the module detect mechanical looseness?
Yes. The impulse monitoring algorithms are specifically designed to identify looseness, valve wear, and impact-related faults.
Q: Are buffered outputs available for portable analyzers?
Yes. Front-panel BNC connectors provide direct access to raw vibration signals for diagnostic equipment.
