Description
Product Description
The Bently Nevada 3500/72M is a four-channel reciprocating compressor monitoring module developed for integration within the 3500 Machinery Protection System. The monitor receives signals from proximity transducers, processes both dynamic and static rod position data, and continuously evaluates operating conditions against programmable protection thresholds.
Engineered specifically for reciprocating compressor applications, the module supports machinery condition monitoring, rod drop analysis, and shutdown protection functions. Each channel can be configured independently to generate multiple measured variables, allowing flexible monitoring strategies for compressor cylinders, crossheads, and piston rod movement.
Using 3500 Rack Configuration Software, users can define Alert and Danger alarm limits, activate relay outputs, and configure measurement logic according to machine operating requirements.
Key Features
- Four independent monitoring channels
- Designed for reciprocating compressor protection systems
- Supports static and dynamic rod position measurements
- Continuous comparison against configurable alarm limits
- Compatible with Bently Nevada 3500 racks
- Buffered outputs for diagnostics and analysis equipment
- Front-panel communication and status indicators
- Supports relay activation through 3500 system modules
Monitoring Capabilities
The 3500/72M module can process and monitor several compressor-related parameters, including:
- Rod Position
- Rod Drop
- Hyper Compressor Position
- Dynamic Position
- Differential Expansion-Style Measurements
- Gap Voltage Monitoring
- Phase Reference Measurements
Each channel may be configured for individual measurement functions depending on compressor design and sensor arrangement.
Technical Specifications
| ParameterSpecification |
|
| Product Type |
Recip Rod Position Monitor |
| Model |
3500/72M |
| System Platform |
Bently Nevada 3500 Series |
| Channels |
4 independent channels |
| Sensor Compatibility |
Proximity probes and position transducers |
| Signal Type |
Static and dynamic position signals |
| Transducer Power Supply |
-24 VDC |
| Buffered Output Impedance |
510 Ω |
| Recorder Outputs |
4–20 mA proportional outputs |
| Maximum Recorder Load |
600 Ω |
| Output Update Rate |
Less than 100 ms |
| Alarm Configuration |
Alert and Danger setpoints |
| Alarm Modes |
Latching or non-latching |
| Front Panel Indicators |
OK, TX/RX, Bypass |
| Power Consumption |
Approximately 7 W |
| Rack Compatibility |
3500 Machinery Protection System |
Input Characteristics
| ItemSpecification |
|
| Input Channels |
Four |
| Supported Sensors |
Proximity probes, displacement transducers |
| Input Signal Conditioning |
Dynamic and static position processing |
| Signal Comparison |
Continuous against configured limits |
| Configuration Method |
3500 Rack Configuration Software |
Environmental & Physical Data
| ParameterValue |
|
| Operating Temperature |
-30°C to +65°C |
| Weight |
0.85 kg |
| Installation Type |
Rack-mounted module |
| Country of Origin |
USA |
Application Areas
The Bently Nevada 3500/72M monitor is commonly installed in:
- Reciprocating compressors
- Hyper compressor systems
- Petrochemical compressor trains
- Gas processing plants
- Refinery compression systems
- Heavy-duty industrial machinery protection systems
System Integration
When combined with other Bently Nevada 3500 modules, the 3500/72M can participate in:
- Compressor shutdown logic
- Alarm annunciation systems
- Condition monitoring platforms
- Distributed control systems (DCS)
- Predictive maintenance programs
FAQ
What is the primary function of the 3500/72M module?
The module monitors reciprocating compressor rod position and related displacement measurements to help protect machinery from abnormal operating conditions.
Can the module generate analog outputs for external systems?
Yes. The unit provides proportional 4–20 mA recorder outputs for connection to PLC, DCS, and monitoring systems.
Does the 3500/72M support alarm functions?
Yes. Each channel supports programmable Alert and Danger setpoints with configurable relay interaction through the 3500 platform.
