Description
Bently Nevada 3500/77M-03-00 (176449-07)
Technical Specifications:
- Channels: 4 channels
- Frequency Response: 0 to 5.5 kHz
- Sensor Power Supply: 23.0 ±0.8 VDC, current limited to 24.5 mA
- Pressure Accuracy: 0.5% at 77°F for 0.5 to 10.0 Volts; 1.0% across 22°F to 150°F range for 0.5 to 10.0 Volts
- Front Panel LEDs: OK, TX/RX, Bypass
- Output: Digital signal output
- Operating Temperature: Industrial ambient conditions
Functional Features:
- Four independent channels for simultaneous multi-cylinder monitoring
- Each channel provides eight measurement variables related to cylinder pressure operation
- Five values associated with a single chamber: discharge pressure, suction pressure, maximum pressure, minimum pressure, and compression ratio
- Three calculated measurement variables combining channel values with configured mechanical parameters: peak rod compression, peak rod tension, and rod reversal degree
- User-programmable alarm setpoints for each active measurement variable
- Danger setpoints configurable for any two active measurement variables
- Continuous comparison of monitored parameters against configured alarm setpoints for mechanical protection
Application Scenarios:
- Reciprocating compressor monitoring in oil and gas production facilities
- Petrochemical plant reciprocating compressor protection
- Natural gas compression stations
- Industrial gas processing plants
- Refinery reciprocating compressor monitoring
- Any application requiring real-time cylinder pressure analysis and rod load monitoring
Performance Parameters:
- Measurement Variables per Channel: Eight (discharge pressure, suction pressure, maximum pressure, minimum pressure, compression ratio, peak rod compression, peak rod tension, rod reversal degree)
- Frequency Response: 0 to 5.5 kHz
- Pressure Accuracy: 0.5% at 77°F; 1.0% across operating temperature range
Material Composition: Industrial-grade electronic components in a standard 3500 rack module enclosure with front panel LED indicators
Structural Features: 4-channel front plug-in monitor occupying one 3500 rack slot. Front panel features OK, TX/RX, and Bypass LED indicators for quick visual diagnostics.
Working Principle: The module receives dynamic pressure signals from cylinder-mounted pressure sensors, conditions the signals through internal signal processing circuitry, and extracts pressure waveform characteristics. From each pressure waveform, the module calculates discharge pressure, suction pressure, maximum pressure, minimum pressure, and compression ratio. By combining pressure data with configured mechanical parameters (such as piston area and rod diameter), the module further calculates peak rod compression, peak rod tension, and rod reversal degree. These values are continuously compared against user-programmable alarm setpoints.
Installation Requirements:
- Install in a Bently 3500 rack within an IP-rated cabinet
- Connect approved Bently Nevada pressure sensors to the module input terminals
- Ensure sensor power supply wiring meets specifications (23.0 ±0.8 VDC)
- Route sensor cables away from high-voltage power cables
- Configure mechanical parameters (piston area, rod diameter, etc.) through 3500 configuration software
Usage Notes:
- Only use Bently Nevada approved pressure sensors with this module
- Verify sensor power supply voltage before operation
- Configure all eight measurement variables and alarm setpoints through 3500 configuration software
- Monitor the front panel OK LED to confirm proper module operation
- The TX/RX LED indicates communication activity
- The Bypass LED indicates when the channel is in bypass mode
- Refer to user guide document 146282 for detailed configuration procedures
