Description
Bently 3500/72M | Part Number:176449‑08
Technical Specifications:
- Channel Quantity:4 independent rod‑position measurement channels
- Supported Transducer: 3300‑series eddy‑current proximity probe system
- Power Consumption: 10 Watts nominal
- Operating Temperature:0°C ~ +60°C
- Storage Temperature:‑40°C ~ +85°C
- Rack Slot Occupation:2 slots
- Certifications:SIL2, CE, UL, ATEX hazardous‑area certification Functional Features:
- Measures reciprocating compressor cross‑head rod drop displacement
- Synchronize measurement with Keyphasor crank‑angle pulse signal
- Programmable alarm thresholds for rod drop value
- Proximity probe system fault diagnosis including gap voltage monitoring
- Individual channel bypass for maintenance work
- Alarm can trigger 3500 relay modules for unit trip protection
- Supports waveform data upload to System 1 software for fault analysis Application Scenarios:
- Petrochemical and refinery reciprocating compressors cross‑head rod drop online monitoring
- Natural gas transmission reciprocating compressor mechanical protection
- All API‑618 standard reciprocating compressor requiring rod‑drop protection Performance Parameters:
- Displacement Measuring Accuracy: ±1% full scale
- Sampling Synchronization: Synchronized with Keyphasor crank‑angle signal
- Compatible Probe Sensitivity: 7.87 V/mm standard eddy‑current probe Material Composition:
- Front panel: Oxidation‑treated aluminum alloy
- Main circuit board: Multi‑layer FR‑4 fire‑retardant PCB
- Shield housing: Cold‑rolled steel anti‑vibration anti‑EMI shell
- Backplane bus connector: Gold‑plated industrial connector Structural Characteristics:
- Two‑slot plug‑in module for 3500 rack system
- Front panel LED indicators: OK, Fault, Alarm, Bypass
- Internal termination design, field transducer cable connects directly to rear internal I/O assembly 176449‑08 without external terminal block
- Mechanical locking screws on both sides for rack mounting Working Principle: Eddy‑current proximity probe signals transmit directly to rear internal termination assembly 176449‑08. Module receives crank‑angle synchronous pulse from 3500/25 Keyphasor module. It samples rod displacement signal at specified crank angle position, calculates rod‑drop value. Compare measured rod‑drop value with alarm setpoints. When over‑threshold condition occurs, alarm message is sent to rack backplane bus, drive relay module to execute protection trip, meanwhile upload measurement waveform data to System1 monitoring softwareBaker Hugh…. Installation Requirements:
- Install module into two adjacent slots inside 3500 rack, power‑off rack before plug‑in or pull‑out, non‑hot‑swap
- Proximity probe extension cable connects directly to rear internal termination assembly 176449‑08
- Use Bently Nevada certified matched eddy‑current probe and extension cable
- Must configure 3500/25 Keyphasor module for crank‑angle synchronization
- Keep sufficient ventilation clearance for heat dissipation Usage Notes:
- Configure probe sensitivity and measuring range in 3500 configuration software before commissioning
- Check probe gap voltage during commissioning
- Do not change total length of probe‑cable system arbitrarily
- Inspect rear internal termination terminals regularly for loose contact
- Perform static calibration of probe system on periodic maintenance cycle
