Description
Product Overview
The Bently Nevada 3500/70-01-01 is a 4-channel Recip Impulse / Velocity Monitor within the 3500 Machinery Protection System, designed specifically for reciprocating compressor condition monitoring. It accepts seismic transducer inputs (accelerometers and velocity sensors), processes impulse acceleration and velocity signals from crosshead, crankcase and valve components, compares measured values against configurable alarm and trip setpoints to protect reciprocating compression equipment. The suffix 01-01 defines firmware and I/O configuration variant for standard reciprocating monitoring applications.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| Model | 3500/70-01-01 |
| Module Type | 4-Channel Recip Impulse / Velocity Monitor |
| Number of Channels | 4 independent seismic measurement channels |
| Supported Transducers | 330400 / 330425 accelerometers, Velomitor CT velocity sensors |
| Measurement Functions | Impulse Acceleration, Acceleration, Recip Velocity, Low-Frequency Recip Velocity |
| Front Interface | 4 × BNC sensor input connectors; multi-status LED indicators |
| Power Consumption | Typical 7.7 W, powered from rack backplane |
| Safety Rating | SIL 2 capable (IEC 61508) |
| Operating Temperature | -30°C ~ +65°C |
| Storage Temperature | -40°C ~ +85°C |
| Relative Humidity | 5% ~ 95%, non-condensing |
| Mounting | Slot mount inside 3500 rack, paired with rear I/O card |
| Dimensions | Standard 3500 series single-width module form factor |
Key Features
- Four independent seismic channels for reciprocating compressor crosshead and crankcase vibration monitoring
- Optimized signal processing to capture high-frequency impulse events from valve impacts and mechanical looseness
- Software configurable alarm / trip thresholds for each channel, independent alert and danger setpoints
- Continuous on-board diagnostics for transducer fault, open/short circuit and module health
- Compatible with System 1 condition monitoring software for trending, waveform capture and event recording
- Front panel BNC connectors simplify transducer wiring and signal injection testing
- Hot-swappable within 3500 rack without full system shutdown
- Supports reciprocating machinery-specific fault detection: loose bolts, valve failure, crosshead pin wear
Installation & Test Notes
- Power down the 3500 rack and perform lockout/tagout before module replacement.
- Use ESD protection; avoid touching backplane gold contacts and PCB traces.
- Insert 3500/70-01-01 module into designated rack slot and secure front retaining screw.
- Install matching rear I/O module and connect seismic sensor cables to front BNC ports.
- Configure channel parameters, transducer type, alarm and trip setpoints using 3500 configuration software.
- Power on rack, verify module PASS LED and confirm no channel fault alarms.
- Perform signal injection test to validate channel reading accuracy and alarm trip operation.
- Connect to System1 to verify data trending and transient waveform capture functions.
- Periodically inspect sensor cables and BNC connectors for corrosion or loose connections.
Application
Reciprocating compressors in natural gas pipelines, refineries, petrochemical plants and gas processing facilities. Monitors crosshead vibration, crankcase impacts and valve mechanical faults to prevent catastrophic reciprocating compressor failures and unplanned shutdowns.
FAQ
Q: What equipment is 3500/70-01-01 designed to monitor? A: It is dedicated for reciprocating compressors, used to monitor impulse and velocity vibration from crossheads, crankcases and compressor valves.
Q: What sensors can connect to this module? A: Bently Nevada 330400, 330425 accelerometers and Velomitor CT velocity transducers.
Q: Is it hot-swappable? A: Yes, the 3500 series monitor modules support hot-slot replacement while the rack remains energized.
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