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Help CenterBENTLY 3500/42M 176449-02 — Multi-channel Proximitor/Seismic Monitor for Critical Machinery Protection
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Warranty: 365 days standard coverage
Lead time: 1 week if in stock; no more than 1 month at the latest
Payment: 50% advance payment; full payment prior to delivery
Express options: FedEx, UPS, DHL
4 independent channels – Monitors vibration or position using Proximitor (eddy-current) and seismic sensors (velocity or accelerometer).
Machinery protection logic – Configurable Alert/Danger setpoints with latched alarms, voting, and trip integration via 3500 relay modules.
Buffered transducer outputs – Convenient BNC access at the I/O for portable analyzers and scope checks.
Phase-referenced measurements – Supports 1X amplitude/phase and diagnostics when paired with a 3500/25 Keyphasor module.
Flexible measurement types – Radial vibration, thrust position, shaft-relative measurements, and casing velocity/acceleration as required.
Rack-level integration – Works with 3500/22M TDI for Ethernet communications, and 3500/33 or 3500/32 modules for relays or 4–20 mA outputs respectively.
Hot-swappable front card – Front module pairs with a matching rear I/O module for fast maintenance in most cases.
| Brand / Model | BENTLY 3500/42M, assembly variant 176449-02 |
| HS Code | 9032.89 (Automatic regulating/controlling instruments, other) |
| Power Requirements | Supplied by 3500 rack backplane (no separate external power to the module) |
| Dimensions & Weight | Single-width 3500 front module with rear I/O; approx. 1-slot width; weight ~0.45 kg (typical) |
| Operating Temperature | Typically 0 to +65°C; installation in a ventilated control cabinet recommended |
| Signal Input/Output Types | 4 transducer inputs: eddy-current Proximitor probes, velocity pickups, IEPE accelerometers; buffered outputs available at I/O BNCs |
| Communication Interfaces | Via 3500/22M TDI over Ethernet (for configuration, data collection, and plant system links such as Modbus TCP) |
| Installation Method | Hot-swappable front card in 3500 rack monitor slot; matching rear I/O module (176449-02 variant) on the backplane |
Typically used on steam and gas turbines, compressors, large motors, pumps, fans, gearboxes, and generators. In many cases, the 3500/42M takes the lead channels for radial vibration and thrust position, while the rack’s relay modules handle shutdown logic. A maintenance lead at a combined-cycle plant told us they swapped in the 42M during a planned outage and immediately saw more stable alert thresholds on a critical compressor train, with cleaner buffered signals for route-based analysis.
Reliability – Proven monitor within the 3500 platform; seems to be the standard in many plants for continuous protection.
Compatibility – Works with common Proximitor probe systems (5 m / 9 m / 14 m) and seismic sensors; integrates with Keyphasor, relay, and TDI modules.
Lifecycle cost – Shared rack infrastructure, hot-swap design, and reusable transducer wiring can reduce downtime and retrofitting costs.
Data accessibility – Buffered outputs and Ethernet access via TDI support quick diagnostics and connection to condition monitoring software.
Scalability – Start with protection channels and extend to plant interfaces (Modbus TCP) or 4–20 mA outputs using 3500/32 if required.
Cabinet & environment – Mount modules in a clean, ventilated control cabinet; maintain ambient temperatures within spec and allow airflow around the rack.
Wiring – Use shielded twisted-pair per Bently Nevada guidelines; maintain probe/cable lengths (e.g., 5 m, 9 m, 14 m systems) and ensure solid grounding to minimize noise.
Commissioning – Verify probe gaps and polarity, perform static and dynamic checks, configure Alert/Danger setpoints, and validate relay voting if used.
Routine maintenance – Periodically review trends and alarm logs, clean connectors, confirm buffered output signal quality, and back up configurations via 3500/22M.
Firmware & calibration – Keep rack/module firmware aligned with plant standards; check transducer calibration status during scheduled outages.
Safety – De-energize affected channels when moving wiring on the I/O; follow lockout/tagout procedures and observe ESD precautions.
The 3500 series typically carries CE and UL/cUL certifications, with RoHS compliance on most current builds. Exact approvals may vary by rack and I/O option set, so we can confirm documentation for the specific 176449-02 configuration. Standard warranty is 365 days.
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