Bently Nevada 350025-184684-01 – 3500/25 Keyphasor/Speed Module with 184684-01 Rear I/O Plate

The Bently Nevada 350025-184684-01 denotes a 3500/25 Keyphasor (speed/phase reference) module paired with its matching rear I/O plate 184684-01. From my experience, this is the reference heartbeat for a 3500 rack—delivering precise once‑per‑turn phase and RPM to the other monitors and your data system. You might notice that keeping the OEM rear plate with the front module makes cabinet wiring predictable, shield terminations clean, and swap‑outs faster during tight outage windows.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in-stock; no more than 1 month at the latest
• Payment method: 50% advance payment; full payment for delivery
• Express delivery methods: FedEx, UPS, DHL

Key Features

• Precise phase and speed reference – Provides once‑per‑turn Keyphasor signals and RPM to the rack for diagnostics and protection logic.
• Dual‑channel capability – Module supports two Keyphasor inputs (typical for 3500/25) for redundancy or multi‑probe arrangements.
• Flexible transducer inputs – Works with proximity probe drivers and magnetic pickups commonly used on turbines, compressors, and gearboxes.
• Paired rear I/O (184684‑01) – Labeled screw terminals and shield/earth points keep terminations tidy and repeatable.
• Backplane integration – Powered by the rack; distributes phase/RPM data internally to 3500 monitors and the TDI (22M).
• Service‑friendly layout – Front plug‑in module, rear terminations—swaps are typically quick with minimal disturbance to adjacent cards.

Technical Specifications

Figures below reflect what’s commonly supplied for a 3500/25 Keyphasor module with the 184684‑01 rear plate. If you share your probe type and rack option string, we’ll confirm the exact fit before shipment.

Application Fields

• Turbines and compressors needing accurate speed and phase reference for protection and diagnostics
• Gearboxes and rolling equipment where phase‑synchronous vibration (1X/2X) analysis matters
• Balancing and run‑up/coast‑down testing with reliable once‑per‑turn timing
• Units standardizing 3500 racks across trains to simplify spares and procedures

Advantages & Value

• Reliability – Purpose‑built Keyphasor module with clear terminations reduces wiring mistakes and nuisance alarms.
• Compatibility – Native to the 3500 ecosystem; in many cases a direct, like‑for‑like replacement.
• Maintainability – Rear plate labeling and accessible terminals make loop checks and probe swaps faster.
• Cost control – Predictable form/fit shaves hours off commissioning and outage work in most cases.

Installation & Maintenance

• Probe setup – Set probe gap correctly; confirm clean keyway or target marker for a stable once‑per‑turn pulse.
• Wiring practice – Route Keyphasor leads away from high‑EMI sources (VFD outputs); maintain shield continuity to the designated point.
• Grounding – Follow single‑point grounding; use the rear plate earth lugs to avoid loops.
• Commissioning – Verify RPM reading and phase stability at low speed first; validate against handheld tach where possible.
• Routine care – Re‑torque terminals during PMs, inspect cable jackets, and review Keyphasor OK/status indicators.

Quality & Certifications

• CE and RoHS compliance (typical for Bently Nevada 3500 components)
• UL/cUL suitability for industrial control panels, model dependent
• Manufacturer’s warranty: 12 months from shipment

A quick field note we hear often: “After seating the 3500/25 and landing the probes on the 184684‑01 plate, RPM locked in immediately and phase was rock‑steady.” Share your probe type, desired channel mapping, and rack option string, and we’ll confirm this 350025‑184684‑01 pairing so your changeout is smooth on the first pass.