1. BENTLY 3500/25 184684-01 | Traceable Protection Hardware

2. Unboxing & Physical Snapshot

• Brand & Model: Bently Nevada 3500/25 184684-01 Enhanced Keyphasor Module
• Product Type: Half-height Keyphasor interface module for the Bently Nevada 3500 Machinery Protection System. The module provides shaft reference timing signals used for phase measurement, speed calculation, and advanced rotating machinery diagnostics.
• Approximate Physical Dimensions (W × H × D): Approximately 119.9 × 24.4 × 256.5 mm (4.72 × 0.96 × 10.10 in.) for the main module assembly.
• Estimated Shipping Weight: Approximately 0.34 kg (0.76 lb) for the main module; packaged shipment weight will increase with ESD protection and cushioning.
• What’s in the Box:
  • Bently Nevada 3500/25 184684-01 Enhanced Keyphasor Module
  • Front panel assembly with status indicators
  • VME-style rack interface connector
  • Protective ESD shielding bag
  • OEM identification label and serial tracking information
  • Documentation when supplied with original packaging

3. Product Introduction

Structure B — Architecture Hook

The Bently Nevada 3500/25 184684-01 installs into a 3500 rack as a dedicated timing interface module between rotating equipment sensors and the machinery protection system. It occupies a half-height module position and communicates through the rack backplane, where alignment of the card guides and connector engagement directly affects signal integrity (critical during turbine and compressor monitoring applications).

This module receives Keyphasor signals from proximity probes or magnetic pickups and converts shaft reference pulses into digital timing information used by 3500 monitor modules. The resulting reference data supports speed measurement, phase analysis, and vibration diagnostics for rotating machinery. Inspect the front connector area, card edge contacts, and module faceplate before installation; stored spares often fail from handling damage rather than electronic defects.

4. Core Technical Specifications

Parameter	Value
Manufacturer	Bently Nevada
Model Number	3500/25 184684-01
Product Type	Enhanced Keyphasor Module
System Platform	3500 Machinery Protection System
Module Height	Half-height module
Channels	Two Keyphasor channels per module
Input Sources	Proximity probes or magnetic pickups
Signal Conversion	Analog Keyphasor pulse to digital timing signal
Input Frequency Range	0.017 Hz to 20 kHz
Output Range	0.017 Hz to 1667 Hz
Power Consumption	Approximately 3.2 W typical
Buffered Output Impedance	Maximum approximately 504 Ω
Operating Temperature	-30°C to +65°C (configuration dependent)
Storage Temperature	-40°C to +85°C
Humidity Rating	Up to 95% RH, non-condensing
Rack Compatibility	Bently Nevada 3500 rack system

BENTLY 3500/25 184684-01

Specifications should be confirmed against the installed rack configuration and I/O module type before replacement approval.

5. ? Global Compliance & Industry Certifications

Expected regulatory approvals and compliance considerations for this machinery protection module include:

• CE Mark — indicates conformity with applicable European EMC and safety requirements when installed as part of an approved system.
• UL/cUL Listed or Recognized — may apply depending on the complete 3500 system configuration.
• IEC 61010 / industrial equipment safety considerations — applicable depending on system evaluation.
• RoHS Compliance — production revision dependent.
• ATEX/IECEx compatibility — available for certain 3500 system installations using approved barriers or isolators.
• Marine approvals (DNV GL) — only applicable to specifically qualified system packages.

The 3500 system supports hazardous-area installations through approved intrinsic safety interfaces and barriers. This matters because the protection system may be installed near combustible process equipment where ignition control is part of the site safety strategy.

Verify specific lot certifications with OEM.

6. ? Long-Term Storage & Asset Preservation Guide

Keep the 3500/25 184684-01 sealed in its original anti-static (ESD) shielding bag. The card edge contacts and internal components should remain protected from airborne contaminants, especially sulfur compounds and salt exposure found near process plants.

Maintain warehouse humidity below 60% RH. Connector oxidation is the primary storage concern for legacy VME-style industrial modules (a small amount of surface contamination can produce intermittent rack communication faults).

Inspect the module before installation after extended storage. Check the retaining clips, front bezel, connector fingers, and PCB surface for corrosion or mechanical stress. If the module has been stored for many years, perform a rack-level functional check before placing it into a critical protection loop.

7. Physical Installation Prerequisites

• Install only in a compatible Bently Nevada 3500 rack.
• Verify rack slot assignment before insertion.
• Ensure the module card guides are clean and correctly aligned.
• Maintain cabinet airflow with approximately 50 mm clearance around ventilation paths where practical.
• Confirm chassis grounding and protective earth continuity.
• Inspect the rack backplane connector before installation.
• Secure front retaining hardware to prevent vibration-related movement.

The module should slide smoothly into the rack. Never force insertion because damaged backplane contacts can create difficult-to-diagnose protection system faults.

8. Buyer’s FAQ (Logistics & Compliance Focus)

Q1. What HS Tariff Code is commonly used for the Bently Nevada 3500/25 184684-01?

A: The final Harmonized System classification depends on the importing country and declared function. Machinery protection modules are commonly reviewed under electrical control and instrumentation categories, but the customs broker should confirm the final HS code before export documentation is prepared.

Q2. Does Country of Origin affect acceptance of this spare module?

A: Yes. COO documentation may affect import duties, trade agreement eligibility, and customer audit requirements. Keep supplier declarations, serial number records, and original labels with the asset history file.

Q3. Is shipping insurance necessary for this Keyphasor module?

A: Recommended. The module is lightweight, but impact damage can affect the connector assembly, PCB solder joints, or front-panel components. Use ESD packaging, shock protection, and declared replacement-value coverage.

Q4. Does the 3500/25 184684-01 include the latest firmware pre-loaded?

A: Firmware status depends on the manufacturing revision and previous service history. Before installation, verify the module revision, rack configuration, and approved system baseline. The 3500/25 operates as part of the rack protection system and must match the existing configuration.