Product Introduction
The Bently Nevada 3500/25M (Part Number 149369-01) is an Enhanced Keyphasor Module for the 3500 Series monitoring system. It is designed to provide precise, once‑per‑revolution timing reference signals (Keyphasor outputs) from proximity probes or magnetic pickups. The “M” designation indicates an enhanced version with improved signal conditioning, higher noise immunity, and additional diagnostic capabilities compared to the standard 3500/25 module. The module accepts up to four transducer inputs and outputs up to four conditioned Keyphasor signals to other 3500 Series monitors (e.g., vibration, position, speed modules). It occupies a single slot in a 3500 rack.
Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 3500/25M 149369-01 |
| Product Type | Enhanced Keyphasor Module |
| Number of Input Channels | 4 (independent) |
| Number of Output Channels | 4 (buffered Keyphasor signals) |
| Input Signal Types | Proximity probe (3300 XL), magnetic pickup, or tachometer |
| Output Signal | Analog pulse (same shape as input, conditioned) |
| Module Slot Width | 1 full‑height slot in 3500 rack |
| Dimensions (W × H × D) | 24.9 × 241.3 × 218.4 mm (0.98 × 9.50 × 8.60 in) |
| Weight | 0.45 kg (1.0 lb) |
| Operating Temperature | 0 to +65 °C (32 to +149 °F) |
| Storage Temperature | –40 to +85 °C (–40 to +185 °F) |
| Input Impedance | 10 kΩ (typical) |
| Maximum Input Voltage | –24 Vdc to +24 Vdc |
| Accuracy | ±0.1% of full scale |
| Certifications (typical) | CSA, ATEX, IECEx – for safe area and hazardous area rack installations |
Application Scenarios
Phase Reference for Turbomachinery – Provides a stable Keyphasor signal to vibration monitoring modules (e.g., 3500/40, 3500/42) for accurate phase measurement, enabling diagnosis of unbalance, misalignment, and rotor bow on steam turbines, gas turbines, and compressors.
Speed Measurement and Overspeed Protection – Supplies high‑resolution speed signals to 3500/50 or 3500/53 modules for rotational speed monitoring and trip logic.
Multi‑Shaft Synchronization – Used on equipment with multiple rotors (e.g., back‑to‑back compressors, dual‑shaft gas turbines) where independent Keyphasor references are required for each shaft.
Starting/Coast‑Down Analysis – Supports bode plots, polar plots, and waterfall diagrams during machine startup and shutdown, helping engineers identify critical speeds and damping characteristics.
Replacement or Upgrade – Replaces standard 3500/25 modules in existing racks to gain improved noise rejection and self‑diagnostic features in critical installations such as refineries, power plants, and offshore platforms.
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
Why do so many customers choose us?
On the basis of the same quality, we provide:
- More competitive price system
- Faster logistics response
- More complete technical support (free product technical documentation)
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