Half-Height Keyphasor Card | Bently Nevada 3500/25

Product Overview

The Bently Nevada 3500/25-01-01-00 functions as an Enhanced Keyphasor* Module within the 3500 Machinery Protection System. This half-height, dual-channel module processes raw signals from proximity probes or magnetic pickups to provide precise shaft speed and phase reference data. It generates the essential timing pulses required for synchronous vibration measurements and vector analysis. We supply this module as 100% Brand New and Original in Factory Packaging, ensuring your 3500 system maintains API 670-compliant diagnostics for turbines, compressors, and high-speed rotating assets.

Technical Specifications

The 3500/25-01-01-00 provides high-resolution timing pulses across a wide dynamic speed range.

Engineering Advantages

• Synchronous Analysis Baseline: The 3500/25-01-01-00 provides the "Once-Per-Turn" pulse required for Orbit, Polar, and Bode plots. This enables engineers to perform advanced diagnostics by identifying the exact phase angle of vibration peaks relative to shaft position.

• Redundant Input Architecture: The dual-channel design allows for redundant Keyphasor inputs. This ensures that the 3500 rack maintains a stable speed and phase reference even if one field probe or cable fails, preventing a loss of critical diagnostic data.

• Enhanced Noise Suppression: Integrated digital filtering and hysteresis control reject electrical noise and "ghost" pulses often caused by shaft surface imperfections. This ensures a clean, rock-steady timing pulse for the monitoring system.

• Internal Termination Convenience: The 125800-01 I/O module simplifies field wiring by utilizing internal terminations. This eliminates the need for external terminal blocks, reducing cabinet footprint and minimizing the risk of wiring errors during installation.

• High-Integrity Speed Tracking: The module tracks instantaneous speed with millisecond resolution. It facilitates overspeed and underspeed alarm triggering through the 3500 rack backplane, supporting critical safety interlocks for high-value turbomachinery.

FAQs

• What is the difference between this and the standard 3500/25 module?

  The 3500/25-01-01-00 is the "Enhanced" version, offering improved signal processing and higher noise immunity compared to earlier Keyphasor iterations, ensuring more reliable phase tracking in complex electrical environments.

• Does this module occupy a full slot in the 3500 rack?

  No. This is a half-height module. It fits into the top or bottom half of a standard 3500 rack slot, allowing you to maximize rack space by installing two half-height modules (such as two 3500/25 cards) in a single physical slot.

• Can I use a magnetic pickup as the input source?

  Yes. The 3500/25-01-01-00 accepts signals from both non-contact proximity probes (eddy current technology) and passive magnetic pickups, making it compatible with various machine designs.

• Is this module hot-swappable?

  Yes. Like other 3500 series cards, you can replace the 3500/25 while the system is under power. Note that removal will temporarily suspend synchronous data sampling and speed monitoring for the rack until the new module is initialized.