Introduction
The 3500/50 133442-01 is a specific version of the Keyphasor® Module within the Bently Nevada 3500 Machinery Protection System. Its primary function is to process the signal from a single Keyphasor transducer (typically an eddy-current proximity probe, magnetic pickup, or optical sensor). This module generates a clean, once-per-revolution timing pulse that is critical for phase reference in vibration measurements. It provides speed information, enables synchronous vibration analysis (for identifying unbalance, misalignment), and acts as a trigger for transient data capture during startup and shutdown.
Key Parameters
The following table summarizes the key technical and physical specifications for this module.
| Parameter Category | Specification |
|---|---|
| Model / Part Number | 3500/50 (133442-01) |
| Primary Function | Single-Channel Keyphasor (Speed & Phase Reference) Signal Conditioner and Monitor. |
| Input Type | Compatible with eddy-current probes, magnetic pickups, or other speed sensors providing a once-per-revoltion pulse. |
| Input Signal Range | Typically accepts a wide range of input voltages and frequencies corresponding to machine operating speeds. |
| Key Outputs | • Speed Indication (RPM) • Clean Keyphasor Pulse (distributed to other monitor modules in the rack) • Programmable Alarms for overspeed, underspeed, or signal loss. |
| Power Supply | Powered from the 3500 rack backplane (+24 VDC). |
| Operating Temperature | -30°C to +65°C (standard for 3500 series). |
| Dimensions (H x W x D) | Standard 3500 Series Module Size: 190 mm (H) x 50 mm (W) x 170 mm (D) (Occupies one slot in a 3500 rack). |
| Weight | Approx. 0.5 kg - 0.7 kg (module only). |
| Mounting | Installed in a designated slot of a 3500 rack or frame. |
*Note: The specific input conditioning (e.g., sensitivity, trigger levels) is configurable via software to match the connected sensor. Always refer to the official *Bently Nevada 3500/50 Keyphasor Module* documentation for the exact 133442-01 revision specifications for critical applications.*
Application Scenarios
The Keyphasor module is a fundamental component for any rotating machinery monitoring system that requires phase-related diagnostics and accurate speed measurement.
Synchronous Vibration Analysis:
Provides the essential phase reference for vibration modules (like the 3500/42). This enables the creation of orbit plots and Bode/ Nyquist plots, which are indispensable for diagnosing unbalance, misalignment, and structural resonance.
Overspeed Protection:
Continuously monitors rotational speed and can be configured to trigger a Danger alarm and initiate an emergency shutdown via a relay module (like the 3500/20) if a preset overspeed limit is exceeded, protecting turbines and compressors from catastrophic failure.
Startup/Shutdown Transient Capture:
The Keyphasor pulse is used as the trigger for transient data interfaces (like the 3500/15) to capture vibration data during machine run-ups and coast-downs, allowing for detailed analysis of critical speeds and dynamic behavior.
Speed Indication and Control:
Provides a reliable, hardwired speed signal for control room indication, logging, and integration into the plant's Distributed Control System (DCS).
Industry-Wide Critical Machinery:
Steam & Gas Turbines: Mandatory for balancing, alignment checks, and protection.
Centrifugal Compressors: Used for surge control systems and performance calculations.
Large Motors, Pumps, and Fans: Provides speed verification and phase data for condition assessment.
Hydro and Wind Turbines: Monitors rotational speed for performance and protection.
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