3500/25 125792-01 Enhanced Dual Channel Keyphasor Module

BENTLY 3500/25 125792-01 (Enhanced Dual Channel Keyphasor Module)
3500/25 125792-01 is a half height, dual channel key phase module of Bently Nevada 3500 Mechanical Protection System (TSI), used to provide speed and phase references for rotating machinery, and is a core component for vibration monitoring and fault diagnosis.

1、 Basic Information
Model: 3500/25, Part Number: 125792-01 (Upgraded to 149369-01, completely replaced)
Channel: Dual channel (2 independent key phase inputs)
Form: Half height module, compatible with 3500 standard rack
Purpose: To provide Keyphasor signals for monitoring modules in the 3500 rack, used for measuring speed, phase, and 1X vibration vectors
2、 Core functions
Key phase signal acquisition: Receive input from eddy current/magnetic probes, convert the “key phase marks” on the shaft into digital pulses (once or multiple times per rotation).
Speed and Phase Reference: Provides precise timing for calculating shaft speed, 1X vibration amplitude/phase, and vector parameters.
System configuration capability:
General: Up to 4 key inputs
Pairing: Up to 8 key phase inputs (dual module redundancy)
TMR redundancy support: In triple redundant systems, dual modules are parallel and provide primary/backup key trust signals.
Backward compatibility: Compatible with the appearance/function of the old version key phase module and compatible with legacy systems.
3、 Technical specifications
Input: 2 channels, compatible with proximity probes/magnetic pickups
Output: Digital key phase pulse, for use by the monitoring module inside the rack
Size: Approximately 263 × 58 × 28 mm
Weight: Approximately 4.3 kg
Status indicator: OK, TX/RX indicator light (front panel)

4、 Application scenarios
TSI protection system for rotating machinery such as steam turbines, compressors, fans, generators, etc
Vibration monitoring, phase analysis, dynamic balancing, fault diagnosis
Precision monitoring scenarios requiring speed synchronization/phase reference
5、 Substitution and Compatibility
125792-01 → 149369-01 (direct replacement, compatible with functions/pins)
Can be compatible with modules such as 3500/20, 3500/22M, 3500/33 in the same rack