The Bently Nevada 3500/25M Enhanced Keyphasor Module is a half-height, two-channel module that converts inputs from proximity probes or magnetic pickups into digital Keyphasor signals for 3500 rack monitors, supporting up to four signals in standard or eight in paired configurations. It improves signal processing over the previous design while remaining fully compatible with legacy systems, replacing the older PWA 125792-01 module with the updated 149369-01 version.
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The Bently Nevada Enhanced Keyphasor Module is a half-height, two-channel module that provides Keyphasor signals to monitor modules in a 3500 rack. It receives inputs from proximity probes or magnetic pickups and converts them into digital Keyphasor signals, indicating when the Keyphasor mark on the shaft aligns with the transducer. The 3500 Machinery Protection System can accept up to four Keyphasor signals in a standard configuration and up to eight in a paired configuration.
This Enhanced Keyphasor Module improves on the previous design by offering expanded signal processing capabilities while remaining fully compatible in form, fit, and function with existing Keyphasor modules. It replaces the older PWA 125792-01 module with the updated 149369-01 module, ensuring seamless integration into legacy systems.
Dual Keyphasor signal channels for rotor timing
Accepts inputs from proximity probes or magnetic pickups
Wide frequency range up to ~1,200,000 CPM (20 kHz)
Auto/manual threshold with selectable hysteresis
Buffered Keyphasor outputs via front and rear connectors
Supplies transducer power (–24 V, 40 mA per channel)
Enhanced signal processing, improved over earlier modules
Fully compatible with legacy 3500 Keyphasor modules
Low power consumption (~3.2 W)
Power consumption: ~3.2 W typical
Input signal range: +0.8 V to –21.0 V (non‑isolated I/O), +5 V to –11 V (isolated I/O)
Input impedance: ≥ 21.8 kΩ
Speed/frequency range: 1 to 1,200,000 CPM (0.017 Hz to 20 kHz)
Output range: 1 to 99,999 CPM (0.017 Hz to 1667 Hz)
Accuracy: ±1 CPM at low speed; ±1 % at high frequency
Trigger threshold: Auto ≥ 2 V p‑p; manual 0 to –20 V (min 500 mV p‑p)
Hysteresis: 0.2 to 2.5 V selectable
Buffered outputs: Two front (coaxial) and two rear (Euro) buffered Keyphasor outputs
Output impedance: ≤ 504 Ω
Transducer supply: –24 V DC, 40 mA per channel
Operating temperature: –30 °C to +65 °C (–22 °F to +150 °F)
Storage temperature: –40 °C to +85 °C (–40 °F to +185 °F)
Humidity: Up to 95 % non‑condensing
Physical dimensions (main): 119.9 × 24.4 × 256.5 mm (4.72 × 0.96 × 10.10 in)
Weight (main): ~0.34 kg (0.76 lb)
This is a reference configuration for the Bently Nevada 3500/22M Data Interface Module. It represents one commonly supplied setup and helps customers understand how the part number is structured.
Each X / XX in the part number indicates a selectable option that can be customized based on your application requirements such as Number of Channels, I/O Module Type & Approvals.
✅ Important: Final part number depends on the exact configuration needed for your machinery, environment, and monitoring system.
The Bently Nevada 3500/25 Enhanced Keyphasor Module is commonly used in monitoring and managing rotating machinery, including:
Providing accurate Keyphasor signals to 3500 rack monitors
Converting inputs from proximity probes or magnetic pickups into digital timing references
Supporting rotor speed, phase, and position monitoring
Enabling paired configurations for multiple Keyphasor channels
Supplying power to active transducers
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