Bently Nevada 3500/25-01-02-00 126648-01 Keyphasor I/O Module

Bently Nevada 3500/25-01-02-00 (Part Number: 126648-01): Description

The Bently Nevada™ 3500/25-01-02-00 (part number 126648-01) is a half-height, two-channel 

Enhanced Keyphasor Module designed for the 3500 Machinery Protection System. It serves as a 

critical timing and speed measurement component, receiving input signals from proximity probes or 

magnetic pickups and converting them into digital Keyphasor signals. These signals indicate when the 

Keyphasor mark on a rotating shaft aligns with the transducer, enabling 3500 monitor modules and 

external diagnostic equipment to measure shaft rotational speed and vector parameters (e.g., 1X 

vibration amplitude and phase).

Configured with the model suffix "01-02-00", this module features a single half-height 2-channel 

Keyphasor card (designated by "01"), a Proximitor I/O Module with External Terminations (designated 

by "02"), and no agency approval (designated by "00"). The external termination configuration 

requires separate ordering of external termination blocks and signal cables for complete installation. 

It maintains full form-fit-function downward compatibility with legacy Keyphasor modules, making it 

suitable for retrofits in existing systems, while offering enhanced features including once-per-turn 

event signal generation from multi-event-per-turn inputs, field-upgradeable firmware, and asset 

management data reporting.

The module supports parallel operation for Triple Modular Redundant (TMR) applications, where two 

modules work in tandem to provide primary and secondary Keyphasor signals to other rack modules. 

It features front-panel LEDs (OK and TX/RX) for real-time status monitoring—indicating module fault 

detection and communication with the Rack Interface Module (RIM). With isolated I/O options 

compatible with magnetic pickups and proximity probes (requiring an external power supply for the 

latter), it adapts to diverse industrial setups while complying with global safety and electromagnetic 

compatibility standards.

Key Parameters

Model & Part Number: 3500/25-01-02-00, 126648-01

Channel Configuration: Single half-height 2-channel Keyphasor card (supports 2 input channels)

I/O Module Type: Proximitor I/O Module with External Terminations (requires separate external termination blocks and cables)

Agency Approval: None (designated by "00")

Input Specifications:

Accepts signals from proximity probes or magnetic pickups.

Input signal range: +0.8 V to -21.0 V (non-isolated I/O); +5 V to -11 V (isolated I/O).

Input impedance: Minimum 21.8 kΩ.

Power consumption: Typical 3.2 Watts.

Magnetic pickups require minimum shaft speed: 200 rpm (3.3 Hz).

Speed/Frequency Ranges:

Input range: 1 to 1,200,000 cpm (0.017 to 20 kHz); supports multi-event-per-turn inputs up to 20 kHz.

Output range: 1 to 99,999 cpm (0.017 to 1667 Hz).

Accuracy (at +25°C/77°F):

Non-processed signals: ±1 cpm (0.017–100 Hz), ±8 cpm (101–500 Hz), ±1% of cpm (501 Hz–20 kHz).

Processed signals: ±1 cpm (0.017–60 Hz), ±8 cpm (61–150 Hz), ±1% of cpm (151 Hz–20 kHz).

Signal Conditioning:

Auto Threshold: Minimum triggering amplitude 2 V peak-to-peak, minimum frequency 120 rpm (2 Hz); usable for inputs above 0.017 Hz.

Manual Threshold: User-selectable 0 to -20 V dc; minimum triggering amplitude 500 mV peak-to-peak.

Hysteresis: User-selectable 0.2 to 2.5 V.

Output Specifications:

Buffered Keyphasor outputs: 2 front-panel coaxial connectors + 2 rear-panel Euro Style connectors.

Output impedance: Maximum 504 Ω.

Transducer power supply: -24 Vdc, 40 mA maximum per channel.

Physical Dimensions:

Main module: 119.9 mm × 24.4 mm × 256.5 mm (4.72 in × 0.96 in × 10.10 in), weight 0.34 kg (0.76 lbs).

I/O module: 241.3 mm × 24.4 mm × 103.1 mm (9.50 in × 0.96 in × 4.06 in), weight 0.46 kg (1.01 lbs).

Rack Space Requirements: 1 half-height front slot (main module), 1 full-height rear slot (I/O module).

Environmental Limits:

Operating temperature: -30°C to +65°C (-22°F to +150°F) (non-internal barrier I/O); 0°C to +65°C (32°F to +150°F) (internal barrier I/O).

Storage temperature: -40°C to +85°C (-40°F to +185°F).

Humidity: Up to 95% (non-condensing).

Certifications & Compliance: FCC Part 15; EU EMC Directive 2014/30/EU (EN 61000-6-2, EN 61000-6-4); EU LV Directive 2014/35/EU (EN 61010-1); RoHS Directive 2011/65/EU; maritime certifications (DNV GL, ABS).

Hazardous Area Compatibility: Compatible with hazardous area deployments when paired with approved I/O modules (Class I, Division 2/Zone 2 approvals available with appropriate configurations).

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