Bently Nevada 3500/25-01-01-00
Full name: Enhanced Keyphasor Module Enhanced Dual Channel Keyphasor Module
Baker Hughes 3500 TSI unit protection system, providing phase reference pulse signal

Physical 3500/25 module
1、 Model code analysis 3500/25-01-01-00
3500/25: Enhanced Keyphasor Module
Paragraph 1 01: Single half height card, 2-channel standard configuration
Second paragraph 01: I/O Rear Card Type=Built in Terminal Internal Termination
Third paragraph 00: No additional agency certification options available
✅ Matching of complete sets of parts (core procurement)
Front card body: 149369-01
Supporting rear I/O terminal module: 125800-01
⚠️ The front and rear cards must be matched in sets; External terminals and isolated I/O boards cannot be mixed
2、 Core functional positioning
3500/25 dedicated output Keyphasor phase reference pulse
Receive 3300XL eddy current key phase probe/magnetic resistance speed sensor signal
Regulate and generate standard key phase pulses, supply to the rack: 3500/40M, 42M vibration cards, 3500/22M (TDI)
Used to calculate the amplitude, phase, axis trajectory, and start stop map of vibration harmonics, it is an essential reference for rotor fault diagnosis
Simultaneously output the speed value and upload it to the system and DCS
Two BNC buffer keys on the front panel, which can be used for external acquisition devices
📌 Easy to confuse and distinguish: 3500/25 vs 3500/50M
|Model | Core positioning | Can it be used for speed alarm interlocking|
|—-|—-|—-|
|3500/25 | Keyphase Reference Generator (Priority Phase) | Only outputs speed values, without high/low speed, reverse, or zero speed alarm logic, not used for interlock protection|
|3500/50M | Dual channel speed monitor | Equipped with speed over limit, reverse, and zero speed alarms, can participate in unit interlocking; Not suitable as a high-precision phase reference|
Conventional engineering plan:
Need spectrum/phase analysis → equipped with 3500/25;
Need speed alarm, zero speed, reverse protection → matched with 3500/50M.

3、 Key hardware parameters
Channel: 2 independent sensor inputs
Sensor power supply: 24VDC per channel, maximum 40mA
Measurement range: 1~1200000 RPM (0.017~20kHz)
Trigger mode: automatic threshold/manual threshold optional
Power consumption: Typical 3.2W, powered by the backplane
Size: Half height card, 3500/05 rack single slot, supports hot swapping
Indicator light: OK, TX/RX communication status
Working temperature: -30 ℃~+65 ℃
4、 Differentiation among versions of the same series
3500/25-01-01-00:125800-01 Built in non isolated terminal (commonly used in this section)
3500/25-01-02-00: External Euro Terminal I/O
3500/25-01-03-00: Built in terminals with isolation barriers, suitable for magneto resistive pickup scenarios
5、 Lifecycle information
Original factory standard supply model; New original and disassembled testing spare parts are available in the market
Warranty reference: Brand new original 12 months, disassembled spare parts 3-6 months

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