Bently Nevada 3500/25 149369-01 Enhanced Keyphasor Module
Technical Specifications
– Module type : half-height, dual-channel, occupies one front slot
– Input signal : proximity probe or magnetic pickup
– Non-isolated I/O : +0.8 V to –21 V
– Isolated I/O : +5 V to –11 V
– Input impedance : ≥ 21.8 kΩ
– Output signal : digital keyphasor pulse, buffered coax on front & Euro connector on rear
– Speed range : 0 – 99 999 RPM (passive mag pickup requires >200 RPM)
– Accuracy : ±0.05 %
– Resolution : 0.1 RPM
– Sampling rate : 1 kHz per channel
– Phase shift : <1° typical (non-isolated), <3° isolated
– Output impedance : ≤504 Ω
– Power supply : –24 Vdc from rack back-plane, 40 mA max per channel
– Power consumption : 3.2 W typical
– On-board memory : 32-bit RISC processor, flash for firmware & event log
– MTBF : >300 000 h @ 45 °C per MIL-HDBK-217F
– Operating temperature :
– Non-isolated : –30 °C to +65 °C
– Isolated : 0 °C to +65 °C
– Storage temperature : –40 °C to +85 °C
– Humidity : 95 % RH non-condensing
– Shock / vibration : 15 g 11 ms; 2 g 5 – 500 Hz operational
– Dimensions : 119.9 mm × 24.4 mm × 256.5 mm
– Weight : 0.34 kg (0.76 lb)
– Agency approvals : CE, UL/cUL Class I Div 2, ATEX/IECEx Zone 2, RoHS, ABS marine
– Dual-channel front-end – each channel accepts one magnetic or eddy-current sensor; generates independent keyphasor pulses
– Multi-event mode – software-selectable to output single pulse or preserve every input event for gear-train analysis
– Redundant & TMR ready – two modules run in parallel to supply primary/secondary keyphasor signals; supports triple-modular-redundant racks
– Paired expansion – up to four modules (eight channels) in one rack for large steam turbines with multiple keyways
– Hot-swappable – insertion/extraction under rack power without interrupting protection or measurement
– Field firmware – upgrade via System 1 or Ethernet in <3 min; rollback image stored for safety
– Asset management – onboard diagnostics report sensor gap, signal level, cable integrity and module health over the same network link
– Downward compatible – drop-in replacement for legacy PWA 125792-01 and 149369-01 modules; no re-wiring required
– Steam-turbine TSI cabinets – provides speed and phase reference for eccentricity, differential expansion and vibration vector plots
– Gas-turbine packages – redundant keyphasor signals feed GE Mark VIe or Siemens SPPA-T3000 for speed control and surge protection
– LNG refrigeration compressors – multi-event mode captures gear-mesh harmonics for early tooth-fault detection
– Offshore platform centrifugal compressors – Zone-2 certification allows direct mounting in hazardous junction boxes
– Ethylene hyper-compressors – 0.1 RPM resolution detects very slow roll during start-up to prevent bearing wipe
– Pipeline pump drives – IRIG-B time-stamped keyphasor pulses align multiple racks along 500 km right-of-way
– Wind-turbine test stands – high-speed Ethernet streams real-time speed and phase data to LabVIEW for modal analysis
– Nuclear feed-water pumps – TMR configuration meets IEEE 338 requirements for safety-related speed and vibration monitoring
The module slides into any half-height front slot; rear-mounted I/O card (125800-01) provides coax and Euro-style connectors.
Front LEDs indicate channel health, keyphasor activity and module status.
Sensor gap voltage and pulse amplitude are continuously monitored; alarms are generated for open or shorted cables.
Replacement takes <1 min; all rack parameters remain stored non-volatilely on every monitor, so no re-configuration is necessary.
Fully compatible with all 3500 monitors (3500/40M, 3500/42M, 3500/44M, 3500/45, 3500/46M, 3500/50, 3500/60, 3500/62, 3500/70M, 3500/72M, 3500/77M, 3500/90, 3500/92, 3500/93).
Supported by System 1 v6.5 onward and by third-party OPC UA, Modbus and DNP3 clients.
3500/25-01-01-01 149369-01 – Standard dual-channel keyphasor module, copper Ethernet, conformal coat
3500/25-01-02-01 149369-01 – As above plus isolated I/O
3500/25-02-01-01 149369-01 – TMR version for triple-redundant racks
3500/25-AXX-BXX-CXX – Full modular option table for cable length, firmware revision and hazardous-area certification
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