Model Interpretation

3500/25‑AXX‑BXX‑CXX

3500/25: Base model (Enhanced Keyphasor Module)

AXX: Channel configuration

01: Single half‑height (2 channels)

BXX: I/O module type

01: Non‑isolated I/O

02: Isolated I/O

03: Internal barrier I/O (intrinsically safe)

CXX: Approvals

00: None

01: CSA/NRTL/C

02: ATEX/IECEx/CSA (Class 1, Zone 2)

Common part numbers: 3500/25‑01‑01‑00, 149369‑01 (replaces older 125792‑01).

Technical Parameters

Mechanical

Form Factor: Half‑height, single‑slot

Dimensions (H×W×D): 119.9 mm × 24.4 mm × 256.5 mm

Weight: ~0.34 kg

Installation: Any empty half‑height slot in 3500/05 rack

Inputs (2 independent channels)

Transducer Types: Proximity probes (eddy‑current), magnetic pickups (passive/active)

Signal Range:

Non‑isolated: +0.8 V to −21.0 V

Isolated: +5 V to −11 V

Input Impedance: ≥21.8 kΩ

Threshold: Auto (2 V p‑p min) or manual adjustment

Speed Range: 200 rpm–20,000 rpm (passive magnetic pickup ≥200 rpm)

Outputs

Buffered Keyphasor: −24 VDC, 40 mA max per channel, 504 Ω impedance

Front‑Panel LEDs: OK, CH1, CH2 (status & fault indication)

Power & Environmental

Power Consumption: ~3.2 W (from rack backplane, −24 VDC)

Operating Temp: 0°C to +65°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% non‑condensing

Vibration/Shock: Industrial‑grade (IEC 60068)

Core Functions

Deliver precision Keyphasor pulses for 1X amplitude/phase, speed, and vector monitoring.

Support automatic/manual threshold for reliable triggering with varying signal amplitudes.

Provide 2 independent channels for dual‑sensor redundancy or multi‑shaft monitoring.

Enable time‑synchronous data capture across all monitors for accurate vibration analysis.

Offer backward compatibility with legacy Keyphasor modules (form, fit, function).

Hot‑swappable for replacement without system shutdown (redundant power recommended).

Applications

Power Generation: Gas/steam turbines, generators (phase‑locked vibration, balancing).

Oil & Gas: Compressors, pumps, fans (speed/phase monitoring, torsional vibration).

Petrochemical/Refining: Critical rotating machinery (vector monitoring, fault diagnostics).

Heavy Industry: Pulp & paper, mining, metallurgy (large rotating assets, balancing).

Safety‑Critical Systems: TMR installations requiring precise phase reference.

Usage & Maintenance

Installation: Insert into any half‑height slot; connect transducer cables to rear I/O.

Configuration: Use 3500 Configuration Software to set threshold, input type, and channel parameters.

Maintenance: Inspect connectors annually; no fans or consumables.

Status: Active; supported by Baker Hughes with full spare parts availability.