Model Interpretation

3500/42M‑AXX‑BXX

3500/42M: Base model (4‑channel Proximitor/Seismic monitor)

AXX (I/O Type):

01: Internal terminations

02: External terminations

03: Internal barriers + internal terminations (intrinsically safe)

04: TMR with external terminations

BXX (Approvals):

00: None

01: CSA/NRTL/C

02: ATEX/IECEx/CSA (Zone 2)

Common part numbers: 140734‑02, 3500/42M‑01‑00.

Technical Parameters

Mechanical

Form Factor: Full‑height, single‑slot

Dimensions (H×W×D): 241 mm × 24.4 mm × 242 mm

Weight: ~0.91 kg

Installation: Any full‑height slot in 3500/05 rack

Inputs (4 Channels, Configurable Pairs)

Proximity Inputs: Bently Nevada 3300/3300XL series (5/8/11 mm probes); −24 VDC bias; 10 kΩ impedance

Seismic Inputs: Velomitors (velocity) or accelerometers (acceleration); 10 kΩ impedance

Frequency Response: 0.5 Hz–10 kHz (sensor/filter dependent)

Resolution: 24‑bit ADC; Accuracy: ±0.33% FS (typical)

Measurement Ranges

Radial Vibration: 0–500 μm (0–20 mils)

Axial Displacement: ±2 mm (±80 mils)

Differential Expansion: 0–25 mm (0–1000 mils)

Eccentricity: 0–500 μm (0–20 mils)

Velocity: 0–50 mm/s (0–2 in/s)

Acceleration: 0–50 g (peak)

Outputs

Buffered Transducer Outputs: 4 × BNC (short‑circuit protected, 550 Ω impedance)

4–20 mA Analog Outputs: 4 channels (scaled to measurement)

Alarm/Trip: Alert + Danger per channel (configurable logic)

Power & Environmental

Power Consumption: ~7.7 W (from rack backplane, −24 VDC)

Operating Temp: −30°C to +65°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% RH, non‑condensing

Vibration/Shock: 1.5 g (5–500 Hz), 15 g (11 ms)

Status LEDs: OK, Alert, Danger (per channel); Bypass, Fault

Core Functions

Dual‑Technology Monitoring: Simultaneously process proximity (displacement) and seismic (velocity/acceleration) signals, eliminating need for separate modules.

4‑Channel Flexible Configuration: Channels paired (1/2, 3/4) for independent function setup (e.g., 2×vibration + 2×thrust).

Comprehensive Measurements: Radial vibration, thrust position, DE, eccentricity, REBAM, acceleration, velocity, shaft absolute, circular acceptance region.

Dual Alarm Thresholds: Software‑configurable Alert (warning) and Danger (trip) per channel with hysteresis.

Buffered Probe Outputs: BNC ports for oscilloscope/diagnostic tools (raw sensor signal).

4–20 mA Scaled Outputs: Interface with DCS/PLC for remote monitoring and data logging.

Built‑In Diagnostics: Probe/cable fault detection, module self‑check, and fault logging.

Hot‑Swappable: Replace without rack shutdown (redundant power recommended).

TMR Compatibility: Support triple modular redundancy for high‑safety applications (SIL 2).

Applications

Power Generation: Steam/gas turbines, generators (shaft vibration + casing vibration monitoring).

Oil & Gas: Centrifugal compressors, pumps, blowers (combined shaft/casing protection).

Petrochemical/Refining: High‑speed rotating equipment (dual‑sensor monitoring in limited rack space).

Heavy Industry: Pulp & paper, mining (large motors/turbines with mixed displacement/velocity needs).

Safety Systems: SIS/ESD requiring vibration‑based trip logic with diverse sensor types.

Usage & Maintenance

Installation: Insert into full‑height slot; wire proximity/seismic cables to rear terminals; connect BNC/buffered outputs.

Configuration: Use 3500 Configuration Software (v3.3+); set channel type, measurement, range, thresholds, and output scaling.

Maintenance: Inspect cables/connectors annually; calibrate every 2–3 years; no internal consumables.

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