This module is designed for vibration and displacement monitoring in hazardous (explosion-prone) areas. It integrates built-in intrinsic safety barriers, internal terminals, and multi-channel signal conditioning to safely interface with field sensors while maintaining full compatibility with the 3500 system’s protection and diagnostic architecture.

Input Signal Types

Eddy current displacement probe signals

Velocity / acceleration sensor signals

Core Configuration

Integrated intrinsic safety barriers (explosion-proof design)

Internal terminals for direct sensor wiring

4 independent signal conditioning channels

Fully compliant with hazardous-area installation requirements

Measurement Functions

Radial vibration

Axial displacement (axial position)

Differential expansion

Eccentricity

Vibration velocity

Acceleration

Absolute shaft vibration

Other standard rotating machinery parameters

Outputs

Analog output: 4–20 mA

Digital alarm outputs:

Alert / Danger alarms

Fully compatible with 3500 system alarm logic

Interface & System Integration

Compatible with the 3500 system high-speed data bus

Supports hot swapping, allowing module replacement without shutting down the rack

Seamless integration with 3500 rack controllers and display modules

Power Requirements

Power supply: 3500 system rack power supply

+24 V DC

Power consumption: approximately 1.09 W

Environmental Specifications

Operating temperature: –30 °C to +65 °C

Storage temperature: –40 °C to +85 °C

Mechanical Characteristics

Dimensions (approx.): 191 × 130 × 19 mm
(length × width × thickness)

Weight (approx.): 0.22 kg

Typical Applications

Vibration and displacement monitoring in hazardous areas

Turbines, compressors, pumps, and motors in oil & gas facilities

Intrinsically safe machinery protection systems

Condition monitoring and predictive maintenance

BENTLY 3500/42 135489-01 Prox/Seismic I/O Module