Module Description

Channel Configuration: 4 independent input channels

Measurement Type: Shaft absolute (axial) position measurement

Sensor Compatibility:

Bently Nevada 3300 series eddy current probes

Displacement sensors

Measurement Performance

Measurement Range: ± 2.5 mm (shaft displacement)

Resolution: 0.001 mm

Signal Processing: Integrated signal conditioning and filtering

Communication & Integration

System Interface: 3500 system bus

System Integration:

Communication with 3500 rack framework controller

Data exchange with upper-level systems (e.g. Plantweb)

Mechanical & Electrical Specifications

Installation: Bently 3500 standard rack

Module Type: Half-height module

Slot Occupancy: 1 slot

Power Supply: Provided by 3500 rack

+5 VDC, ±15 VDC

Power Consumption: Approx. 8 W

Environmental Conditions

Operating Temperature: 0 °C to +60 °C

Relative Humidity: 5%–95% (non-condensing)

Functional Capabilities

Shaft absolute position measurement

Real-time data acquisition and processing

Alarm limit comparison and protection logic

Fault diagnosis and system status monitoring

Product Lifecycle Status

Status: Legacy / Discontinued

Spare Parts Availability: No official new parts supply; market availability limited to dismantled or refurbished units

Core Functions & Application Scenarios
Shaft Absolute Position Monitoring

Receives signals from eddy current probes to measure radial and axial shaft displacement in real time. The module calculates the absolute shaft position, providing critical data for evaluating equipment operating conditions.

Data Processing & Alarm Protection

Built-in signal conditioning circuits and filtering algorithms process measurement data and compare it against preset alarm and trip thresholds. When limits are exceeded, the module can trigger alarms or initiate shutdown protection.

System Communication & Data Upload

Measurement data is transmitted to the rack controller via the 3500 system bus, enabling communication with upper-level monitoring and asset management systems such as Plantweb for remote monitoring and advanced data analysis.

Fault Diagnosis & Event Recording

Supports SOE (Sequence of Events) recording, logging fault occurrence time, type, and status changes to assist maintenance personnel in rapid fault localization and troubleshooting.

BENTLY 3500/42 138708-01 Shaft Absolute I/O Module

Typical Applications

Turbine shaft position monitoring in thermal power plants

Compressor shaft displacement protection in petrochemical facilities

Natural gas transmission pump unit monitoring

Fan shaft position control in metallurgical and heavy industrial applications