The 3500/45 Position Monitor is a four-channel position monitoring module within the Bently Nevada™ 3500 Machinery Protection System. It is designed to accept and condition signals from a wide range of position and displacement transducers, and to compare the resulting measurements against user-programmable alarm setpoints for machinery protection and condition monitoring.

Sensor Inputs

The 3500/45 supports multiple position sensor types, including:

Proximity transducers

Rotary Position Transducers (RPTs)

DC Linear Variable Differential Transformers (DC LVDTs)

AC Linear Variable Differential Transformers (AC LVDTs)

Rotary potentiometers

This flexibility allows the monitor to be applied to a wide variety of machine position measurement applications.

Core Functions
Machinery Protection

Continuously compares measured position parameters against configured:

Alert setpoints

Danger setpoints

Drives alarms to protect machinery from abnormal position or displacement conditions

Machine Condition Information

Provides essential position and displacement data for:

Operations personnel

Maintenance and reliability engineers

Channel Operation and Measured Variables

The monitor provides four independent measurement channels

Each channel, depending on its configuration:

Conditions the raw sensor input

Generates one or more measured variables

Alarm configuration:

Alert setpoints can be defined for each active measured variable

Danger setpoints can be assigned to any two active measured variables per channel

This flexible alarm structure allows the user to tailor protection and monitoring strategies to specific machine requirements.

Application Suitability

The 3500/45 Position Monitor is commonly used for monitoring:

BENTLY 3500/45 135137-01 Position Monitor

Valve position

Guide vane or actuator position

Shaft axial or radial position

Mechanical travel limits and displacement

It is well suited for critical rotating and reciprocating machinery requiring reliable position monitoring within the 3500 Series protection framework.