Product Overview

The Bently Nevada 135137-01 is a high-precision Position I/O Module designed for the 3500 Machinery Protection System. This module acts as the critical rear interface for position monitoring cards (such as the 3500/45 or 3500/42M when configured for position), facilitating the connection of proximity probes and transducers used to measure thrust (axial) position, valve position, or differential expansion. Featuring internal terminations, the 135137-01 allows field wiring to be landed directly onto the module's screw terminals, eliminating the need for external terminal strips and significantly reducing cabinet complexity. It provides the necessary signal conditioning and surge protection required to maintain the integrity of sensitive position data in harsh industrial environments.

Key Technical Characteristics and Hardware Parameters

The 135137-01 is engineered for long-term stability and high-accuracy measurement of shaft and valve displacement.

• Model Number 135137-01

• Module Type Position I/O Module with Internal Terminations

• Compatibility Designed for use with Bently Nevada 3500 Position Monitor Main Modules

• Termination Style Integrated screw-type terminal blocks for direct field wiring

• Measurement Support Thrust Position, Differential Expansion, Eccentricity, and Valve Position (LVDT/RVDT)

• Signal Integrity Built-in isolation and transient protection to mitigate EMI/RFI interference

• Operating Temperature -30°C to +65°C (-22°F to +150°F)

• Mounting Location Occupies a rear I/O slot in the standard 3500 rack chassis

• Transducer Inputs Supports 3300 XL 8mm, 11mm, and 25mm proximity probe systems

• Physical Weight 0.96 kg

• Dimensions 2.5 x 18.5 x 14 cm

Industrial Applications and Operational Use Cases

This module is a staple in Turbine Supervisory Instrumentation (TSI) strategies where precise mechanical clearances must be monitored to prevent metal-to-metal contact.

• Axial Thrust Monitoring Continuously tracking the shaft position of steam and gas turbines relative to the thrust bearing to detect excessive wear or imminent failure.

• Differential Expansion Measuring the relative growth between a turbine rotor and its casing during startup and shutdown thermal cycles to prevent internal rubbing.

• Valve Position Indication Providing high-accuracy feedback of governor or throttle valve positions to the plant DCS for optimized steam flow control.

• Hydro-Generator Surveillance Monitoring the axial float and thermal expansion of large vertical water turbines.

• Boiler Feed Pump Protection Tracking thrust clearances in high-pressure pumps to ensure operational safety under varying load conditions.

By implementing the 135137-01, industrial facilities benefit from a streamlined installation process and a highly reliable data path that ensures machinery remains within safe mechanical tolerances.