Product Overview

• PN: 3500/42M, Part No: 140734-99
• Brand: Bently Nevada (Baker Hughes)
• Series: 3500 Turbomachinery Protection System
• Type: Multi-Function 4-Channel Proximitor & Seismic Monitor Front Module

• Function: Core programmable monitoring unit for the 3500 rack system. It supplies excitation power to 3300XL eddy current probes, processes signals from velocity transducers and piezoelectric accelerometers. Via official configuration software, each channel can be set to measure radial vibration, thrust displacement, differential expansion, eccentricity, shaft absolute vibration and acceleration. It triggers Alert and Danger hardwired trip alarms, outputs 4-20mA analog signals, and uploads real-time data to rack communication modules. Protection logic operates independently even when rack communication fails.

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Core Features

• 4 fully independent programmable channels, mix of sensor types allowed within one module
• 4 front-panel BNC test ports for on-site signal debugging without system shutdown
• Comprehensive built-in self-diagnosis to detect probe open circuit, short circuit and wiring faults
• LED status indicators for module health, channel status and alarm events
• Supports hot swapping under dual redundant rack power supply configuration
• High-precision signal filtering and integration for velocity/acceleration conversion
• Complies with API 670 standard, available with SIL2 safety certification

• Matches dedicated rear I/O terminal board for field wiring termination

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Technical Specifications

• Typical Power Consumption: 7.7 W
• Operating Temperature: 0℃ ~ +65℃
• Frequency Response: 0–10kHz for vibration, 0–1kHz for displacement
• Measurement Accuracy: ±0.1% full scale at 25℃
• Overall Dimension: 241.3 × 24.4 × 241.8 mm
• Net Weight: 0.91 kg
• HS Code: 8538900000
• Certifications: CE, UL, CSA, ATEX Zone 2, FM

• Product Status: OEM discontinued; brand new sealed and fully inspected refurbished units in stock

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Compatibility

• Matching Rear I/O Board: Exclusive dedicated rear terminal module for standard 3500/42M
• Applicable Chassis: All 3500/05 12-slot and 14-slot rack frames
• Supported Sensors: 3300XL proximity probes, 9200 series velocity sensors, ICP accelerometers
• Compatible Software: 3500 rack configuration tool, Bently Nevada System 1 predictive maintenance platform

• Incompatible: Cannot pair with intrinsic safety rear I/O boards designed for 3500/44M

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Application

• Rotor vibration, thrust position and differential expansion safety protection for steam turbines, gas turbines and centrifugal compressors in power and petrochemical industries
• Online condition monitoring and fault early warning for large critical rotating equipment
• Spare part replacement and system retrofit for legacy 3500 series TSI monitoring racks