Bently Nevada 3500/20 125744-01 TMR Rack Interface Module

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Bently Nevada 3500/20, part number 125744-01, is the TMR Rack Interface Module (RIM) designed exclusively for the Bently Nevada 3500 series machinery protection and condition monitoring rack system, widely deployed for critical rotating machinery protection across oil & gas, power generation, petrochemical, pulp and paper, and heavy industrial plants worldwideBaker Hugh…. This TMR version of the 3500/20 serves as the central rack communication and configuration hub while delivering triple modular redundant channel comparison for high-integrity safety applications compliant with API 670 machinery protection standardsBaker Hugh….

The 125744-01 must be fitted into Slot 1 of the 3500 rack, right beside the rack power supply. Every 3500 rack requires one RIM module. It is important to note that the rack interface module sits outside the critical monitoring trip path; communication faults or RIM failures will not interfere with core vibration, displacement, speed and overspeed protection functions of the monitoring rack, avoiding unwanted machine trips and protecting production uptime.

Beyond all standard RIM capabilities including rack configuration, local diagnostics, data retrieval and alarm management, this TMR variant adds continuous monitor channel voting and comparison. It constantly cross-checks measurement outputs from three redundant monitoring channels. When one monitor’s readings deviate beyond the preset threshold from the other two healthy channels, the module flags the faulty unit, logs the event inside the system event list and triggers corresponding status indicators for maintenance teams to locate faults rapidly.

For data communication, the Bently Nevada 3500/20 125744-01 supports Bently proprietary serial protocols, RS-232 and RS-422 interfaces, and works seamlessly with external communication processors including TDXnet, TDIX and DDIX. Engineers can connect engineering workstations, local operator panels and plant supervisory systems to download rack configuration, pull real-time machinery health data, review event logs and run routine system diagnostics without interrupting online machine protection operations. Front-panel LED status indicators provide instant visual feedback for power status, communication activity and TMR comparison faults, simplifying on-site troubleshooting during commissioning or scheduled inspections.

Key Features

• TMR triple modular redundant architecture for safety-critical machinery protection setups
• Integrated three-channel monitor comparison and voting function for fault detection
• Primary rack interface for full 3500 rack configuration, diagnostics and data acquisition
• Compatible with TDXnet, TDIX, DDIX Bently communication processors
• Non-intrusive to the critical protection trip path to prevent false trips
• RS232 / RS422 serial communication ports for local and multi-rack daisy-chain connection
• Front LED status indication for quick on-site fault diagnosis
• Designed to operate reliably in harsh industrial control cabinet environments
• Fully compatible with the complete 3500 series monitor modules, power supplies and backplanes
• Meets API 670 industry specification for online machinery protection systems

Technical Specifications

• Model: 3500/20
• Part Number: 125744-01
• Type: TMR Rack Interface Module (RIM)
• Brand: Bently Nevada (Baker Hughes)
• Installation Position: Slot 1, adjacent to rack power supply
• Typical Power Consumption: 4.75 W
• Operating Temperature Range: -30°C to +65°C
• Maximum Humidity: 95% relative humidity, non-condensing
• Physical Dimensions: 241.3 mm × 24.4 mm × 241.8 mm
• Net Weight: 0.91 kg
• Communication: RS-232, RS-422, support TDXnet / TDIX / DDIX
• Application: 3500 machinery protection rack TMR configurations
• Compatibility: Matches standard 3500 rack backplane and series monitoring cards

Common Applications

The 125744-01 TMR rack interface module is selected for high-reliability TSI (Turbine Supervisory Instrumentation) and machinery protection systems on steam turbines, gas turbines, centrifugal compressors, pumps, fans and large rotating equipment. It is widely used in thermal power plants, combined-cycle power stations, refineries, LNG facilities, offshore platforms and process plants where continuous, trustworthy vibration and machine health monitoring is mandatory. This spare module is a common replacement part for existing 3500 installations needing spare RIM or TMR system upgrades.

Our Supply Information

We supply original Bently Nevada 3500/20 125744-01 TMR Rack Interface Module. All units are inspected before shipment, with full functional testing available upon request. We can also provide other matching 3500 series spare parts including monitor modules, power supplies, keyphasor modules, relay output cards and backplane assemblies. Fast international shipping via DHL, FedEx and UPS is available, and we support commercial invoice, packing list and standard export documents for industrial automation spare parts orders.

If you need the official datasheet, compatibility confirmation, lead time, unit price or bulk quotation for Bently Nevada 125744-01, please send your inquiry to our sales team. We also help customers cross-check part revisions and verify compatibility with your existing 3500 rack firmware and configuration.

3500/20 125744-01

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BENTLY BRAND

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