Bently Nevada 3500/65 172103-01 RTD/TC I/O Module with Internal Terminations

Description

The Bently Nevada 3500/65 172103-01 (PWA 184522-01) is an internal termination rear I/O module designed for the 3500/65 16-Channel Temperature Monitor system. Installed in the rear slot of a standard 3500 machinery protection rack, it provides the physical interface for connecting up to 16 resistance temperature detectors (RTDs) or isolated tip thermocouples (TCs). The module processes incoming transducer signals and routes them directly to the main 3500/65 front monitor for continuous thermal monitoring and setpoint evaluation.

Engineered to support critical industrial machinery protection, the 172103-01 accepts a wide variety of standard sensor types, including 3-wire RTDs, 4-wire RTDs, and Types E, J, K, and T thermocouples. Integrated internal termination headers streamline panel wiring by allowing field sensor leads to attach directly to the module without requiring external termination blocks or intermediate cabling assemblies.

Features

• 16-Channel Capacity: Supports up to 16 independent RTD or isolated tip thermocouple transducer signals on a single rear I/O card.
• Internal Termination Design: Features on-board 20-position terminal headers for direct field wiring, eliminating the need for external termination hardware.
• Broad Sensor Compatibility: Accepts 100 ohm Platinum (alpha = 0.00385 and 0.00392), 120 ohm Nickel, and 10 ohm Copper RTDs, as well as Type E, J, K, and T thermocouples.
• Cold Junction Compensation: Includes built-in cold junction compensation sensors for precise thermocouple temperature measurement accuracy.
• Hot-Swappable Rack Integration: Connects directly into the rear full-height slot of a standard Bently Nevada 3500 rack interface backplane.

Applications

• Thermal monitoring of motor, generator, and turbine bearing temperatures.
• Real-time monitoring of gas turbine exhaust gas temperatures (EGT) and compressor discharge temperatures.
• Gearbox casing, sump, and lube oil temperature monitoring in critical rotating machinery.
• Process temperature integration within 3500 Machinery Protection Systems (MPS).

Ordering Information

Technical Specifications

General

Input Capabilities

Performance & Accuracy

Environmental & Physical

Connections / Interfaces

Installation Guidelines

1. Confirm that the rack power is switched off or follow hot-swap procedures per local plant safety guidelines.
2. Align the 172103-01 I/O module with the rear full-height slot directly behind the corresponding 3500/65 front monitor.
3. Slide the module into the rack guide rails until the backplane connectors fully engage.
4. Tighten the top and bottom securing thumb screws to ensure proper chassis grounding.
5. Wire the RTD or TC sensor leads to the internal 20-position terminal headers following the channel assignment diagram in the manual.
6. Verify signal lead integrity and ensure shield drain wires are properly grounded according to system installation drawings.

Configuration / Commissioning / Replacement

• Firmware Compatibility: When replacing an older revision I/O module with revision 172103-01 Rev F or higher, ensure the front 3500/65 monitor is updated to the latest compatible firmware version.
• Firmware Update Sequence: You must physically remove the I/O module from the rack before upgrading the 3500/65 monitor firmware. Failure to remove the I/O module during the upgrade will result in an "I/O Module Mismatch" and "562 ADC Failure" error in the System Event List.
• Software Configuration: Channel types (RTD vs TC), range limits, and alarm setpoints must be configured using 3500 Rack Configuration Software (Version 3.85 or later).

Compliance and Certifications