Bently Nevada 133819-02 3500/61 RTD/TC Non-Isolated I/O Module

Product Overview

The Bently Nevada 133819-02 is a specialized RTD/TC Non-Isolated I/O Module designed for the 3500/61 Temperature Monitor. This module provides the physical interface for six channels of temperature monitoring, supporting both Resistance Temperature Detectors (RTD) and Thermocouples (TC). The 133819-02 features Internal Terminations, allowing field wiring to connect directly to the terminal blocks on the I/O module itself. This non-isolated version offers maximum flexibility, permitting users to configure the module for TC, RTD, or a mixture of both sensor types across its six channels.

Functional Intelligence & Recorder Outputs

As a 3500/61 series component, this I/O module includes dedicated recorder outputs for each of its six channels. It provides a +4 to +20 mA signal proportional to the monitor's full-scale range, enabling seamless integration with external control systems, DCS, or chart recorders for data logging. The module's architecture is fault-tolerant; monitor operation remains unaffected by short circuits on the recorder outputs, ensuring that the primary machinery protection functions remain active.

Technical Specifications

Technical FAQs

What is the main difference between the 3500/60 and 3500/61 modules?Both modules provide identical six-channel temperature monitoring functionality. However, the 3500/61 (which uses the 133819-02 I/O) includes 4-20 mA recorder outputs for each channel, whereas the 3500/60 does not provide these analog outputs.

Can I mix different sensor types on a single 133819-02 module?Yes. Unlike the isolated versions, this non-isolated I/O module can be configured via the 3500 Rack Configuration Software to accept any combination of TC and RTD inputs across its six channels.

How does the module handle RTD wiring?The module provides a specialized current source of 925 $\mu$A. It is designed to support 3-wire RTDs (using two current supplies for lead-wire compensation) and 4-wire RTDs (using a single supply), ensuring accurate temperature measurement across various transducer types.

Field Engineering & Installation Guide

• Internal Termination Management: The 133819-02 utilizes internal terminal blocks. Ensure that field wiring is properly labeled and securely fastened to prevent intermittent signals, which could trigger "Bypass" or "Error" status LEDs on the front panel of the monitor.

• Environmental Considerations: The module is rated for an operating temperature range of -30 °C to +65 °C. For installations in extreme environments, ensure the 3500 rack has adequate ventilation to maintain these limits and prevent accuracy drift.

• TMR Configuration: When used in Triple Modular Redundant (TMR) applications, three temperature monitors must be installed in adjacent groups. The system employs two types of voting to prevent single-point failures from causing false trips in critical machinery.

Engineering Advantages

The Bently Nevada 133819-02 provides a cost-effective, high-density solution for machinery temperature protection. By combining TC and RTD support into a single module with internal terminations, it reduces cabinet space and simplifies wiring complexity. For B2B procurement, choosing the original 133819-02 ensures full compatibility with the 3500 Monitoring System, maintaining the high accuracy and ruggedness required for protecting turbines, compressors, and large industrial motors.