Bently Nevada 133819-02 RTD/TC I/O Module

Bently Nevada 133819-02 RTD/TC I/O Module

The Bently Nevada 133819-02, also cataloged as the 3500/61 Non-Isolated RTD/TC I/O Module, operates as a dedicated hardware component for multi-channel temperature acquisition within the 3500 Machinery Monitoring System. This module conditions inputs from Resistance Temperature Detectors (RTD) and Thermocouples (TC), providing real-time temperature data and recorder outputs to facilitate continuous machinery protection and diagnostic monitoring.

Hardware Specifications

Machinery Protection and TMR Configuration

The 133819-02 module is engineered to support precise thermal monitoring, essential for detecting overheating in bearing assemblies and auxiliary machinery. When deployed in a Triple Modular Redundant (TMR) configuration, the module must be installed in adjacent groups of three, utilizing dual-voting logic to eliminate single-point failure risks. By providing dedicated recorder outputs, the module ensures that thermal trend data is available for off-line analysis without interfering with the primary protection logic, maintaining strict adherence to the safety performance requirements of the 3500 system.

Frequently Asked Questions

Q: Does the 3500/61 non-isolated module provide channel-to-channel isolation?

A: No, the 133819-02 is a non-isolated version. For applications requiring 250 VDC channel-to-channel isolation to prevent ground loop interference, the isolated TC I/O version must be utilized.

Q: Can this module accept a combination of RTD and Thermocouple inputs?

A: Yes, the 3500 Rack Configuration Software allows the user to configure each of the six channels independently to accept either RTD, thermocouple, or a mixture of both input types.

Field Installation Guidelines

1. Module Slot Placement: Ensure the module is installed in the designated monitor slot within the 3500 rack. When implementing TMR, ensure the three redundant modules are placed in adjacent slots as required by the rack configuration.

2. Wiring and Shielding: Terminate RTD and TC sensor leads at the I/O terminal block. Use shielded instrumentation cable to minimize electromagnetic interference, and ensure the cable shield is grounded at the rack entry point.

3. Cold Junction Compensation: For thermocouple inputs, ensure the I/O terminal block is correctly seated to facilitate accurate cold junction compensation (CJC). Avoid exposing the terminal block to direct air currents or heat sources that could introduce temperature measurement offsets.

4. Configuration Verification: After installation, verify the channel-specific input settings via the 3500 Rack Configuration Software. Confirm that alarm setpoints are correctly programmed and that the recorder output functionality is active for the required monitoring loops.