Bently 133819-02 I/O Terminal Board

1. Product Detailed Description

The 133819-02 is the rear I/O module for the 3500/61 Temperature Monitor. It provides 6 channels for connecting temperature sensors. The key feature of this specific part number is its Internal Terminations, which means the field wiring from sensors (RTDs or Thermocouples) is connected directly to the terminal blocks on the module itself, rather than requiring an external terminal strip.

Unlike the 3500/60, the 3500/61 (which this I/O module supports) provides 4 to 20 mA recorder outputs for each of the six channels, allowing for local recording or integration with other control systems like a PLC or DCS.

2. Product Parameters (Specifications)

3. Product Advantages

• Dual Compatibility: It can process signals from both RTDs and Thermocouples simultaneously across different channels.

• Space-Efficient: Internal terminations eliminate the need for extra cabinet space used by external terminal blocks and interconnect cables.

• Real-time Data: Provides dedicated 4–20 mA outputs for each channel, ensuring that temperature data is always available for trending and recording.

• High Precision: Features internal Cold Junction Compensation (CJC) for thermocouples, ensuring accurate readings even with fluctuating ambient temperatures.

• TMR Capability: Supports Triple Modular Redundant (TMR) configurations for high-reliability applications where "voting" logic is required.

4. Cautions & Precautions

• Non-Isolated Version: The 133819-02 is a non-isolated I/O module. If your application requires high channel-to-channel isolation (e.g., 250 Vdc) to protect against electrical noise or ground loops, an isolated version should be used instead.

• Wiring Density: Because it has 6 channels and internal terminations, the wiring at the back of the rack can become crowded. Proper cable management is essential.

• Sensor Matching: Ensure the sensor type (e.g., Type K vs. Type J) is correctly configured in the 3500 Rack Configuration Software to match the physical wiring.

• ESD Protection: Always use an earthed wrist strap when handling the module to prevent Electrostatic Discharge (ESD) damage to the sensitive internal circuitry.

5. Product Applications

This module is typically used to monitor temperature on critical machinery components such as:

• Radial Bearings: Monitoring for overheating in turbines and compressors.

• Thrust Bearings: Detecting axial load issues via temperature rise.

• Stator Windings: Monitoring the internal temperature of large motors and generators.

• Lube Oil Systems: Ensuring oil temperatures remain within safe operating limits. 

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