Introduction
The 3500/61 136711-02 is a specific revision of the Temperature Monitor Module within the Bently Nevada 3500 Machinery Protection System. It is designed to accept signals from multiple Resistance Temperature Detectors (RTDs) or Thermocouples (TCs). The module provides continuous monitoring, conditioning, and alarming for critical temperature points on industrial machinery. It translates sensor signals into precise temperature readings and generates Alert and Danger alarms to warn of abnormal conditions, playing a key role in preventing damage from overheating, insufficient lubrication, or cooling system failures.
Key Parameters
The following table summarizes the key technical and physical specifications for this module.
| Parameter Category | Specification |
|---|---|
| Model / Part Number | 3500/61 (136711-02) |
| Primary Function | Multi-Channel Temperature Monitoring (RTD & Thermocouple inputs). |
| Input Channels | Typically accepts 4, 6, or 8 channels (exact number depends on the specific 136711-02 configuration). |
| Input Sensor Types | Compatible with common RTDs (e.g., 100 Ω Platinum, Pt100) and Thermocouples (e.g., Type J, K, T). |
| Temperature Range | Varies by sensor type. Example RTD range: -50°C to +250°C+. Thermocouple ranges are significantly wider (e.g., up to 1200°C). |
| Accuracy | High accuracy, typically ±0.5°C or better for RTDs after calibration, depending on sensor and configuration. |
| Alarm Outputs | Independent, programmable Alert and Danger setpoints per channel. |
| Power Supply | Powered from the 3500 rack backplane (+24 VDC). Provides sensor excitation for RTDs. |
| Operating Temperature | -30°C to +65°C (ambient, module operating range). |
| Dimensions (H x W x D) | Standard 3500 Series Module Size: 190 mm (H) x 50 mm (W) x 170 mm (D) (Occupies one slot in a 3500 rack). |
| Weight | Approx. 0.6 kg - 0.8 kg (module only). |
| Mounting | Installed in a designated slot of a 3500 rack or frame. |
*Note: The specific channel count, sensor type compatibility, and default scaling are defined by the part number revision (-02). For wiring details, sensor specifications, and exact configuration limits, always consult the official *Bently Nevada 3500/61 Temperature Monitor Module* documentation.*
Application Scenarios
This module is essential for monitoring thermal health across a wide range of critical industrial assets.
Bearing Temperature Monitoring:
Primary Application: Monitors RTDs embedded in journal and thrust bearing pads for large turbines, compressors, motors, and pumps. Rising temperature is a direct indicator of lubrication failure, load issues, or bearing wear.
Winding & Stator Temperature:
Protects large generators and high-voltage motors by monitoring RTDs embedded in stator windings to prevent insulation breakdown and catastrophic failure due to overheating.
Lube Oil System Temperature:
Monitors the inlet and outlet temperature of lube oil coolers and reservoir temperatures to ensure the lubrication system is functioning correctly and maintaining proper oil viscosity.
Process Gas/Seal Gas Temperatures:
In compressors, monitors critical temperatures of process gas streams and seal gas to detect abnormal conditions that could indicate internal damage or inefficient operation.
Casing and Cooling System Temperatures:
Monitors general machinery casing temperatures and cooling water/air outlet temperatures to ensure effective heat dissipation and overall thermal management of the machine.
Industry-Wide Application:
Power Generation: Essential for steam turbine bearings, generator windings, and auxiliary systems.
Oil & Gas: Critical for gas turbine bearings, compressor train bearings, and pump stages.
Pulp & Paper, Chemical, Metals: Used on large dryer rolls, reactor agitators, and rolling mill drives.
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