Introduction
The assembly 3500/45-01-00 176449-04 is a Temperature Monitor and its associated RTD/Thermocouple Input Card for the Bently Nevada 3500 Machinery Protection System. The 3500/45 is a dedicated monitor designed to oversee the temperature of critical machine components, such as bearings. Paired with the 176449-04 input card, it is specifically configured to accept signals from RTDs (Resistance Temperature Detectors) or Thermocouples. This system provides continuous temperature monitoring, alerting operators to overheating conditions that could lead to equipment failure, and can initiate alarms or shutdowns to protect the machinery.
Parameters / Specifications
The following table outlines the key technical parameters for this temperature monitoring assembly.
| Parameter | Specification |
|---|---|
| Assembly Designation | 3500/45-01-00 (Monitor) & 176449-04 (Input Card) |
| Description | Temperature Monitor with RTD/Thermocouple Input Card |
| Monitor: 3500/45-01-00 | |
| Physical Dimensions (H x W x D) | Approx. 190 mm x 40 mm x 120 mm (Standard 3500 Series frame slot) |
| Weight (Monitor) | Approx. 0.5 kg (1.1 lb) |
| Primary Function | Dedicated Monitor for Temperature Points |
| Input Channels | Configurable based on the installed input cards (e.g., 4, 8, or 16 channels) |
| Power Supply | Powered by the 3500 rack. |
| Operating Temperature | 0°C to +65°C (32°F to 149°F) |
| Input Card: 176449-04 | |
| Description | RTD / Thermocouple Input Card |
| Compatible Inputs | RTDs (e.g., 100 Ohm Platinum) or Thermocouples (Type J, K, etc.) |
| Measurement | Temperature |
| Standard Range | Configurable, e.g., 0-200°C or 0-500°C, based on sensor type |
| Accuracy | High accuracy, specific to the sensor type and configuration (e.g., ±0.5°C for RTDs) |
| Total Assembly Weight | Approx. 0.6 kg (1.32 lb) |
*Note: The specific type of temperature sensor (RTD or Thermocouple), temperature range, number of active channels, and alarm setpoints are defined by the "-01-00" configuration and the system's software setup. The 176449-04 card provides the necessary signal conditioning and linearization for the chosen sensor type.*
Application Scenarios
This temperature monitoring assembly is crucial for protecting machinery from thermal damage across various industries.
Bearing Temperature Monitoring:
The primary application is monitoring the temperature of journal and thrust bearings on critical equipment like turbines, compressors, large pumps, and motors. An rising temperature is a key indicator of lubrication failure, bearing wear, or overload.
Winding Temperature Monitoring:
Used to monitor the stator winding temperatures in large electric motors and generators using embedded RTDs, providing early warning of insulation breakdown or overloading.
Process and Lube Oil Temperature:
Can be configured to monitor the temperature of lube oil, seal oil, or other process fluids, ensuring they are within safe operating limits for the machinery.
API 670 Compliant Machinery Protection:
Serves as the monitoring and alarm unit for temperature channels in a machinery protection system designed to meet API 670 standards, providing reliable and standardized protection.
Plant-Wide Critical Temperature Points:
Deployed in 3500 racks to provide a centralized and highly reliable system for monitoring all critical temperature points on a machine or within a unit, feeding data and alarms directly to the plant's DCS.
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