Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Part Number | 79492-01 |
| Product Type | Main Board (Processor PCB) |
| Product Family | 3300 Series |
| Associated Monitor | 3300/35 Six-Channel Temperature Monitor |
| Function | Temperature signal processing and alarm control |
| Number of Channels | Up to 6 temperature inputs (host monitor dependent) |
| Installation | Internal PCB for 3300/35 monitor |
| Application | Continuous machinery temperature monitoring |
| Lifecycle Status | Legacy / Obsolete – Spare Part Support |
The 79492-01 is not a standalone monitoring system; it is an internal circuit board installed within the 3300/35 Six-Channel Temperature Monitor assembly.
Product Introduction
The Bently Nevada 79492-01 Main Board is a core electronic assembly for the 3300/35 Six-Channel Temperature Monitor. It receives temperature data from connected sensors (such as RTDs or thermocouples, depending on monitor configuration), processes the measurements, executes alarm logic, and supports communication with the 3300 monitoring rack.
The 3300 Series was widely deployed for machinery protection and condition monitoring in:
- Steam turbines
- Gas turbines
- Compressors
- Pumps
- Large motors
- Generators
- Petrochemical plants
- Power generation facilities
Although the 3300 Series has largely been superseded by the 3500 Series, many installations remain in operation, making spare parts such as the 79492-01 important for maintenance and lifecycle support.
- 79492-01
- 79492-01
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance | Recommended Action |
|---|---|---|---|
| Temperature channel failure | Sensor or input circuit fault | ✅ High | Verify RTD/thermocouple wiring before replacing the board |
| All channels unavailable | Main board failure or power issue | ✅ High | Check rack power supply and board LEDs |
| False high-temperature alarm | Sensor calibration or analog circuit issue | ⚠️ Medium | Compare readings with a calibrated temperature source |
| No alarm output | Alarm relay or processor fault | ⚠️ Medium | Verify relay operation and alarm settings |
| Intermittent measurements | Loose connectors or aging components | ⚠️ Medium | Inspect PCB connectors and backplane contacts |
| Module does not initialize | Backplane communication fault | ✅ High | Clean connectors and verify rack compatibility |
| Replacement board not functioning | Revision mismatch or monitor configuration issue | ✅ High | Confirm board revision and monitor model compatibility |
Technical Note:
In legacy 3300 systems, most reported temperature monitor faults are caused by:
- Faulty RTDs or thermocouples
- Damaged field wiring
- Connector oxidation
- Rack power supply instability
The 79492-01 Main Board should only be replaced after these external causes have been eliminated.
Frequently Asked Questions (FAQ)
Q1. What is the Bently Nevada 79492-01?
The 79492-01 is the Main Board used in the 3300/35 Six-Channel Temperature Monitor, providing signal processing and alarm management for machinery temperature monitoring.
Q2. Is this a complete monitor?
No. It is an internal printed circuit board (PCB) that installs inside a 3300/35 monitor. It cannot operate independently.
Q3. Which systems use this board?
The board is designed for the Bently Nevada 3300/35 Six-Channel Temperature Monitor, part of the legacy 3300 Series Machinery Monitoring System.
Q4. Can this board be replaced in the field?
Yes, provided that:
- Power to the rack is removed.
- Electrostatic discharge (ESD) precautions are followed.
- The replacement board matches the original hardware revision.
- The monitor is tested and calibrated after installation.
Q5. Is the 3300 Series still supported?
The 3300 Series is considered a legacy product family. While many systems remain in service, users often rely on spare parts inventories or professionally refurbished components to maintain existing installations. For long-term modernization, migration to the 3500 Series is commonly considered.
Q6. What should I verify before ordering?
Before purchasing a 79492-01, confirm:
- Exact part number (79492-01)
- Host monitor model (3300/35)
- Hardware revision (if applicable)
- Rack configuration
- Temperature sensor type (RTD or thermocouple)
- Existing fault codes and diagnostic results
Verifying compatibility with the host monitor and confirming that the fault is not caused by field sensors or rack power issues can significantly reduce maintenance time and avoid unnecessary board replacement.
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