Overview
The Bently Nevada 3500/65-02-00, together with I/O Module Part Number 172109-01, is a 16-Channel Temperature Monitor designed for the Bently Nevada 3500 Machinery Protection System. It continuously monitors temperature inputs from Resistance Temperature Detectors (RTDs) and isolated-tip Thermocouples (TCs), compares them against user-configurable alarm setpoints, and provides reliable machinery protection for critical rotating equipment.
The module is widely used to monitor:
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Radial bearing metal temperature
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Thrust bearing temperature
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Compressor suction and discharge temperatures
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Steam temperatures
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Motor stator winding temperatures
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Other critical process temperatures in accordance with API 670.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model | 3500/65-02-00 |
| I/O Module Part Number | 172109-01 |
| Product Type | 16-Channel Temperature Monitor |
| Number of Channels | 16 |
| Inputs | RTD and Isolated Tip Thermocouple |
| Supported RTDs | 3-wire and 4-wire RTD |
| Supported Thermocouples | Isolated-tip TC |
| Configuration Software | 3500 Rack Configuration Software |
| I/O Module Type | 02 – External Terminations |
| Agency Approval | 00 – None |
| Rack Slot | One full-height front slot + one full-height rear slot |
| Typical Power Consumption | Approximately 3 W |
Typical Applications
The 3500/65-02-00 is commonly used on:
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Steam turbines
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Gas turbines
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Centrifugal compressors
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Generators
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Electric motors
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Pumps
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Industrial process equipment
Typical monitoring points include:
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Bearing metal temperatures
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Thrust bearing temperatures
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Motor stator temperatures
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Lube oil temperatures
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Process temperatures
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Compressor inlet/outlet temperatures
Key Features
16 Independent Temperature Channels
Supports monitoring of up to 16 temperature inputs simultaneously for comprehensive machinery protection.
RTD and Thermocouple Compatibility
Compatible with:
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3-wire RTDs
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4-wire RTDs
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Isolated-tip thermocouples
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Mixed RTD/TC installations
allowing flexible field configuration.
Programmable Alarm Functions
Each channel supports independently configurable:
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Alert setpoints
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Danger setpoints
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Alarm delays
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Voting logic (for TMR systems)
using the 3500 Rack Configuration Software.
External Termination Design
The 172109-01 I/O module provides external field wiring, simplifying installation and maintenance in industrial control cabinets.
API 670 Machinery Protection
The monitor is designed for machinery protection applications consistent with API 670, making it suitable for critical rotating equipment in oil & gas, power generation, and process industries.
Triple Modular Redundant (TMR) Support
In TMR configurations, three adjacent 3500/65 monitors can be installed to provide redundant temperature monitoring and voting logic for high-availability systems.
Frequently Asked Questions
1. What does the 3500/65-02-00 monitor measure?
It monitors temperature from RTDs and isolated-tip thermocouples on up to 16 independent channels.
2. What is the function of the 172109-01 module?
The 172109-01 is the external termination I/O module used with the 3500/65-02-00, providing convenient field wiring connections.
3. Can RTDs and thermocouples be mixed?
Yes. The monitor supports any combination of compatible 3-wire RTDs, 4-wire RTDs, and isolated-tip thermocouples.
4. Does this model include hazardous-area approvals?
No. The 00 option indicates no agency approvals. Other approval options are available for specific applications.
5. Is the monitor programmable?
Yes. All channel types, alarm setpoints, and operating parameters are configured using the 3500 Rack Configuration Software.
6. Is it compatible with TMR systems?
Yes. It supports Triple Modular Redundant (TMR) configurations for high-reliability machinery protection.
7. What industries typically use the 3500/65?
It is widely used in:
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Oil & Gas
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Power Generation
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Petrochemical
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Chemical Processing
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Mining
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Marine
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Heavy Industrial Manufacturing
8. Which temperature sensors are recommended?
The monitor supports multiple sensor types, with platinum RTDs (α = 0.00385) commonly recommended for industrial applications, as well as isolated-tip thermocouples.
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