Description
Product Overview
The Bently Nevada 3500/65 184469-01 is a rack-based temperature monitoring assembly developed for the 3500 Machinery Protection System. The module combination provides continuous thermal supervision for rotating equipment using RTD and thermocouple sensor inputs.
The external termination I/O assembly 184469-01 is designed for installations requiring simplified field wiring access, improved shielding performance, and flexible RTD/TC termination arrangements. It is commonly implemented in API 670 compliant turbine and compressor monitoring systems where long-term reliability and maintainability are essential.
The monitor supports independent channel configuration, alarm processing, and integration with machinery condition monitoring platforms.
System Functions
The 3500/65 184469-01 performs temperature acquisition, signal conditioning, and protection processing for industrial machinery applications.
Key operational capabilities include:
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Six independent temperature input channels
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RTD and thermocouple sensor compatibility
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Continuous signal conversion for rack processing
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Channel-based Alert and Danger alarms
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Sensor fault diagnostics and integrity monitoring
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Digital filtering and signal stabilization
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Communication with System 1 monitoring software
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Compatibility with recorder output modules for 4–20 mA transmission
Each channel can be configured individually according to the sensor type and operating range.
Supported Temperature Sensors
RTD Sensor Compatibility
| RTD Type |
Wiring Configuration |
| Pt100 Platinum RTD |
2-wire / 3-wire / 4-wire |
| Ni120 Nickel RTD |
Supported |
| Cu10 Copper RTD |
Supported |
Thermocouple Compatibility
| Thermocouple Type |
Typical Usage |
| Type J |
Industrial process equipment |
| Type K |
Turbine and exhaust monitoring |
| Type E |
High-sensitivity applications |
| Type T |
Low-temperature environments |
The 184469-01 I/O assembly incorporates cold junction compensation support for thermocouple stability and measurement accuracy.
Technical Specifications
| Parameter |
Specification |
| Model |
3500/65 184469-01 |
| Product Type |
RTD / Thermocouple Temperature Monitor |
| Manufacturer |
Bently Nevada |
| System Platform |
3500 Machinery Protection System |
| Channel Count |
6 Independent Channels |
| Sensor Types |
RTD and Thermocouple |
| RTD Support |
Pt100, Ni120, Cu10 |
| Thermocouple Support |
J, K, E, T |
| Termination Method |
External Terminal Block |
| I/O Module |
184469-01 |
| Alarm Functions |
Alert and Danger |
| Signal Processing |
High-resolution digital conversion |
| Diagnostics |
Open circuit, short circuit, out-of-range detection |
| Isolation |
Channel-to-channel and channel-to-ground |
| Operating Temperature |
-30°C to +65°C |
| Humidity Rating |
95% non-condensing |
| Mounting |
3500 Rack System |
| Dimensions |
24.1 × 2.6 × 11.2 cm |
| Weight |
0.45 kg |
The external termination design simplifies commissioning and field maintenance in large industrial cabinets.
Features of the 184469-01 External I/O Module
The 184469-01 differs from standard internal termination modules by offering enhanced field accessibility and specialized termination architecture.
Notable design characteristics include:
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External screw-terminal wiring interface
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Improved shielding and grounding structure
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Support for complex OEM sensor wiring layouts
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Easier cable inspection and maintenance access
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Reduced disturbance during service procedures
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Optimized signal routing for electrically noisy environments
This configuration is frequently selected for turbine packages and compressor skids requiring organized external wiring infrastructure.
Industrial Applications
The 3500/65 184469-01 assembly is commonly used in thermal protection systems for critical machinery.
Typical installation environments include:
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Steam and gas turbines
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Centrifugal compressors
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Industrial pumps
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Generator temperature protection systems
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Gearbox thermal monitoring
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Lubrication oil temperature supervision
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Seal oil and auxiliary process systems
The module is particularly suited for installations where external termination accessibility is a maintenance requirement.
FAQ
Q: Does the 3500/65 support both RTD and thermocouple sensors simultaneously?
Yes. Individual channels can be independently configured for RTD or thermocouple operation.
Q: What is the purpose of the 184469-01 module?
The 184469-01 provides an external field termination interface for sensor wiring connected to the 3500/65 monitor.
Q: Is the module suitable for API 670 applications?
Yes. The configuration is commonly used in API 670 compliant machinery protection systems.
Q: What advantages does external termination provide?
External termination improves field wiring accessibility, simplifies maintenance, and reduces downtime during service procedures.
