Description
Product Overview
The Bently Nevada 3500/65 Temperature Monitor is a rack-based monitoring module designed for continuous temperature supervision within the 3500 Machinery Protection System. The unit provides six independently configurable input channels for RTD and thermocouple sensors used in rotating equipment protection applications.
The module is engineered for machinery environments where temperature stability directly affects operational reliability and equipment life. It converts analog temperature signals into digital process values for alarm handling, machine protection logic, event recording, and condition trending.
Typical monitoring targets include bearing metal temperatures, lubrication systems, generator windings, compressor casings, and auxiliary process temperatures associated with critical industrial machinery.
Functional Capabilities
The 3500/65 continuously scans temperature inputs and processes the data through configurable filtering and alarm logic.
Main operating functions include:
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Six independent temperature monitoring channels
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RTD and thermocouple input compatibility
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Continuous sensor health supervision
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Alert and Danger alarm processing
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Digital signal conversion for rack communication
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Open-circuit and short-circuit detection
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Integration with System 1 diagnostic platforms
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Compatibility with recorder output modules for external trending
Each channel can be individually configured with different sensor types, engineering ranges, and alarm thresholds.
Supported Sensor Inputs
The module supports multiple industrial temperature sensor technologies commonly used in machinery protection systems.
RTD Sensor Support
| RTD Type |
Configuration |
| Pt100 Platinum RTD |
2-wire, 3-wire, 4-wire |
| Ni120 Nickel RTD |
2-wire, 3-wire |
| Cu10 Copper RTD |
2-wire, 3-wire |
Supported RTD measurement ranges typically extend from -200°C to +850°C depending on sensor construction and calibration.
Thermocouple Support
| Thermocouple Type |
Typical Application |
| Type J |
General Industrial Heating |
| Type K |
Turbines and Process Equipment |
| Type E |
Low-Level Signal Applications |
| Type T |
Low Temperature Measurements |
Automatic cold-junction compensation is internally applied for thermocouple accuracy stabilization.
Technical Specifications
| Parameter |
Specification |
| Model |
3500/65 |
| Product Type |
Temperature Monitor |
| Series |
3500 Machinery Protection System |
| Monitoring Channels |
6 Independent Inputs |
| Supported Sensors |
RTD and Thermocouple |
| RTD Wiring |
2-wire, 3-wire, 4-wire |
| Alarm Functions |
Alert and Danger |
| Signal Isolation |
Channel-to-Channel and Channel-to-Ground |
| Diagnostic Functions |
Sensor OK and Fault Detection |
| Input Processing |
High-Resolution A/D Conversion |
| Signal Filtering |
Digital Filtering |
| RTD Accuracy |
Typically ±0.1% to ±0.2% |
| Thermocouple Accuracy |
Typically ±1°C to ±2°C |
| Operating Temperature |
-30°C to +65°C |
| Storage Temperature |
-40°C to +85°C |
| Relative Humidity |
95% Non-Condensing |
| Rack Compatibility |
3500 Rack System |
| Module Dimensions |
24.1 × 2.6 × 11.2 cm |
| Weight |
0.45 kg |
The module includes continuous diagnostics for sensor failure, out-of-range conditions, and abnormal wiring states.
Alarm and Protection Features
The 3500/65 is designed for machinery shutdown and thermal protection applications where temperature excursions can lead to equipment damage.
Alarm functions include:
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Independent Alert and Danger thresholds per channel
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Relay activation through 3500/32M and 3500/33 modules
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Adjustable setpoint configuration
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Sensor failure alarming
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High-temperature shutdown integration
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Continuous channel diagnostics
The module supports API 670-based protection strategies for turbines, compressors, motors, and generators.
Typical Industrial Applications
The monitor is widely used in industrial facilities requiring continuous thermal supervision of rotating equipment and auxiliary systems.
Common applications include:
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Journal bearing metal temperature monitoring
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Turbine lube oil temperature measurement
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Generator stator winding supervision
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Compressor casing temperature monitoring
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Seal oil system temperature protection
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Gearbox thermal condition monitoring
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Pump bearing temperature protection
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Industrial process temperature monitoring
Its ability to combine multiple sensor types within a single rack slot simplifies machinery protection system architecture.
FAQ
Q: Can the 3500/65 support both RTD and thermocouple inputs simultaneously?
Yes. Each channel can be independently configured for different sensor technologies.
Q: Does the module provide sensor fault diagnostics?
The monitor continuously checks for open circuits, short circuits, and abnormal signal conditions.
Q: What machinery types commonly use the 3500/65?
The module is widely installed on turbines, compressors, generators, motors, pumps, and gearbox systems.
Q: Is the module compatible with System 1 software?
Yes. The 3500/65 integrates with System 1 platforms for diagnostics, historical trending, and machinery condition analysis.
