3500/65 145988-02 Bently temperature monitoring module

Bently Nevada 3500/65 (145988-02) Product Overview & Technical Specifications
Product Brief
The Bently Nevada 3500/65 (model 145988-02) is a 16-channel temperature monitoring module designed for critical machinery protection, supporting both RTD and isolated-tip thermocouple inputs with programmable alarms and seamless integration into the 3500 monitoring system for reliable industrial and power-generation applications.
Brand Bently Nevada (Baker Hughes)
Model 3500/65, part number 145988-02
Dimensions
The module conforms to the 3500 rack form factor, with physical dimensions of 241.3 mm (height) × 24.4 mm (width) × 241.8 mm (depth) and a weight of approximately 0.91 kg (2.0 lbs.) for the main unit; the I/O module measures 241.3 mm × 24.4 mm × 99.1 mm and weighs 0.45 kg (1.0 lb.). It occupies one full-height front slot in the 3500 rack.

3500/65

Key Features
16-Channel Temperature Monitoring: Simultaneously monitors up to 16 temperature points, supporting mixed RTD and thermocouple inputs for flexible deployment.
Wide Input Compatibility: Accepts 100 Ω 3-wire/4-wire platinum RTDs and isolated-tip thermocouples (Types E, J, K, T), with cold-junction compensation for accurate TC measurements.
High Precision: Delivers 1°C/1°F resolution and ±3°C accuracy at 25°C (±5.4°F at 77°F), ensuring reliable process and machinery temperature tracking.
Programmable Alarms: Features user-configurable alert and danger setpoints with relay outputs, supporting alarm delays and voting logic in TMR configurations to prevent false trips.
Robust Communication: Equipped with RS-232 and RS-485 ports for configuration, data logging, and integration with supervisory systems, compatible with 3500 Rack Configuration Software.
Industrial Reliability: Operates from -20°C to +65°C, with EMC compliance and hazardous-area approvals for use in demanding industrial environments.
Redundancy Support: Designed for Triple Modular Redundant (TMR) setups, using voting logic to eliminate single-point failures in critical applications.

3500/65

Input & Output
Input Specifications
Temperature Inputs: 16 isolated channels supporting 100 Ω platinum RTDs (3-wire/4-wire) and isolated-tip thermocouples (Types E, J, K, T), with input ranges matching sensor specifications (e.g., Type K: 0°C to +1370°C).
Power Input: 24 V DC nominal supply, compatible with standard industrial power systems.
Communication Inputs: RS-232 and RS-485 ports for receiving configuration commands and data requests from host systems or software tools.
Rack Bus Input: Interfaces with the 3500 rack backplane for power, synchronization, and data sharing with other modules in the system.
Output Specifications
Alarm Relay Outputs: Isolated relay contacts for alert and danger conditions, with user-programmable setpoints and fail-safe operation to indicate abnormal temperatures.
Communication Outputs: RS-232 and RS-485 ports for transmitting real-time temperature data, alarm status, and diagnostic information to SCADA, PLCs, or monitoring software.
Status Indicators: LED outputs for power, channel activity, and alarm conditions, enabling quick visual diagnostics without additional tools.
Rack Bus Output: Communicates processed temperature data and alarm signals to the 3500 rack’s controller or other modules for coordinated machinery protection.