Description

Bently Nevada 136711-02 | 3500/60 Internal Safety Barrier I/O Module

The Bently Nevada 136711-02 is a specialized Internal Barrier I/O module designed for the 3500/60 and 3500/61 Temperature Monitor series. This component provides intrinsically safe (IS) interfaces for temperature sensors located in hazardous areas. By limiting the electrical energy transferred from the monitor rack to the field sensors, the 136711-02 prevents the ignition of potentially explosive atmospheres. It serves as a bridge between the 3500 monitor and various temperature transducers, ensuring that the system remains compliant with global safety standards while delivering high-accuracy data for machinery protection.

Intrinsic Safety and Signal Integrity

Safety is the core function of the 136711-02 module. It utilizes internal zener barriers and current-limiting resistors to protect the field wiring from electrical faults. Unlike external barriers that require additional cabinet space and complex wiring, this internal solution integrates directly into the 3500 rack. This integration simplifies installation and reduces the number of potential failure points in the signal chain. Furthermore, the module maintains excellent signal-to-noise ratios, which is critical for the low-voltage signals typically generated by Resistance Temperature Detectors (RTDs) and Thermocouples (TCs) in heavy industrial environments.

Technical Specifications

The following parameters define the operational and mechanical profile of the 136711-02 I/O module:

• Manufacturer: Bently Nevada (Baker Hughes)
• Model Number: 136711-02
• Module Type: Internal Barrier I/O Module
• Compatibility: 3500/60 and 3500/61 Temperature Monitors
• Channel Support: 6-channel temperature monitoring
• Transducer Types: Supports RTDs and Thermocouples
• Safety Rating: Intrinsically Safe (IS) for hazardous area Class I, Div 1/Zone 0
• Dimensions: 2.5 cm x 18.5 cm x 24.2 cm
• Net Weight: 0.98 kg
• Terminations: Internal terminal blocks for field wiring

Applications in Critical Asset Monitoring

Proper temperature monitoring is essential for the longevity of turbines, compressors, and large motors. The 136711-02 allows the 3500 system to monitor bearing temperatures and process temperatures directly within explosive zones. By providing real-time data to the 3500/60 monitor, it enables automated machinery protection, such as alarm triggering or emergency shutdowns when thermal limits are exceeded. This proactive approach prevents bearing seizures and rotor damage, significantly extending the service life of expensive industrial assets. The module is particularly valuable in oil and gas refineries and chemical processing plants where hazardous vapors are frequently present.

Installation and System Reliability

Technicians install the 136711-02 into the rear of the 3500 rack, where it connects directly to the monitor via the backplane. The “Internal Termination” design means that field wires land directly on the module, eliminating the need for intermediary terminal strips. Because it is part of the 3300/3500 evolution of Bently Nevada hardware, it is built for long-term durability and resistance to thermal stress. Operators must ensure that the module is properly grounded according to the 3500 Internal Barrier Installation manual to maintain the integrity of the intrinsic safety protection。