Product Description

Overview

The Bently Nevada 136711-02 is a specialized RTD/TC I/O Module with Internal Barriers for the 3500/61 Temperature Monitor system. Designed for hazardous environments, this module provides intrinsic safety by limiting energy to connected sensors, ensuring safe operation in flammable atmospheres.

It interfaces up to six temperature channels, supporting both Resistance Temperature Detectors (RTDs) and Thermocouples (TCs), while integrating directly with the 3500 rack to deliver accurate, reliable temperature monitoring in industrial applications.

General Description

The 136711-02 is a full-height I/O module that connects to the 3500/61 main monitor module. Its defining feature is the inclusion of internal barriers, which protect field sensors and prevent ignition in hazardous areas. This module is ideal for installations in oil and gas, petrochemical, and power generation environments requiring Class I Division 1 or Zone 0/1 certification.

• Primary Function: Interfaces 6 channels of temperature signals with intrinsic safety protection

• Termination: Internal screw terminals for direct wiring

• Safety Feature: Integrated internal barriers eliminate the need for separate zener barriers or galvanic isolators

Key Performance Characteristics

Sensor Compatibility

• Supports 6 channels of temperature inputs (RTDs or TCs)

• Compatible RTDs: 3-wire or 4-wire (Platinum, Copper, Nickel)

• Supported Thermocouples: J, K, T, E, R, S with built-in Cold Junction Compensation (CJC)

Intrinsic Safety Protection

• Internal Barriers: Limits energy to sensors in hazardous areas, ensuring system safety

• Protects rack electronics from field wiring faults and surges

Signal Accuracy & Processing

• Typical accuracy: ±3°C at 25°C, high resolution of 1°C/1°F

• Provides 4–20 mA analog outputs for each of the six channels to DCS or chart recorders

• Frequency response optimized for temperature monitoring, approximately 30 kHz internal bandwidth

Environmental & Physical

• Operating Temperature: 0°C to +65°C (32°F to +150°F)

• Humidity: 95% non-condensing

• Weight: 0.46 kg (1.01 lbs)

• Dimensions: 241.3 mm × 24.4 mm × 163.1 mm

Installation Notes

• Internal barriers require a dedicated I/O module slot in the 3500 rack

• ISEarthing Module (3500/04-01) is mandatory to establish a proper intrinsic safety earth

• Standard and internal barrier I/O modules can coexist in the same rack if minimum 50 mm separation is maintained between safe and hazardous wiring

• Not compatible with Triple Modular Redundant (TMR) racks

Technical Specifications Table

Applications

• Hazardous area temperature monitoring for oil, gas, and petrochemical industries

• Integration with 3500/61 temperature monitoring systems in intrinsically safe configurations

• Data acquisition for DCS or chart recording

FAQ

Q: What is the purpose of the internal barriers?
A: Internal barriers limit energy to connected sensors to prevent ignition in hazardous environments.

Q: Can internal barrier modules coexist with standard I/O modules?
A: Yes, but a minimum 50 mm separation between hazardous and safe wiring must be maintained.

Q: Is an IS Earthing Module required?
A: Yes, the 3500/04-01 module is mandatory to ensure proper intrinsic safety grounding.

Q: Are these modules compatible with TMR racks?
A: No, internal barrier I/O modules cannot be used in Triple Modular Redundant configurations.