GE HE693THM884M High-Resolution Thermocouple Input Module

Technical Specifications

• Number of Channels: 8 isolated thermocouple input channels

• Supported Thermocouple Types: J, K, T, E, R, S, B, and others; also configurable for RTDs

• Resolution: 16-bit high resolution, providing temperature readings to 0.1°C

• Accuracy: ±0.1% of full scale

• Conversion Time: Less than 2 milliseconds

• Scan Rate: 40 channels per second

• Operating Temperature Range: -40°C to 70°C

• Common Mode Rejection Ratio: Greater than 60 dB

• Noise Immunity: Greater than 10 V RMS

• Power Supply Voltage: 24 VDC

• Physical Dimensions: 90 mm x 30 mm x 25 mm

• Weight: Approximately 100 g

• Housing Material: Aluminum alloy

• Connection Method: Terminal connection

Key Functional Features

• Built-in Cold Junction Compensation: Automatically corrects for temperature variations at the thermocouple connection point, eliminating cold-end temperature drift and ensuring consistent measurement accuracy .

• Linearization Processing: Converts the non-linear millivolt signals inherent to thermocouples into a linear digital temperature value for straightforward processing by the PLC .

• Configurable Reporting Units: Reports values to the PLC I/O table in user-selectable increments of 0.5°C, 0.5°F, 0.1°C, or 0.1°F, providing flexibility for different application needs .

• Advanced Diagnostic Alarms: Each of the eight channels is equipped with two dedicated alarm bits: an open circuit alarm to detect sensor failure and a setpoint alarm for process deviations. Alarm setpoints are configured per channel through %AQ registers .

• Direct Sensor Connectivity: Allows thermocouple temperature sensors to be connected directly to the PLC without any external transmitters or signal conditioners, simplifying system architecture and reducing component count .

Application Scenarios

• Process Control in Chemical and Petrochemical Industries: Deployed for precise temperature monitoring and control of chemical reactors, distillation columns, and pipeline processes where exact thermal management is critical for product quality and safety .

• Metals and Materials Processing: Used in steel mills and foundries to monitor the temperature of furnaces, kilns, and molten metal processes, where the module’s high resolution and rugged design are essential for withstanding harsh electrical noise .

• Power Generation and Energy: Integrated into power plants for monitoring boiler temperatures, turbine bearing temperatures, and cooling systems, ensuring efficient and safe operation of generation equipment .

• Water and Wastewater Treatment: Applied in water treatment facilities for monitoring equipment temperature and environmental conditions, contributing to the reliable operation of treatment processes .