The General Electric HE693THM889 is a high-performance 8-channel thermocouple input module designed for integration with the Series 90-30 Programmable Logic Controller (PLC) systems. This module provides precise temperature monitoring capabilities, supporting a wide range of thermocouple types to suit diverse industrial process control requirements.
Features
8-channel thermocouple input capacity.
Supports multiple thermocouple types: J, K, N, T, E, R, and S.
High input impedance (>20 Mohms) to minimize signal loading.
Fast A/D conversion time of 5 milliseconds.
Galvanic isolation between field-side signals and the PLC backplane to mitigate ground loops.
0.5 degC resolution for accurate process feedback.
Applications
Multi-point temperature monitoring in chemical and pharmaceutical reaction vessels.
Food processing oven control, pasteurization, and osmotic probe monitoring.
Real-time temperature feedback for industrial furnaces, quenching tanks, and heat treatment lines.
Heating section control for injection molding machines and extruders.
Technical Specifications
Product Model
HE693THM889
Manufacturer
General Electric
Number of Channels
8
Supported Types
J, K, N, T, E, R, S
Temperature Range
-270 to +1768 degC
Resolution
0.5 degC
Accuracy
+/- 0.5 degC (Typical Type J)
Power Consumption
70mA @ 5VDC; 60mA @ 24V Relay
Operating Temperature
0 to 60 degC
Relative Humidity
5% to 95% (non-condensing)
Installation Guidelines
Ensure the PLC system is powered down before inserting or removing the module from the rack.
Use shielded thermocouple extension wire to minimize electromagnetic interference (EMI) in industrial environments.
Maintain proper grounding practices for the thermocouple sensors to prevent ground loops, utilizing the module's galvanic isolation features.
Ensure adequate ventilation within the enclosure to maintain ambient temperatures within the 0 to 60 degC operating range.
Handle the module using ESD-safe practices to prevent damage to sensitive internal circuitry.
FAQ
What is the HE693THM889?
The HE693THM889 is a thermocouple input module designed for the GE Series 90-30 PLC platform, used to convert analog temperature signals into digital data for process control.
Does this module require external power?
The module consumes 70mA from the 5VDC backplane and 60mA from a 24V relay supply. Ensure the power supply budget of your Series 90-30 rack can accommodate these requirements.
What is the benefit of high input impedance?
The high input impedance (>20 Mohms) ensures that the module does not load the thermocouple signal, which is critical for maintaining measurement accuracy, especially when using long lead wires.
