Yokogawa CT5-TJ*A Thermocouple Input Module

The Yokogawa CT5-TJ*A, also cataloged as the CT5-TJ*A Thermocouple Input Module, operates as a dedicated hardware component for converting millivolt thermocouple signals into digitized temperature values within Yokogawa CENTUM control systems. Suffix Breakdown & Model Matrix CT5-TJ*A TJ: Thermocouple sensor input class support (Type J, K, T thermocouple types) *A: Base module revision and terminal block execution variant Hardware Specifications Parameter Specification Model CT5-TJ*A Brand Yokogawa Origin Unspecified Weight 200 g to 300 g Dimensions Standard CENTUM rack form factor Operating Temp -10 deg C to +55 deg C Storage Temp -25 deg C to +75 deg C Power Consumption Standard internal bus draw Measurement Range 0 deg C to 180 deg C Signal Input Type Millivolt thermocouple inputs Cold Junction Compensation Integrated electronic CJC circuit Humidity Range 5% to 95% RH non-condensing Certifications CE, UL, RoHS compliant Cold Junction Compensation and Channel Isolation The module incorporates an onboard temperature sensor for real-time cold junction compensation (CJC), dynamically adjusting terminal reference junctions to eliminate measurement drift caused by ambient temperature shifts. Differential input stages provide channel isolation, minimizing common-mode voltage interference and electromagnetic noise pickup from industrial thermocouple wiring loops. Frequently Asked Questions Q: What thermocouple sensor types are supported by the CT5-TJ*A input circuitry? A: The input channels accept millivolt signals from Type J, Type K, and Type T thermocouples, along with other standard thermoelectric pairings. Q: How does the module handle ambient temperature variations at the terminal connection points? A: The integrated cold junction compensation network tracks terminal block temperatures continuously, applying real-time software corrections to maintain conversion accuracy. Field Installation Guidelines Mount the module securely onto the designated Yokogawa CENTUM base unit or rack slot, ensuring the physical guide pins engage correctly. Terminate thermocouple extension wires directly to the corresponding terminal blocks, maintaining correct polarity to prevent thermoelectric offset errors. Ensure cabinet environmental controls maintain ambient operating conditions within the -10 deg C to +55 deg C range with humidity levels between 5% and 95% RH.