Allen-Bradley 1794-CJC2 Thermocouple Compensation Kit N7

Allen-Bradley 1794-CJC2 FLEX I/O Cold Junction Compensation Sensor Kit (Set of 2)

Product Overview

The 1794-CJC2 is a high-precision Cold Junction Compensation (CJC) kit manufactured by Rockwell Automation for the Allen-Bradley FLEX I/O product line. Accurate thermocouple temperature measurement requires a stable reference point at the junction where the thermocouple wires interface with the copper terminals of the I/O module. The 1794-CJC2 provides this critical reference by monitoring the ambient temperature at the terminal base, allowing the PLC to mathematically compensate for the "cold junction" voltage. This kit is essential for eliminating measurement errors caused by fluctuating temperatures at the connection point, ensuring the integrity of process data in thermal monitoring applications.

Technical Specifications

The 1794-CJC2 kit includes two thermistor-based sensors designed for direct integration into FLEX I/O terminal bases.

• Manufacturer: Rockwell Automation / Allen-Bradley

• Model Number: 1794-CJC2

• Product Category: FLEX I/O Accessories

• Function: Cold Junction Compensation (CJC)

• Quantity: 2 pieces per kit (N7)

• Temperature Compensation Range: 0°C to +70°C (32°F to 158°F)

• Operating Temperature: 0°C to +55°C (32°F to 131°F)

• Storage Temperature: -40°C to +85°C (-40°F to 185°F)

• Compatibility: 1794-IT8, 1794-IRT8, 1794-IT8I, 1794-IRT8I, and other FLEX I/O thermocouple modules

• Installation Interface: Plugs into dedicated ports on FLEX I/O Terminal Bases (e.g., 1794-TB3, 1794-TB3S)

• Weight: 0.06 lbs (0.03 kg)

• Certifications: CE, UL, CSA compliance

Core Functional Features

• Precision Reference Monitoring: The sensors provide a highly accurate temperature reference directly at the wire-to-terminal interface, which is vital for calculating the absolute temperature from millivolt thermocouple signals.

• Dual-Sensor Kit: Each 1794-CJC2 set contains two compensators, typically used for the top and bottom rows of a terminal base to account for thermal gradients within a control cabinet.

• Seamless Hardware Integration: These sensors are designed to snap into place on the terminal base without special tools, ensuring a low-profile installation that does not interfere with field wiring.

• Industry Standard Reliability: Built to withstand industrial environments, the thermistors provide long-term stability and minimal drift, essential for process control in manufacturing and energy sectors.