Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1769‑CJC / 1769‑CJC/A |
| Manufacturer | Rockwell Automation (Allen‑Bradley) |
| Product Type | Cold Junction Compensation Sensor |
| Sensing Element | Dual high‑precision thermistors |
| Measurement Range | 0 °C to 60 °C (32 °F to 140 °F) |
| Measurement Accuracy | Typically ±0.5 °C (±1 °C max) |
| Compensation Channels | Supports up to 2 independent zones |
| Power Supply | Powered via backplane or connected module |
| Connection | Dedicated cable to thermocouple module |
| Mounting | DIN rail (TS35 × 7.5 or 15 mm) |
| Operating Environment | 5% to 95% RH non‑condensing |
Main Features and Advantages
Precision Compensation for Thermocouple Accuracy: Thermocouples measure the temperature differencebetween the process (hot) end and the terminal block (cold end). If the cabinet temperature changes, the reading drifts. The 1769‑CJC eliminates this error by providing a precise (±0.5°C) reference of the terminal block temperature, which the analog input module uses to correct the final reading. This is essential for processes where a few degrees of error can impact product quality.Plug-and-Play Integration with Compact I/O: Designed as a companion to specific thermocouple modules, the 1769‑CJC connects via a short, dedicated cable (often included with the analog module). It draws power directly from the system, requires no complex configuration in RSLogix 5000 or Studio 5000, and is automatically recognized by the system. This simplifies wiring and commissioning compared to external universal CJC sensors.Dual-Channel Design for Multi-Zone Control: A single 1769‑CJC module contains two independent thermistor circuits. This allows one module to provide compensation for two separate thermocouple modules or two distinct temperature zones within a single chassis, reducing hardware costs and saving DIN rail space in compact panels.
Application Field
The 1769‑CJC is used wherever high‑accuracy thermocouple measurement is required in a CompactLogix or Compact I/O environment. In plastics and rubber machinery, it ensures precise barrel and mold temperature control during injection molding and extrusion. For heat treatment furnaces and industrial ovens, it compensates for the high ambient temperatures near the control cabinet, preventing undercooking or overcooking of metal parts.In food & beverage and pharmaceutical batch processing, it maintains accurate temperature monitoring in reactors and fermenters to comply with strict process validation requirements. It is also critical in energy and power applications, such as turbine exhaust monitoring and boiler control, where reliable temperature data is necessary for efficiency and safety.
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