Why Choose the 1794-IRT8 for Your System?
The 1794-IRT8 module solves critical sensor integration challenges for process engineers. It supports eight analog inputs in two isolated groups of four channels. You can connect both RTD and thermocouple sensors to one compact unit. This flexibility reduces cabinet space and lowers your overall hardware costs.
This module accepts a wide variety of RTD types including platinum, nickel, and copper. You can use 2-wire, 3-wire, or 4-wire configurations for precise temperature measurement. For thermocouples, the module supports types B, E, J, K, N, R, S, and T. This broad sensor compatibility streamlines your procurement process. You no longer need separate modules for different sensor technologies.
Select your preferred data format easily from several robust options. The module outputs in °C, °F, or °K with an implied decimal point. It also offers raw integer formats like -32767 to +32767. For resistance measurements, use the 0 to 5000 ohms mode. For millivolt signals, choose the -4000 to +10000 range. This versatility allows seamless integration with various control systems.
The 1794-IRT8 ships with two cold junction compensators included in the package. These components are critical for accurate thermocouple readings. They increase overall measurement precision in your application. Install the module on a standard DIN rail for quick and secure mounting. Use terminal bases like the 1794-TB3G or 1794-TB3GS for your wiring connections.
Expert Technical Evaluation: Signal Accuracy & Diagnostics
The 1794-IRT8 provides a solid 14-bit resolution for reliable data conversion. In millivolt mode with filtering, it achieves an accuracy of 0.05% of full range. Without filtering, hardware accuracy remains at 0.10% of full range. This performance ensures trustworthy temperature data for critical process control loops.
Diagnostic functions are embedded directly into the module's firmware. It features open circuit detection for both RTD and thermocouple modes. When an open input occurs, the module reading upscales to a default maximum value. The open input detection time is incredibly fast at just two scans. This rapid fault detection helps protect your downstream equipment from erroneous signals.
The module handles an overvoltage capability of 15V DC continuous at 25 °C. This robust protection guards against accidental wiring faults. For signal wiring, use thermocouple extension wire as specified by the sensor manufacturer. For millivolt signals, Belden 8761 is the recommended cable choice. Proper wiring ensures signal integrity and minimizes noise interference.
System throughput times are optimized for fast data updates. Millivolt mode delivers a throughput of just 7.4 ms. For 3-wire RTD mode, the throughput is 10.0 ms. Thermocouple mode in °C or °K processes data in 8.8 ms. These fast cycle times allow for responsive control in dynamic processes. You get reliable temperature data without slowing down your system.
Logistics & Standard Packaging Details
