Product Introduction
When your industrial process demands precise temperature monitoring across multiple sensors, the Allen-Bradley 1794-IRT8 delivers a cost-effective upgrade path. This Flex I/O combination module replaces older, separate RTD and thermocouple modules, consolidating eight channels into a single unit. It supports both RTD and thermocouple sensors, reducing spare parts inventory and simplifying system design.
Technical Specifications Breakdown
The Allen-Bradley 1794-IRT8 provides 8 channels in 2 groups of 4, with nominal input ranges of -40…100 mV dc for thermocouples and 0…325 mV for RTDs. Its 14-bit resolution ensures accurate temperature readings, while selectable data formats (C, F, K, ohms, mV) offer flexibility. System throughput ranges from 7.4 ms (mV mode) to 10.8 ms (4-wire RTD), enabling fast updates even in high-channel-count applications.
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Resolution: 14 bits
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Accuracy: 0.05% of full range in mV mode with filtering (hardware only: 0.10%)
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Operating Temperature: 0 to 55 C (32 to 131 F)
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Storage Temperature: –40…85 C (–40…185 F)
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Vibration: 5g @ 10 to 500 Hz
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Shock: 30 g operating
Industry Applications
The 1794-IRT8 is ideal for upgrading legacy temperature monitoring systems in chemical processing, food & beverage, and HVAC. For example, in a plastics extrusion line, you can replace three separate analog thermocouple modules with one 1794-IRT8, cutting wiring costs and reducing panel space by 50%. In a pharmaceutical reactor, the module's open-circuit detection and high accuracy (0.05%) ensure batch quality and minimize downtime.
Installation & Setup Guidance
The 1794-IRT8 mounts on a DIN rail and requires a compatible terminal base such as the 1794-TB3G, 1794-TB3GS, or 1794-TB3GK. Use thermocouple wires specified by the sensor manufacturer for signal wiring, or Belden 8761 for millivolt signals. The module ships with two cold junction compensators to boost thermocouple accuracy. For RTDs, support 2-wire, 3-wire, and 4-wire configurations. Note that wire size depends on the terminal base selected.
Compatibility & Integration
The 1794-IRT8 integrates seamlessly into the Allen-Bradley Flex I/O system. It connects to a power adapter and communicates via the backplane with any Flex I/O adapter. This module works with ControlLogix, CompactLogix, and SLC 500 controllers through a suitable adapter. The host system requires 24 VDC nominal supply voltage. Series variations A and B are both supported.
Selection Guide & Purchasing Advice
Before ordering the Allen-Bradley 1794-IRT8, verify your terminal base model and ensure you have the cold junction compensators (included). The module requires a 24 VDC power source and is compatible with 2-, 3-, and 4-wire RTDs as well as Type B, E, J, K, TXK/XK(L), N, R, S, and T thermocouples. For reliable supply, contact UBEST Automation (visit ubest101.myshopify.com) for genuine parts and fast delivery.