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A-B 1797-IRT8 FLEX Ex RTD/Thermocouple Input Module

Product Overview

The Allen-Bradley 1797-IRT8 is an 8-channel FLEX Ex temperature and analog input module designed for intrinsically safe industrial automation applications. It accepts RTD, thermocouple, and millivolt signals for temperature measurement and process monitoring in compatible FLEX Ex I/O systems.

Eu Automation

Key Technical Specifications

Specification	Details
Brand	Allen-Bradley (A-B)
Model	1797-IRT8
Product Series	FLEX Ex
Product Type	RTD / Thermocouple / mV Input Module
Number of Inputs	8 channels
RTD Types	Pt100, Pt200, Ni100, Ni120, Ni200, Cu10
Thermocouple Types	B, E, J, K, N, R, S, T, TXK/XK (L)
Resistance Input Range	0–500 Ω
Millivolt Input Range	-40 to +100 mV
RTD Wiring	2-wire, 3-wire, and 4-wire
Resolution	16-bit
RTD/Thermocouple Accuracy	0.1% of span at 20°C
Power Supply	24 V DC system supply
Operating Temperature	-20 to +70°C
Isolation	Intrinsically safe design; input channels are non-isolated from each other
Lifecycle Status	Discontinued December 31, 2017 US +1

Features & Advantages

Supports eight temperature or millivolt input channels.
Compatible with a variety of RTD and thermocouple sensor types.
Supports 2-wire, 3-wire, and 4-wire RTD connections.
Provides open-sensor, lead-breakage, and overrange detection.
Designed for intrinsically safe applications in hazardous industrial environments.
Offers channel fault indicators for easier troubleshooting.

Typical Applications

Industrial temperature monitoring
Process automation and control
Chemical and petrochemical facilities
Hazardous-area instrumentation
Distributed temperature measurement
FLEX Ex remote I/O systems

Important Notes

This module is an input module, not an output module.
It requires a compatible FLEX Ex system and appropriate field wiring.
Intrinsic safety depends on the complete installation, including wiring, barriers, and hazardous-area certification; verify suitability for the specific zone or division.
The 1797-IRT8 was discontinued by Rockwell Automation in 2017, so check condition and compatibility before ordering.