Specifications

Publication 1794-SG002D-EN-P - May 2012
44 Select FLEX I/O Modules
1794-IR8 Derating Curve
The area within the curve represents the safe operating range for the module
under various conditions of user supplied 24V DC supply voltages and ambient
temperatures.
= Safe operating area
1794-IRT8 and 1794-IRT8XT Thermocouple/RTD Input Module
The 1794-IRT8 is a high-speed, high-accuracy temperature/mV measuring
module that accepts thermocouple inputs, 2-, 3-, and 4-wire RTD inputs, and mV
source inputs.
The 1794-IRT8 offers the following:
• wire-off, over-range, and under-range detection
• good common mode rejection
• usage with long thermocouple wiring
• effective in noisy environments
• usage with grounded or ungrounded thermocouples
• more stability with ambient temperature changes than with the 1794-IR8
and the 1794-IT8
Release of Series B version provides capability to work with grounded
thermocouples.
Use cold junction compensators 1794-CJC2 in thermocouple mode. Two cold
junction compensators are shipped with the 1794-IRT8.
The 1794-IRT8XT is the extended temperature version of the 1794-IRT8
module. The module is conformal coated.
Ambient Temperature °C
User Applied 24V DC Supply