Specifications

Publication 1794-SG002D-EN-P - May 2012
46 Select FLEX I/O Modules
1794-IT8 Thermocouple/mV Input Module
The 1794-IT8 module is a temperature/mV measuring module that accepts
inputs from a variety of thermocouples and from the mV source in the range of
±76.5 mV. Choose the 1794-IT8 module when you need the following:
• A cost effective module.
• Applications that don't require high accuracy or high speed.
• Support for grounded or ungrounded thermocouples.
Use cold junction compensators (cat. no. 1794-CJC2) in thermocouple mode.
Two cold junction compensators are shipped with the 1794-IT8 module. This
module is suitable to work with grounded thermocouples, if certain guidelines
are followed. Refer to the module's user manual for more information.
The FLEX I/O cold junction compensator kit, containing two compensators, is
included with the 1794-IT8 module. You can order additional compensators
using the above catalog number.
Data format °C (implied decimal point XXX.X)
°F (implied decimal point XXX.X)
°K (implied decimal point XXX.X)
-32767…32767
0…65535
0…5000 (Ω mode) (implied decimal point XXX.X)
-4000…10000 (mV mode) (implied decimal point XXX.XX)
Overall drift with temperature,
max
Series A: 150 ppm/ °C of span
Series B: 50 ppm/ °C of span
Dimensions (HxWxD), approx 46 x 94 x 53 mm (1.8 x 3.7 x 2.1 in.)
94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.) installed
Temperature, operating 1794-IRT8: -20…55 °C (-4…131 °F)
1794-IRT8XT: -20…70 °C (-4…185 °F)
(1) For maximum throughput, short circuit all unused channels.
(2) Kit supplied with the module and contains 2 compensators.
Thermocouple/mV Input Module
Specification 1794-IT8
Input resolution 16 bits (2.384 μV typical)
Supported Thermocouple types Type B: 300…1800 °C (572…3272 °F)
Type C: 0…2315 °C (32…4199 °F)
Type E: -270…1000 °C (-454…1832 °F)
Type J: -210…1200 °C (-346…2192 °F)
Type K: -270…1372°C (-454…2502 °F)
Type N: -270…1300°C (-454…2372 °F)
Type R: -50…1768°C (-58…3214 °F)
Type S: -50…1768°C (-58…3214 °F)
Type T: -270…400°C (-454…752 °F)
Type TXK/XK (L): -200…800°C (-328…1472 °F)
Thermocouple/RTD Input Module
Specification 1794-IRT8 and 1794-IRT8XT