The Allen-Bradley 1794-IRT8 is a high-performance Thermocouple/RTD Input Module designed for the Flex I/O platform, delivering reliable temperature measurement in demanding automation applications. This module provides 8 individually isolated input channels, each configurable for either thermocouple or RTD sensors, ensuring flexibility across diverse process control scenarios. With built-in cold junction compensation and programmable filtering, the 1794-IRT8 achieves exceptional accuracy (typically ±0.5°C for thermocouples and ±0.1°C for RTDs) while minimizing noise interference. It supports a wide range of sensor types, including common thermocouples (J, K, T, E, N, R, S, B) and 100-ohm platinum RTDs (PT100), making it suitable for temperature monitoring in chemical plants, refineries, and manufacturing lines. The module communicates via the Flex I/O backplane, offering fast data updates and compatibility with Allen-Bradley controllers. Its robust construction withstands industrial shock, vibration, and temperature extremes, ensuring long-term stability. Below is the detailed technical specification table for the 1794-IRT8 module.
| Parameter |
Specification |
| Product Type |
Thermocouple/RTD Input Module |
| Model |
1794-IRT8 |
| Number of Inputs |
8 isolated channels |
| Input Type |
Thermocouple (J, K, T, E, N, R, S, B) or RTD (100-ohm Platinum PT100) |
| Input Range (Thermocouple) |
J: -210 to 1200°C; K: -270 to 1372°C; T: -270 to 400°C; E: -270 to 1000°C; N: -270 to 1300°C; R: -50 to 1768°C; S: -50 to 1768°C; B: 0 to 1820°C |
| Input Range (RTD) |
-200°C to 850°C (PT100) |
| Accuracy (Thermocouple) |
±0.5°C typical at 25°C ambient (J, K, T, E); ±1.0°C for R, S, B |
| Accuracy (RTD) |
±0.1°C typical at 25°C ambient |
| Cold Junction Compensation |
Internal, ±0.5°C accuracy |
| Input Impedance |
>10 MΩ (thermocouple mode) |
| Isolation |
500V DC channel-to-channel and channel-to-backplane |
| Update Rate |
100 ms per channel (typical) |
| Resolution |
16-bit |
| Common Mode Rejection |
120 dB at 50/60 Hz |
| Normal Mode Rejection |
60 dB at 50/60 Hz |
| Power Consumption |
5V DC: 150 mA typical; 24V DC: 100 mA typical (from backplane) |
| Operating Temperature |
-20°C to +70°C |
| Storage Temperature |
-40°C to +85°C |
| Relative Humidity |
5% to 95% non-condensing |
| Vibration Resistance |
5 g Standard Models 10-500 Hz (operating) |
| Shock Resistance |
30 g (operating) |
| Backplane Current |
150 mA Standard Models 5V DC (max) |
| Field Wiring |
Removable terminal block (18-22 AWG) |
| Certifications |
UL, CE, CSA, ATEX (Zone 2) – pending for specific models |
| Weight |
Approx. 0.3 kg (0.66 lbs) |
| Dimensions (H x W x D) |
94 mm x 45 mm x 75 mm (3.7 in x 1.77 in x 2.95 in) |
| Compatibility |
Flex I/O adapter modules (e.g., 1794-AENT, 1794-ASB) |
| Warranty |
1 year (standard) |
What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
Original and fast!
2020/02/22