1794-IT8 | Allen-Bradley 8-Channel Thermocouple Input Module

Product Description

The 1794-IT8 is a high-precision thermocouple input module from Allen-Bradley’s FLEX I/O series, offering reliable temperature measurement for industrial control systems. It supports up to 8 thermocouple channels and is designed for integration with 1794-TB2, -TB3, and -TB3T terminal bases. The module provides robust protection, accurate signal conversion, and industrial-grade durability for demanding environments.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model Number: 1794-IT8

• Product Type: Thermocouple Input Module

• Number of Inputs: 8 channels

• Compatible Terminal Bases: 1794-TB2, -TB3, -TB3T

• Nominal Input Voltage Range: -76.5 to +76.5 mV

• Resolution: 16 bits (2.384 µV typical)

• Indicators: 1 red/green power status LED

• Flexbus Current: 20 mA

• Power Dissipation: 3 W maximum @ 31.2 VDC

• Thermal Dissipation: 10.2 BTU/hour maximum @ 31.2 VDC

• Keyswitch Position: 3

• Isolation Voltage: Tested 850 VDC for 1 s (inputs and user power to logic)

• Data Format: 16-bit 2’s complement or offset binary (unipolar)

• Channel Bandwidth: 0–2.62 Hz (-3 dB)

• Operating Humidity: 5–95% non-condensing, IEC 60068-2-30

• Vibration Resistance: 5 g @ 10–500 Hz, IEC 60068-2-6

• Dimensions (L×W×H): 5.33 × 9.4 × 4.57 cm

• Weight: 2 kg

Key Features

• High Accuracy: 16-bit resolution ensures precise thermocouple readings.

• Compact Form Factor: Small footprint for easy integration into FLEX I/O systems.

• Visual Status: Red/green LED for power and module activity monitoring.

• Industrial Durability: Tested for vibration, temperature, and isolation withstand.

• Flexible Data Output: Supports 2’s complement and offset binary formats.

• Easy Installation: Mounts on standard FLEX I/O terminal bases.

Applications

• Process temperature monitoring in manufacturing and chemical plants

• Integration in distributed FLEX I/O control systems

• HVAC and environmental control requiring precise temperature input

• Industrial automation requiring multiple thermocouple channels

FAQ

• Q: How many thermocouple inputs does 1794-IT8 support?
  A: The module provides 8 independent channels for temperature measurement.

• Q: What is the isolation capability?
  A: Inputs and user power are tested to withstand 850 VDC for 1 second.