Allen Bradley 1794-IT8 FLEX I/O Thermocouple Input Module

Introduction

The Allen Bradley 1794-IT8 is an analog input module from the FLEX I/O series, specifically designed for thermocouple temperature measurement in industrial automation systems. This module provides 8 thermocouple input channels with high-accuracy temperature sensing and supports multiple thermocouple types (J, K, T, E, R, S, B). Its modular design allows integration with FLEX I/O chassis for compact, flexible control panels and distributed I/O systems. The 1794-IT8 is ideal for applications where precise and reliable temperature data is critical for process control.

Technical Specifications

Applications

The 1794-IT8 module is used in diverse industrial applications requiring precise temperature measurement:

• Process Control Systems: Chemical, pharmaceutical, and food processing plants where temperature accuracy is critical.

• Industrial Furnaces and Ovens: Monitoring and controlling high-temperature processes.

• HVAC Systems: Measuring ambient and equipment temperatures for regulation.

• Energy & Power Plants: Temperature sensing for turbines, boilers, and heat exchangers.

• OEM Machines: Integrating temperature inputs into custom machinery and test equipment.

• Laboratory and R&D Facilities: Accurate temperature logging for experimental setups.

Advantages

• High Accuracy Thermocouple Measurement: ±0.25% typical accuracy ensures reliable process data.

• Supports Multiple Thermocouple Types: Flexibility to handle J, K, T, E, R, S, and B types in one module.

• Cold Junction Compensation Built-In: Maintains accuracy without additional devices.

• Compact & Modular Design: Fits easily in FLEX I/O chassis, saving panel space.

• Isolation for Signal Integrity: 1500 Vrms isolation reduces interference from other modules.

• Reliable in Industrial Environments: Rated for 0–60°C operation and wide humidity ranges.

• Integration with Studio 5000 & CompactLogix: Works seamlessly with Allen Bradley controllers and software for easy configuration.

Frequently Asked Questions (FAQs)

1. Q: Can the 1794-IT8 module handle multiple thermocouple types simultaneously?
   A: Yes, each channel can be individually configured for different thermocouple types.

2. Q: What is the maximum input voltage for thermocouples?
   A: Typical thermocouple inputs are millivolt range; module is designed for standard thermocouple outputs.

3. Q: Is cold junction compensation automatic?
   A: Yes, built-in cold junction compensation maintains measurement accuracy.

4. Q: Can this module be used in a distributed I/O setup?
   A: Yes, it integrates into FLEX I/O chassis for distributed control systems.

5. Q: Does the module provide isolation between channels?
   A: Yes, each channel is isolated 1500 Vrms from the backplane and other channels.

6. Q: What is the sampling rate of the module?
   A: 10 samples per second per channel.

7. Q: Can the module operate in high-humidity environments?
   A: Yes, it supports 5–95% non-condensing relative humidity.

8. Q: What is the temperature range for operation?
   A: 0°C to +60°C operating range; -40°C to +85°C for storage.

9. Q: Is it compatible with Studio 5000 Logix Designer?
   A: Yes, configuration and programming are done through Studio 5000.

10. Q: What is the module size and weight for panel layout?
    A: Dimensions: 90 mm × 35 mm × 90 mm; Weight: 0.28 kg (~0.62 lbs).

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