RTD Temperature Input Module | 1771-IR | Allen-Bradley | Supports 6 Sensors

Overview
The Allen-Bradley 1771-IR is a high-precision RTD Input Module designed for accurate temperature measurement and resistance monitoring within 1771 I/O chassis systems. It supports multiple sensor types and provides reliable performance across a wide temperature range, making it ideal for industrial temperature control applications.

Key Features

• Model Number: 1771-IR

• Manufacturer: Allen-Bradley

• Product Type: RTD Input Module

• Number of Inputs: 6 RTD input channels

• Module Location: 1771 I/O chassis

• Sensor Types Supported:

• 100 Ω platinum (α = 0.00385)

• 10 Ω copper (α = 0.00386)

• Other RTDs (resistance readings only)

• Units of Measurement:

• Temperature: °C or °F

• Resistance: Ohms (10 mΩ or 30 mΩ resolution)

Performance Specifications

• Temperature Range:

• Platinum RTD: -200°C to +870°C (-328°F to +1598°F)

• Copper RTD: -200°C to +260°C (-328°F to +500°F)

• Resistance Range: 1.00 to 600.00 Ω

• Resolution:

• Platinum RTD: 0.1°C (0.1°F)

• Copper RTD: 0.3°C (0.5°F)

• Sensor Excitation Current: 1 mA constant current per channel

• Common Mode Impedance: >10 MΩ

• Input Overvoltage Protection: 120V RMS continuous

• Power Dissipation: 4.75 W (maximum)

• Thermal Dissipation: 16.2 BTU/hr

• Temperature Coefficient: +50 ppm/°C of full-scale range

Applications
The 1771-IR module is commonly used in process control, manufacturing, and industrial automation systems that demand accurate, multi-channel temperature monitoring. Its compatibility with both platinum and copper RTDs makes it versatile for a variety of sensing environments, including furnaces, reactors, and machine temperature feedback loops.

FAQs
Q: What sensors can be used with the 1771-IR module?
A: The module supports 100 Ω platinum and 10 Ω copper RTDs as standard, and can display readings in ohms for other RTD types.

Q: What is the maximum input resistance supported by the 1771-IR?
A: The 1771-IR can measure resistance up to 600 Ω, making it suitable for a wide range of RTD applications.

Q: How accurate is the 1771-IR in temperature measurement?
A: The module provides resolution down to 0.1°C for platinum sensors and 0.3°C for copper sensors, ensuring precise readings for critical processes.