Product Overview

The B&R X20cAT4222 (X20c AT 4222) is a high-precision, coated temperature input module from the B&R X20 system, designed for reliable operation in harsh industrial environments. Featuring 4 inputs for resistance temperature measurement, this module supports PT100 and PT1000 sensors and is optimized for 3-wire connection configurations. The "c" designation indicates that the electronics are protected by a conformal coating, providing superior resistance against condensation and corrosive gases, making it ideal for chemical processing, outdoor infrastructure, or humid production facilities. It delivers consistent data fidelity with a resolution of 0.1 deg C, helping to minimize thermal measurement errors in critical closed-loop control applications.

Technical Configuration

The module architecture is built on a 16-bit sigma-delta converter, ensuring high accuracy and low noise performance across all four channels. Each channel is independently configurable for sensor type, allowing for flexible integration of mixed PT100/PT1000 sensor arrays within a single module. The X20cAT4222 supports a wide range of resistance measurements (0.1 to 4500 Ohm for PT100/PT1000) and includes a configurable input filter (1 ms to 66.7 ms) to mitigate industrial noise. Diagnostics are managed through integrated status LEDs and software feedback, providing immediate alerts for open-circuit faults or measurement range overshoots.

Technical Specifications

FAQs

What is the benefit of the "coated" designation in X20cAT4222?

The conformal coating on the internal electronics protects the module from high humidity, condensation, and corrosive industrial gases. This significantly extends the operational lifespan of the module in challenging environments where standard modules might succumb to oxidation or short circuits.

Can this module measure resistance directly?

Yes, the module is capable of direct resistance measurement. It provides an output format of INT or UINT and supports resistance ranges from 0.1 to 4500 Ohm (for G=1) or 0.05 to 2250 Ohm (for G=2).

Is the terminal block included with the module?

No, the X20TB12 terminal block and the X20cBM11 bus module are required accessories and must be ordered separately.

Installation and Operational Guidelines

• Wiring Standards: For 3-wire connections, ensure that the resistance of the three wires is as balanced as possible to allow the module to effectively compensate for lead-wire resistance errors. Use shielded twisted-pair cabling and terminate shields according to established EMC guidelines to maintain measurement precision.
• Thermal Management: When installing the module, note that horizontal mounting is rated up to 60 deg C, while vertical mounting is restricted to 50 deg C. If the installation environment exceeds 2000 m in elevation, apply a temperature derating of 0.5 deg C per 100 m to ensure the safety and accuracy of the analog conversion stage.
• Environmental Protection: While the conformal coating offers robust protection against atmospheric conditions, avoid exposing the module directly to liquid chemicals or submersion. Ensure the module is installed in a properly rated IP-enclosure to maintain the overall system's degree of protection per EN 60529.