The Beckhoff KL3222 Bus Terminal is a versatile and high-precision analogue input module designed for temperature measurement with RTD sensors. Featuring two independent input channels, it offers engineers a reliable solution for monitoring and controlling temperature in diverse automation and process applications.

Supporting a wide range of sensor types, the KL3222 is compatible with Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni1000, and KTY sensors, making it highly adaptable for both legacy and modern installations. Beyond RTDs, it can also handle resistance measurement tasks, such as potentiometers in the 10 Ω to 1.2/5 kΩ range, extending its functionality beyond temperature monitoring. This flexibility makes the KL3222 suitable for complex automation systems that require both temperature and resistance acquisition within a single module.

The module achieves accurate measurement across broad ranges, covering –200…+850°C for Pt sensors, –60…+250°C for Ni sensors, and a dedicated –200…+320°C high-precision range for applications where exact thermal control is paramount. These wide ranges ensure the KL3222 can be deployed in everything from cryogenic processes to high-temperature industrial operations.

Its 16-bit resolution ensures fine detail in temperature measurement, allowing the system to detect even subtle variations. Combined with a typical conversion time of 50 ms, the KL3222 delivers stable and reliable readings suitable for real-time process monitoring while balancing speed and accuracy. The use of 4-wire connection technology minimises the influence of lead resistance, a critical factor in ensuring measurement reliability, particularly in environments with long sensor cable runs.

Powered through the K-bus, the KL3222 integrates seamlessly into Beckhoff’s Bus Terminal system, offering modular scalability. This design allows engineers to expand I/O capacity easily by combining the KL3222 with other analogue, digital, or specialty terminals, building custom-tailored automation solutions. Its compact form factor and modular architecture reduce cabinet space requirements while supporting a flexible, distributed approach to I/O management.

The KL3222 is well suited to industries where temperature monitoring is critical, including process automation, energy systems, food and beverage, pharmaceuticals, chemical processing, and laboratory environments. It ensures accurate control of heating, cooling, and environmental stability, supporting both safety and efficiency in production.

In summary, the Beckhoff KL3222 Bus Terminal provides a robust, precise, and versatile solution for RTD-based temperature measurement and resistance acquisition. With its dual-channel design, broad sensor compatibility, high-precision measurement ranges, and reliable 4-wire technology, it delivers dependable performance in demanding automation environments while integrating seamlessly into the Beckhoff Bus Terminal system.