Description

The CLS208 is a compact, modular, and highly intuitive temperature and process controller manufactured by Watlow, a global leader in thermal system solutions. This controller is designed as a versatile and cost-effective solution for precise thermal management in a wide array of industrial applications. The CLS208 serves as the intelligent brain of a thermal system, accepting inputs from thermocouples, RTDs and other process sensors, executing sophisticated control algorithms like PID (Proportional, Integral, Derivative), and providing output signals to manage heating and cooling components such as solid-state relays (SSRs), contactors and valves. Its core value lies in delivering Watlow’s renowned precision and reliability in an accessible, user-friendly package that simplifies installation, configuration and operation.

As part of Watlow’s CLS series, the CLS208 is engineered for seamless integration into OEM equipment and industrial machines where space is at a premium but performance cannot be compromised. It features a bright, easy-to-read vacuum fluorescent display (VFD) and an intuitive navigation interface, allowing operators to easily view process values and adjust setpoints. The controller’s modular design, with optional plug-in communication cards, provides flexibility for future upgrades and connectivity needs. The CLS208 is strategically positioned to offer exceptional value by reducing machine design time, simplifying wiring, minimizing installation costs and ensuring consistent, repeatable thermal performance for critical processes, ultimately enhancing overall equipment effectiveness and product quality.

Technical Specifications

Main Features and Advantages

Superior control performance and ease of use: The CLS208 is equipped with advanced PID control algorithms with automatic tuning functionality. This feature automatically calculates the optimal P, I and D parameters for the thermal system, eliminating complex manual tuning and ensuring fast response to setpoint changes with minimal overshoot and exceptional stability. The bright vacuum fluorescent display provides excellent readability in various lighting conditions, showing the process variable (PV), setpoint (SP) and output percentage simultaneously. Intuitive front-panel navigation with a tactile feedback knob allows for easy configuration and operation, even while wearing gloves, making the CLS208 highly operator-friendly.

Flexibility and robust construction: A key advantage of the CLS208 is its modular design. It accepts optional plug-in communication modules, such as DeviceNet, PROFIBUS DP or Modbus RTU, enabling seamless integration into broader automation networks for centralized monitoring and control. This future-proofs the investment and adds significant connectivity value. The controller supports a wide range of input sensor types and output configurations, making it a versatile solution for diverse application needs without requiring different controller models. Housed in a compact, DIN rail-mountable enclosure, the CLS208 is built to withstand the electrical noise and vibrational challenges of industrial environments, ensuring long-term reliability and accurate performance where it matters most.

Application Field

The CLS208 is deployed across a vast spectrum of industries and applications where precise temperature control is critical to process quality and efficiency. In plastics manufacturing, it is extensively used to control barrel, nozzle and mold temperatures on injection molding machines, extruders and blow molders, ensuring product consistency and reducing scrap rates. In packaging machinery, the CLS208 manages heated seal bars, glue applicators and film lamination processes. Within the food and beverage industry, it finds application in process ovens, hot fill lines, sterilization units and brewing tanks, maintaining strict hygiene and quality control standards.

The controller is also widely utilized in semiconductor processing equipment, analytical instruments, and medical device manufacturing where precise thermal management is non-negotiable. In industrial HVAC systems, the CLS208 regulates heat exchangers, air handlers and fluid temperatures. Its versatility makes it ideal for any OEM machinery builder or end-user requiring a reliable, compact and feature-rich controller for heating, cooling or general process loop control, providing Watlow’s signature performance in a cost-effective and easy-to-implement package.

CLS208 WATLOW

Related Products

CLS204: A smaller, more basic version of the CLS series controller with a smaller display and fewer advanced features.

CLS203: A compact controller focused solely on temperature, often used for simpler applications.

EZ-ZONE ST: Watlow’s next-level series of controllers offering larger displays and more advanced communication and control capabilities.

F4T: Watlow’s flagship standalone controller with a large color touchscreen and extensive data logging capabilities.

PM Series Solid State Relays: Watlow’s SSRs are a common companion to the CLS208 for switching heating elements.

Watlow Sensors: A full range of compatible thermocouples, RTDs and thermistors for use with the CLS208.

COMM-DNET, COMM-DP, COMM-RTU: Optional plug-in communication modules for the CLS208 to enable DeviceNet, PROFIBUS DP and Modbus RTU connectivity respectively.