The Chromalox 200 Series is a single‑channel digital PID temperature regulator designed for critical industrial process heating and cooling applications. It combines PID control with Chromalox's SMART auto‑tuning algorithm that automatically calculates the optimal PID parameters for the connected thermal load, reducing commissioning time and eliminating guesswork. The built‑in fuzzy logic layer dynamically adjusts the control output based on the rate and direction of temperature change—not just the deviation from setpoint—providing smoother control than conventional PID alone, particularly in systems with irregular thermal loads. A configurable proportional band ranging from 1.0 to 200.0 % of the input span allows precise matching of the controller response to the thermal inertia of the process.

Flexible Input, Output, and Alarm Architecture

• Universal Input Compatibility: The 200 Series accepts both thermocouple and RTD sensor inputs, selectable through the front‑panel menu without hardware modification. A single controller model can serve across multiple process zones with different sensor types, reducing the variety of spare controllers that need to be stocked.
• Selectable Control Output Modes: The controller can be configured for a single control output (either heating or cooling) or dual control outputs (both heating and cooling). In dual‑output mode, a single 200 Series controller manages both sides of a thermal process—such as a molding line that requires both heating and active cooling—without the need for a second controller.
• Dual Alarm Protection: Two independent alarm outputs can be configured for high limit, low limit, or deviation alarm modes. These alarms provide a critical safety layer: if the process temperature exceeds the alarm threshold, the controller can activate external relays to cut power to the heating elements, trigger audible or visual alarms, or send alarm signals to a PLC or SCADA via the digital communication interface. This dual‑alarm architecture enables both a pre‑warning threshold to alert the operator and a higher‑level trip threshold to disconnect the load automatically.

NEMA 4X Front Panel and Environmental Resilience

• NEMA 4X (IP66 Equivalent) Protection: The front panel meets NEMA 4X standards, providing complete protection against dust ingress, hose‑directed water, and corrosion. This makes the 200 Series suitable for installation in washdown environments—food and beverage processing plants, pharmaceutical cleanrooms, outdoor enclosures—where standard IP65 controllers may not provide adequate long‑term protection.
• 1/16 DIN Panel Mount Form Factor: The standard 48×48 mm (1/16 DIN) panel cut‑out allows the 200 Series to fit into space‑constrained control cabinets alongside contactors, circuit breakers, and PLCs. The compact form factor is particularly valuable for OEM equipment builders who need to minimize control panel dimensions.
• Wide‑Range Power Rating: The series supports control outputs up to 1,200 W, making it suitable for direct switching of small to medium‑sized resistive heating loads without requiring an external power controller or SSR. For larger loads beyond 1,200 W, the controller can drive an external solid‑state relay or contactor via its control output signal.

Digital Communication and System Integration

• RS‑485 Digital Communication: The built‑in RS‑485 interface enables direct integration with PLCs, SCADA systems, and Chromalox supervisory software. Process values, setpoints, alarm states, and PID parameters can be read and written remotely, enabling centralized monitoring and control of multiple 200 Series controllers distributed across a facility.
• PC Configuration Software: A dedicated PC software tool allows offline parameter configuration, data logging, and trend analysis. Configuration files can be saved and cloned across multiple controllers, reducing commissioning time in multi‑zone applications. The software also supports firmware updates and diagnostic data retrieval for preventive maintenance planning.
• Certifications for Global Deployment: The 200 Series carries UL, cUL, and FM certifications, meeting the safety and performance standards required for installation in North American industrial environments. These certifications simplify OEM equipment certification and end‑user regulatory compliance.

Applications

• Plastics extrusion and injection molding barrel and die zone temperature control
• Industrial furnaces and ovens for heat treatment, curing, and annealing
• Packaging machinery: heat sealing, blister forming, shrink‑wrap tunnels
• Food and beverage processing: ovens, fryers, pasteurizers, retort systems
• Chemical and pharmaceutical reactor heating jacket temperature control
• Any industrial process heating application requiring single‑channel PID control with NEMA 4X front panel protection