Overview
The CAL Controls 3311 is a compact, full-featured PID temperature controller designed for precision process control in industrial automation. This 1/32 DIN (48 × 24 mm) unit delivers reliable temperature regulation with a built-in autotune function that automatically calculates optimal PID parameters for your specific application. The 3311 variant offers dual relay outputs, making it ideal for heating/cooling circuits, alarm functions, or secondary setpoint control.
Key Features
- PID Autotune: Automatically characterizes thermal response and calculates optimum PID values for stable control without manual tuning
- Flexible Sensor Input: Accepts 9 types of thermocouples (B, E, J, K, L, N, R, S, T) or RTD/Pt100 2-wire resistance thermometers
- Dual Relay Outputs: Two independent relay contacts for heating, cooling, or secondary setpoint (SP2) alarm annunciation
- Ramp/Soak Programming: Controlled warm-up with selectable soak time for precision temperature ramping
- Compact DIN Form Factor: Ultra-compact 1/32 DIN panel mount design fits tight control enclosures
- Setpoint Lock: Selectable password protection prevents unauthorized temperature adjustments
Technical Specifications
- Display Type: LED, selectable resolution
- Input Range: Thermocouple (B, E, J, K, L, N, R, S, T) or RTD/Pt100
- Operating Temperature: 0–50°C ambient
- Output Type: Dual relay contacts (2A @ 250VAC)
- Control Mode: ON/OFF or proportional with selectable cycle time
- Panel Mount: 1/32 DIN (48 × 24 mm)
- Certifications: IP65/NEMA 4X sealed front fascia
- Power Supply: 24VDC or 115/230VAC (model dependent)
- Communication: RS232/RS485 optional (verify model code)
Typical Applications
- Plastic injection molding barrel and nozzle heating control
- Oven and furnace temperature management
- Extrusion die and tool temperature control
- Laboratory and test chamber environment conditioning
- Heat treatment process control (carburizing, annealing)
- Food processing and cooking equipment temperature regulation
- Packaging machinery thermal management
Compatibility & Replacements
Compatible With
- 9-type thermocouple inputs (J, K, T, E, N, B, S, R, L)
- RTD/Pt100 2-wire resistance thermometers
- Solid-state relays (SSR) and electromechanical relay loads up to 2A
- Standard 24VDC or 120/240VAC panel power supplies
- PLC analog input modules with 4–20mA output (with optional transmitter)
Replaces / Drop-In Replacement For
- CAL Controls 3310 (single setpoint, single relay variant)
- Earlier CAL 3200 series controllers requiring dual relay outputs
- Generic compact PID temperature controllers in 1/32 DIN package
Works With
- Industrial PLCs and motion controllers via analog feedback or optional RS485 interface
- Distributed I/O systems and soft-start drives
- Legacy and modern HVAC/building management systems
- Process control software (via optional Modbus RTU or analog signal conditioning)
