Overview
The CAL Controls 3311 temperature controller is a compact, industrial-grade PID controller designed for precise temperature regulation in automation systems. This dual relay output model supports multiple sensor types including thermocouples (B, E, J, K, L, N, R, S, T) and RTD/Pt100 sensors, making it suitable for diverse process applications. With auto-tune capability and relay switching logic, the 3311 delivers reliable temperature control without complex programming.
Key Features
- Dual relay outputs for heating and cooling control
- Auto-tune PID that learns process dynamics and calculates optimal control parameters
- Support for 9 thermocouple types plus 2-wire RTD/Pt100 resistance thermometers
- Bright LED display with intuitive push-button operation
- Proportional, integral, and derivative control with selectable cycle times
- Compact 48 × 24 mm face-mounting design
- Multiple alarm modes for process protection and status indication
Technical Specifications
- Input Types: Thermocouple (B, E, J, K, L, N, R, S, T), RTD 2-wire Pt100
- Output Configuration: 2 × Relay (Form A/SPST, AgCdO contacts)
- Relay Ratings: 2A @ 250VAC resistive load
- Control Algorithm: PID with auto-tune and proportional band adjustment
- Operating Temperature: 0°C to 50°C ambient
- Proportional Cycle Time: 20 seconds (factory default, user adjustable)
- Display: LED with dual 3-digit readout
- Mounting: DIN sleeve (48 × 24 mm panel cutout)
- Series: CAL 3300
- Configuration: Pre-configured for plug-and-play operation
Typical Applications
- Plastic injection molding and extrusion temperature control
- Laboratory oven and furnace regulation
- Heating chamber and thermal processing equipment
- Industrial heating and cooling loop automation
- Machine tooling and manufacturing process temperature management
- Retrofit upgrades to older systems requiring relay-based control
Compatibility & Replacements
Compatible With
- Thermocouple and RTD sensor inputs (standard industrial types)
- Remote solid state relay (SSR) switching via 5Vdc output
- AC/DC power supplies (industrial control systems)
- PLC systems using relay or analog feedback monitoring
- Manual setpoint entry and LED display interface (no external software required)
Replaces / Drop-In Replacement For
- CAL 3300 (legacy models with dual relay configuration)
- CAL 9311 (9-series equivalent, where voltage matches)
- Similar 2-relay industrial temperature controllers requiring thermocouple or RTD input
Works With
- CAL charting and data logging software (optional RS-232/RS-485 communication module required)
- Solid state relay (SSR) modules via SSd output
- Miniature power relays and contactor control circuits
- Standard thermocouple and RTD wiring practices
- PLC monitoring via relay contact closure feedback
