The Wavelength Electronics LFI-3551 is a precision temperature controller delivering ±5 A output current and 40 W power for demanding thermal management in laser and scientific systems. It maintains temperature stability better than ±0.002 °C across a -60°C to >+150°C control range using fast PID control with configurable proportional gains, integral time constants, and optional derivative tuning. A proprietary Smart Integrator circuit minimizes overshoot and accelerates settling time.
Technical Specifications
• Power Output: 40 W
• Current Output: ±5 A
• Voltage Output: 8 V
• Temperature Stability: Better than ±0.002 °C
• Temperature Control Range: -60°C to >+150°C
• Control Loop: Fast PID with four proportional gains, two integral time constants, and optional derivative time constant
– Key Features
• Smart Integrator circuit for reduced overshoot and improved settling performance
• Support for multiple sensor types: thermistors, AD590, LM335, and RTDs
• 3½ digit LED display for temperature setpoint, actual sensor temperature, auxiliary zone temperature, output current, limit current, and output voltage
• Adjustable temperature and current limit protection with front-panel trimpots
• Remote analog control: temperature setpoint, limit adjustment, and dual monitoring outputs (TE V and TE I)
• Status indicators for temperature limit, thermoelectric open/short, and sensor fault conditions
• Auxiliary sensor input for heatsink or ambient temperature monitoring
• 12 V fan output for thermoelectric heatsink cooling
• Open-drain ON/OFF and error status outputs
• 9-pin and 15-pin D-sub connectors with shielded covers
– Typical Applications
Laser diode temperature stabilization, scientific instrumentation, laboratory test systems, and precision industrial thermal management requiring sub-millidegree stability and remote control integration.
– Compatibility & Integration
Designed for interlock integration with LFI-3500 series temperature controllers and LFI-4500 series laser diode drivers. Compact benchtop and 19″ rack-mount configurations available.
