Model 5R7-350/347 is designed to operate with a thermoelectric (Peltier effect) module that can be operated in cooling or heating mode, depending on current direction. The thermal controller is designed with a proportional/integral control algorithm. A choice of fixed or adjustable proportional bandwidth and integral rate permits optimizing individual thermal systems. Additional external heat sinking permits operating load currents in excess of 10 A. The thermal controllers are offered in both an open-board construction or encapsulated on a mounting plate.