Available from Oven Industries, the 5R7-570(A) RoHS-compliant, open-board electronic temperature controller is designed with a proportional integral control algorithm to provide precise control to thermoelectric modules. The H-bridge temperature control eases the transition between heating and cooling, eliminating dead spots. Green LED for heat and blue LED for cooling indicate the mode, while simultaneous illumination indicates the load circuit is off due to an open sensor. Pulse width modulation controls the power level in the thermoelectric module at a base frequency of 1 kHz. Power resolution is one of ±250 steps in the load circuit control. The temperature controller offers input voltage ranging from 6 to 28 VDC, output voltage ranging from 0 to 36 VDC, load current ranging from 0.1 to 12.5 amps, and output power control of 450 W. The compact controller measures 1.75" × 3.5" × 3". The unit is PC-programmable and can be set up via operator interface or a serial link GUI. It is equipped with an RS-232 communication port and non-volatile memory.