Estro microprocessor-operated flame-controlling device is equipped with inputs and outputs for the ignition and control of industrial burners. Estro B is designed for pilot-ignited burners while Estro C is designed for direct-spark-ignited burners. Either may be remote controlled. An EXP-1 card may be added to control burners equipped with an air damper, blower and pressure switch. The front panel includes a lockout/reset button, cycle display and flame-signal indicator.