HL 356 Demo Unit, Gas Burner

1 front panel with circuit diagram and laboratory sockets,  2 operating displays, 3 burner,  4 "fault elimination" button,  5 flame simulation,  6 potentiometer for thermostat temperature,  7 temperature display,  8 heater emergency switch,  9 reset button for temperature limiter,  10 potentiometer for vessel water temperature,  11 temperature display,  12 fault switch box