At your request, an external water sensor can be connected to the control unit of the BRUNE humidifier B 500 and B 600. This is placed underneath the appliance (recommended in combination with the safety drip tray) and reacts immediately in the event of uncontrolled water leakage from the appliance. The appliance stops immediately and you are notified of the water leakage by both an acoustic signal and an error message on the display. We recommend using the safety water sensor for appliances with an automatic water supply without a flushing device.