Resetting H2O Sensor Service Hours for the MBraun Touchpanel (monochrom)

After completing the analyser cleaning, the service hours for the analyser need to be reset.
Display the screen H2O or O2 Status:

H2O sensor timer reset

Press or Button so often, until status level (ST) will appear
Press F4 or  so often, until the desired display will appear.

Press F3 Reset operation hours

O2 sensor timer reset