Watson-Marlow Qdos30 Universal - Manual (Page 53)

Watson-Marlow qdos30 Universal and Universal+ Pump User Manual 53
If you need to adjust the volume of fluid in the tank, for example when re-filling,
then press SELECT when the bar highlights the Adjust level option.
You can now use the +/- keys to adjust the level of fluid in the tank.
The accuracy of the fluid level monitor will improve with regular calibration of the
pump.