Menu Item: „Calibrate“ Calibration When SEARCH (lower point) is activated, evacuation is to the lower point. If the pressure does not fall any further, the pressure value can be entered by using a comparison measurement device and confirmed with OK. For the upper point the same is valid. The ambient barometric pressure is entered. Do not confirm until the value has been established. If the controller is integrated in a complete system or pump system (LVS), evacuation and venting take place automatically when the stated buttons are pressed. The calculated correction values are displayed and can be stored with Save. Ensure that the set pressure is also present at the sensor. Lower point Upper point at low pressure - pressure of comparison meas- urement device (at lowest possible pressure, e.g. 10 mbar) at normal pressure (high) - barometric pressure