BUCHI Vacuum Controller V-855 - Manual (Page 40)

6 Operation
40 V-850/855 Operation Manual, Version E
6 .8 Calibrating the pressure sensor
In the Extra menu, select Calibr . pressure sensor. Now press the Forward button, the following
screen appears:
You can now calibrate the pressure sensor:
NOTE
The pressure sensor is precalibrated by the manufacturer before the system is shipped to the
customer. You can adjust this calibration to your working conditions by means of a reference
measuring device.
6 .8 .1 Offset calibration
An offset calibration has to be carried out when the pressure value indicated by the Controller does
not correspond to the reading on your reference pressure measuring device. The difference between
these values is the offset.
To carry out an offset calibration of the pressure sensor, select Calibr. pressure offset. The following
screen appears:
Use the selection knob on the vacuum controller to define the offset and the reference pressure for the
offset calibration. Turn the knob to the right to increase the value or to the left to decrease the value
and confirm your settings with
OK. You will get back to the main screen.